What we’re looking for

We’re looking for a Backend Engineer to join the Wolt AdTech & Promotions team.

This role is best suited for someone who is strongly backend-oriented, thrives in ambiguity, and can take ownership of large, cross-functional initiatives from planning to delivery.

You might be a great fit if you

• Are a strong backend engineer, ideally with Golang experience
• Have experience building and operating scalable backend systems
• Are comfortable working in high-ambiguity environments and bringing structure where needed
• Can independently lead large initiatives across team boundaries, from problem definition and planning to stakeholder alignment and on-time delivery
• Communicate clearly and effectively, and know how to gather, process, and act on feedback
• Can build strong working relationships with stakeholders and keep multiple parties aligned around shared goals
• Have hands-on experience with AI-assisted engineering workflows, including tools like Codex, Claude, and agent-based development approaches
  
• Bring experience with NoSQL databases such as Cassandra, MongoDB, or similar technologies

Requirements

• Backend engineering experience
• Strong preference for Golang
  
• Proven ability to take ownership of complex, cross-team projects in ambiguous environments
• Strong stakeholder management, planning, and delivery skills
• Excellent communication and alignment-building skills
• Extensive experience with AI-assisted development, including tools such as Codex, Claude, and agentic workflows
• Experience with NoSQL databases such as Cassandra, MongoDB, or similar is a plus

DRW is a diversified trading firm with over 3 decades of experience bringing sophisticated technology and exceptional people together to operate in markets around the world. We value autonomy and the ability to quickly pivot to capture opportunities, so we operate using our own capital and trading at our own risk.

Headquartered in Chicago with offices throughout the U.S., Canada, Europe, and Asia, we trade a variety of asset classes including Fixed Income, ETFs, Equities, FX, Commodities and Energy across all major global markets. We have also leveraged our expertise and technology to expand into three non-traditional strategies: real estate, venture capital and cryptoassets.

We operate with respect, curiosity and open minds. The people who thrive here share our belief that it’s not just what we do that matters–it's how we do it. DRW is a place of high expectations, integrity, innovation and a willingness to challenge consensus.

As a Senior Software Engineer on our Platform Data - Integration team, you will play an integral role in building systems and tools that allow users to discover and share data across the DRW organization. You will work alongside individual Traders, Quantitative Researchers, and Back-Office personnel to best utilize the firm’s data and platform tools. 

What you will do in this role: 

• Design and deliver software services and data tools that expand the data delivery capabilities of DRW’s Data Platform. 

• Define architectural patterns, standards, and technology decisions for the team. Apply these decisions to new solutions, as well as to evolve legacy systems. 

• Collaborate with teams across the organization to enable standardized data access. 

• Apply platform thinking to solve problems in a repeatable way at scale with standard 3rd party, open source, and in-house toolsets. 

• Develop AI workflows to improve team processes and accelerate feature delivery. 

What you will need in this role: 

• 8+ years of experience designing, developing, and delivering data-heavy software services. 

• Excellent written and verbal communication skills. 

• Proven ability to work in a collaborative, agile, and fast-paced environment, prioritizing multiple tasks and projects, and efficiently handle the demands of a trading environment. 

• Strong technical problem-solving skills. 

• Comfort working within a globally distributed team. 

• Expertise in Python, Java, or C#. 

• Expertise in multiple programming paradigms, design patterns, and refactoring. 

• Experience with multiple data storage technologies (e.g. RDBMS, NoSQL, Cassandra, Kafka, etc.) and knowledge of their associated trade-offs. 

• Experience designing software in multiple architectural styles (e.g. Service-Oriented, Event-Driven, Monolithic, etc.). 

• Experience building distributed systems which include load balancing, horizontal scaling, and data processing. 

• Experience confidently discussing tradeoffs between different technology and architectural choices and driving them to consensus. 

• Experience with multiple data formats and serialization systems (e.g. Protobuf/gRPC, Avro, Thrift, JSON, etc.). 

• Experience owning products end-to-end, from requirements through operations. 

• Experience responding to, managing, and resolving incidents. 

• Experience managing and observing workloads in a Kubernetes environment. 

• Experience mentoring junior software engineers. 

For more information about DRW's processing activities and our use of job applicants' data, please view our Privacy Notice at https://drw.com/privacy-notice.

California residents, please review the California Privacy Notice for information about certain legal rights at https://drw.com/california-privacy-notice.

[#LI-KS1] 

DRW is a diversified trading firm with over 3 decades of experience bringing sophisticated technology and exceptional people together to operate in markets around the world. We value autonomy and the ability to quickly pivot to capture opportunities, so we operate using our own capital and trading at our own risk.

Headquartered in Chicago with offices throughout the U.S., Canada, Europe, and Asia, we trade a variety of asset classes including Fixed Income, ETFs, Equities, FX, Commodities and Energy across all major global markets. We have also leveraged our expertise and technology to expand into three non-traditional strategies: real estate, venture capital and cryptoassets.

We operate with respect, curiosity and open minds. The people who thrive here share our belief that it’s not just what we do that matters–it's how we do it. DRW is a place of high expectations, integrity, innovation and a willingness to challenge consensus.

As a Senior Data Engineer on our Data Experience team, you will play an integral role in bringing vendor datasets into our data platform, governing our centralized data pipelines, consolidating data delivery infrastructure across disparate systems, and working alongside individual Traders, Quantitative Researchers, and Back-Office personnel to best utilize the firm’s data and platform tools.

Technical requirements summary:

• Have extensive experience designing and building data pipelines
• Have experience working within modern batch and streaming data ecosystems
• An expert in SQL and Java or Python
• Extensive knowledge of data modeling techniques
• Able to own the delivery of data products, working with analysts and stakeholders to understand requirements and implement solutions
• Able to contribute to project management and project reporting
• Have experience driving nontrivial data migrations across platforms
• Able to establish, follow, and enforce data modeling standards across a large ecosystem.

What you will do in this role:

• Model, build, and manage data products built atop DRW’s Unified Data Platform.
• Work closely with Data Strategists to determine appropriate data sources and implement processes that onboard and manage new datasets for trading, research, and back-office purposes.
• Design data governance processes that enable discovery, cost-sharing, usage tracking, access controls, and quality control of datasets to address the needs of DRW trading teams and strategies.
• Continually monitor data ingestion pipelines and data quality to ensure stability, reliability, and quality of the data. Design monitoring and quality control software and processes.
• Own the technical aspects of vendor ingestion pipelines, coordinating with vendor relationship managers on upcoming changes, performing routine data operations without breaking internal users, and contributing to the team’s on-call rotation to respond to unanticipated changes.
• Rapidly respond to user requests, identifying platform gaps, and self-service opportunities that make the user experience more efficient.

What you will need in this role:

• 7+ years of experience working with modern data technologies and building data-first products.
• Excellent written and verbal communication skills.
• Proven ability to work in a collaborative, agile, and fast-paced environment, prioritizing multiple tasks and projects, and efficiently handle the demands of a trading environment.
• Proven ability to deliver rapid results within processes that span multiple stakeholders.
• Strong technical problem-solving skills.
• Extensive familiarity with SQL and Java or Python, with a proven ability to develop and deliver maintainable data transformations for production data pipelines.
• Experience leveraging data modeling techniques and ability to articulate the trade-offs of different approaches.
• Experience with one or more data processing technologies (e.g. Flink, Spark, Polars, Dask, etc.).
• Experience with multiple data storage technologies (e.g. S3, RDBMS, NoSQL, Delta/Iceberg, Cassandra, Clickhouse, Kafka, etc.) and knowledge of their associated trade-offs.
• Experience with multiple data formats and serialization systems (e.g. Arrow, Parquet, Protobuf/gRPC, Avro, Thrift, JSON, etc.).
• Experience managing data pipeline orchestration systems (e.g. Kubernetes, Argo Workflows, Airflow, Prefect, Dagster, etc.), delving deeply into low-level details.
• Proven experience in managing the operational aspects of large data pipelines such as backfilling datasets, rerunning batch jobs, monitoring event throughput, and handling dead-letter queues.
• Prior experience triaging data quality control processes, correcting data gaps and inaccuracies.

For more information about DRW's processing activities and our use of job applicants' data, please view our Privacy Notice at https://drw.com/privacy-notice.

California residents, please review the California Privacy Notice for information about certain legal rights at https://drw.com/california-privacy-notice.

[#LI-TL1] 

What You’ll Work On

As a member of the App Platform team you get to play a few different roles:

Architect: We are the ones that know how our large system should fit together.

Developer: We write lots of code. Some is purely for prototyping and what passes the prototyping phase is made ready for production and used by nearly all server teams.

Consultant: We work closely with all the server teams to understand their needs and lend assistance with the infrastructure we have built.

Leader: We need to be vocal about our experiences to internal teams as well as the outside world through blog posts, presentations and open source contributions.

Requirements

• 5+ years of experience as a software engineer
• Strong Java knowledge
• Experience working with high traffic, scalable web applications
• Solid understanding of data structures, algorithms and framework internals
• Ability to speak and write clearly and concisely
• Ability to think creatively about solutions with a focus on the long term stability of our system.
  
  

Nice-to-Have

• Experience with SOA
• Experience with at least one relational database (e.g. MySQL) and one NoSQL database (e.g. Cassandra)
• Familiarity with asynchronous messaging systems, such as Kafka and ActiveMQ
• DevOps experience

#IND2020

#CB2019

#LI2019

#NAUKRI19

What You’ll Work On

As a member of the App Platform team you get to play a few different roles:

Architect: We are the ones that know how our large system should fit together.

Developer: We write lots of code. Some is purely for prototyping and what passes the prototyping phase is made ready for production and used by nearly all server teams.

Consultant: We work closely with all the server teams to understand their needs and lend assistance with the infrastructure we have built.

Leader: We need to be vocal about our experiences to internal teams as well as the outside world through blog posts, presentations and open source contributions.

Requirements

• 5+ years of experience as a software engineer
• Strong Java knowledge
• Experience working with high traffic, scalable web applications
• Solid understanding of data structures, algorithms and framework internals
• Ability to speak and write clearly and concisely
• Ability to think creatively about solutions with a focus on the long term stability of our system.
  
  

Nice-to-Have

• Experience with SOA
• Experience with at least one relational database (e.g. MySQL) and one NoSQL database (e.g. Cassandra)
• Familiarity with asynchronous messaging systems, such as Kafka and ActiveMQ
• DevOps experience

#IND2020

#CB2019

#LI2019

#NAUKRI19

Please note that these positions are based in London, Berlin, or Paris — relocation support is provided if required.

THE BEST WORK OF YOUR CAREER

Trade Republic is the largest savings platform in Europe — we operate in 18 countries, serving +10 million customers who trust us with over €150B in assets. But we're striving for more.

We have a bold mission to empower everyone to build wealth with easy, safe, and free access to financial systems. You will have the opportunity to grow your career by collaborating with a team of outstanding talents and state of the art technology to build a lasting, positive future for millions.

ABOUT PLATFORM ENGINEERING

Platform Engineering is the backbone of Trade Republic's engineering velocity. Our mission is to build scalable platforms for a Europe-scale bank — serving internal engineers, and building in-house control planes for managing the bank's infrastructure. We’re a ~50-person Platform team focused on one thing: enabling product engineers to move fast and operate autonomously by default.

We build self-service platforms, golden paths, and opinionated tooling so that over 300 engineers can ship with confidence. From Kubernetes fleet management and CI/CD to an internal Developer Hub built on Backstage, our work underpins every trade, savings plan, and card payment that flows through the platform.

WHAT YOU'LL BE DOING

Our database platform is foundational to how Trade Republic works — every trade, savings plan, and card payment touches it. As Database Platform Tech Lead, you will set the direction, own the outcomes, and guide the team building the platform layer that makes database operations self-service, automated, and reliable at scale.

• Set the database reliability standard: Architect the failover mechanisms, replication topology, and recovery strategies that meet our availability targets — and own the engineering roadmap that closes the gap between where we are and the number of 9s the business requires.
• Drive toward zero-touch operations: Define what fully automated database operations look like — provisioning and scaling to zero-downtime migrations — and lead the platform work that gets us there.
• Own the database technology strategy: Define which database technology fits which problem — set the criteria for adoption, govern the portfolio, and ensure every database choice is intentional and operated with the same level of rigour.
• Define the database contract with product teams: Set the standards for how product engineers interact with databases — schema governance, migration patterns, connection pooling, query performance — and build the tooling that makes it effortless to get right.
• Own the platform end to end: Set the operational bar — define on-call practices and incident response standards for database failures, and hold the team to them.
• Own the direction and drive it forward: Define the long-term database platform strategy, drive cross-team initiatives from kickoff to delivery, and align database infrastructure decisions with broader engineering, compliance, and cost goals.

WHAT WE'RE LOOKING FOR

• 5+ years of experience in database engineering, platform engineering, or a related systems discipline, with a track record of technical leadership.
• Deep, hands-on PostgreSQL expertise: strong opinions on replication, sharding, backup strategies, upgrades, and security. Hands-on experience with Postgres automation and lifecycle tooling is required.
• Familiarity with ClickHouse and Cassandra/Scylla in production environments.
• Solid backend engineering background — Go is preferred but any strong language is welcome; familiarity with Kotlin/JVM is a plus as you'll work directly with product teams who rely on it.
• A track record of turning database best practices into opinionated standards that engineering teams actually adopt.
• Cloud-native in your DNA: hands-on with Kubernetes and IaC tooling, running production workloads on AWS or equivalent.
• Proven ability to define technical strategy, drive cross-team initiatives end-to-end, and hold yourself and others accountable to outcomes.
• Ability to contribute to architectural decisions and clearly communicate trade-offs to both engineers and leadership.
• The ability to work in a flexible hybrid setup, with 2-3 days a week in the office.

WHY YOU SHOULD APPLY NOW

Our culture rewards ownership, excellence, and high energy. We care deeply about outcomes and hold each other accountable — we're here to win and fix one of the largest challenges Europeans face — closing the pension gap and democratising wealth. If this gets you fired up, reach out!

Your Impact

The Staff Software Engineer (Platform) leads large-scale projects and is a key contributor to their group's success. They are involved in long-term strategic planning, mentor senior engineers, and are influential in technical decision-making across multiple teams or a department. They focus on implementation and system design, as well as maintaining and evolving DISCO’s distributed data platform.

What You'll Do 

• Technical Leadership and Mentorship: Provides technical leadership in project teams, guiding engineers, and contributing to technical decision-making. Sets technical direction for large projects or teams, driving innovation, and solving organization-wide problems.
• Performance Optimization: Focuses on designing systems for high performance, scalability, and reliability.
• Ownership: Proactively identifies areas of products and systems that currently have problems or will develop problems as well as makes plans to address those problems.
• Stakeholder Engagement: Works with stakeholders, including product managers, designers, developers, and executives, to align architectural designs with business needs and customer expectations.
• Software Development: Designs, develops, and maintains sophisticated, scalable, high-performance data software solutions, ensuring they are efficient, scalable, and meet business requirements with architectural excellence for our big data platform at petabyte scale. Responsible for the boundary identification, system design and grooming for one or more sub-systems.
• Code Quality and Optimization: Upholds and enhances code quality through rigorous review processes, optimization techniques, and adherence to best practices.
• Technical Problem Solving: Addresses intricate technical issues through innovative problem-solving strategies.
• Collaboration and Communication: Works effectively within the engineering team and cross-functional teams, collaborating with other engineers, product managers, and stakeholders, contributing to project planning and execution.
• Continuous Learning and Adaptation: Stays updated with the latest technology trends and advancements, continually enhancing skills and knowledge, bringing innovative ideas to the team.
• Technical Documentation: Creates and maintains comprehensive technical documentation, ensuring clarity and accessibility of information.
• Data Platform Development: Builds and maintains scalable and robust data platforms to support analytics, machine learning, and business intelligence.
• Data Integration and ETL: Develops and optimizes ETL (Extract, Transform, Load) processes and data integration pipelines. Ensures efficient data flow across various sources and systems.
• Advanced File Processing: Develops extensible file processing pipelines that offer flexible, self-service artifact generation. Researches and evaluates file processing software based on fidelity, reliability, and performance criteria. Models file processing outcomes within an observability framework to provide insights for engineering teams and business leaders. Develops engineering systems that facilitate rapid and automatic evaluation of file processors.
• Data Management: Crafts and orchestrates scaleout data pipelines that optimize serverless and containerized compute to balance cost, latency, and duration for big-data solutions. Contributes to algorithmically intensive data engines operating on streaming, large, or multi-tenant datasets. Troubleshoots systems, identify root causes, and rectify bugs.

Who You Are 

• 10+ years of relevant experience in backend engineering, with a substantial focus on big data platforms.
• 7+ years of professional experience with each of the following: Service Oriented Architecture, Docker-based services, micro-services, API and Data Model Design or Implementation.
• Experience with Large-Scale Systems: Involvement in developing, monitoring and maintaining large-scale, high-availability software systems.
• Experience designing and developing from a Security Perspective.
• Demonstrated experience in leading or playing key roles in significant software projects, showing an ability to work effectively both independently and as part of a team.
• Demonstrated expertise in designing, implementing, and maintaining (through operational observability) high-availability, high-performance, distributed data processing systems.
• Experience with gRPC and Protocol Buffers for efficient, language-agnostic service-to-service communication.
• Proven ability to deliver well-crafted, tested, and maintainable code solutions to complex technical challenges.
• Experience with a variety of software stacks including but not limited to, JVM-focused tech stacks, particularly server-side Kotlin and gRPC.
• Deep expertise with both relational and non-relational data stores, Elasticsearch, Cassandra, MySQL, and PostgreSQL.
• Experience delivering data platform software solutions (including designing, implementing, and operating) in the cloud.
• Knowledge of microservices architecture principles, including decentralized data management, service discovery, and bounded contexts. Skilled in microservices technology stack, ability to optimize performance, and ensure security and scalability across the system.
• Skilled in containerization technologies such as Docker and orchestration tools like Kubernetes.
• Experience in creating, deploying, and managing containers. Skilled in implementing RESTful APIs for outward-facing services and using gRPC for efficient internal service-to-service communication.
• Ability to build backend systems that can support future UI/UX initiatives and performance requirements.
• Knowledge of system architecture, design patterns, and best practices in software development.
• Skilled at designing and operating software in a Cloud Provider, such as AWS, Azure, or GCP.
• Knowledge of both relational and non-relational data stores, Elasticsearch, Cassandra, MySQL, PostgreSQL.
• Skilled at analytical abilities and problem-solving, capable of addressing complex technical challenges.
• Skilled in programming languages and frameworks commonly used in SaaS development. In particular, Java/Kotlin, Python, C#, as well as a deep understanding of software engineering principles.
• Familiarity with server management, network configurations, and an understanding of cloud services (like AWS, Azure, or Google Cloud).
• Knowledge of various stages of the SDLC, including design, development, testing, and deployment.
• Knowledge of async message or event based dataflow architectures (Kafka, etc).
• Knowledge of design, implementation, and operation of data-intensive, distributed systems.

Even Better If You Have

• Experience selecting and extending 3rd party components (commercial or open source) that
• provide operational leverage.
• Familiarity with Agile development methodologies and practices.
• Experience using feature or release toggles as a code branching strategy.
• Experience leveraging observability systems (logging, metrics, traces) to monitor and debug
• production subsystems and generate business level metrics.
• Experience with algorithmically intensive data engines operating on streaming, large, or
• multi-tenant datasets.
• Experience with designing, modifying, and operating multi-tenant systems.
• Experience with tools such as Envoy or AWS App Mesh.
• Experience with CI/CD pipelines and tools (like Jenkins, GitLab CI, or CircleCI) for automated
• testing and deployment of microservices.

Perks of DISCO

• Open, inclusive, and fun environment
• Benefits, including medical and dental insurance
• Competitive salary plus discretionary bonus
• Competitive salary plus RSUs
• Opportunity to be a part of a startup that is revolutionizing the legal industry
• Growth opportunities throughout the company

📍London / UK Remote | 💰 Engineer III £78,000 - £110,000 + Incentive Awards tied to your performance + Benefits | Technology - Engineering |  

About our Engineering Teams:

We have around 400 engineers across Monzo who design and build our in-house banking platform. We have big ambitions for the future, and technology plays a big role in creating a bank our customers want, so engineers at Monzo collaborate across disciplines to solve interesting challenges throughout the company.

These range from the products our customers use everyday to underlying infrastructure, security, payments and finance, customer operations, financial crime, and data, to name just a few areas. As a bank, there is scope for impact across a huge number of opportunities.

We contribute to open source software as much as possible. Our blog is a good place to learn even more about what we do!

Your day-to-day   

This role is all about collaborating with your team to make a difference to your customers. As a backend engineer you’ll work in a squad alongside other disciplines like product managers, marketers, user researchers, designers, mobile engineers, web engineers, data analysts, business analysts, writers and more! 

Together you'll build and support a particular part of Monzo. Our squads belong to our wider collectives (a word we use to describe self-governing business units of ~100 people). They are: Core Banking, Business Banking, Wealth, Borrowing, Growth, Payments, Platform, Fincrime, Security & Expansion. All of our collectives are doing innovative work, many of which have machine learning and AI at the forefront- from fighting financial crime to building smarter financial tools - and you may have the opportunity to join a collective that gives you direct exposure to this exciting space.

They’re all looking for additional Backend Engineers right now, we do a standard interview process across all our collectives and at the end we will find the best match for you based on your skills, experience, preferences and aligning with the business need! 

Our backend engineers have a variety of different backgrounds. As long as you enjoy learning new things, we’d love to talk to you. We do not ask for formal qualifications or degree requirements for any of our engineering roles.

How we work 💻:

Locations & Flexible Working : 

Our main tech hub is in London, but our engineers live everywhere in the UK— from Brighton to the Western Isles.

We value meeting in person but there’s no pressure to come into the office, even if you're nearby. We believe you'll do your best work if you are where you want to be. If you live outside of London and we ask you to come into the office, Monzo will support you with the costs. ✨

Our offices are naturally social, especially Tuesdays, Wednesdays and Thursdays, which happen to line up with our twice-weekly Monzo lunches & treat Thursdays 🍽️. Teams also schedule time together often for work and play – in or around the office, or online.

Set up a work schedule that delivers impact and fits your life.

At Monzo, we value connections, flexibility, and wellbeing. We keep our meetings during core hours to stay connected and believe in maintaining work/life balance. 
You’ll be empowered to manage your work in a way that suits you and your team, giving you the freedom for children drop-offs and pick-ups, walking your dog or adventurous cat, avoiding peak commuting times or gym slots, appointments, or supporting your family in an emergency. 🕒✨

Work the way that works for you with Monzo! 💼

You should apply if:

• you have strong experience working on the backend of a technology product
• you want to be involved in building a product that you (and the people you know) use every day
• you have a product mindset: you care about customer outcomes and you want to make data-informed decisions
• you’re comfortable working in a team that deals with ambiguity
• you’re interested in distributed systems and writing resilient software
• you have some experience with strongly-typed languages (Go, Java, C, Scala etc.).
• you think you’d enjoy the kind of work we’re doing

We're on the look out for L40 Engineers at the moment, you can read more in our Engineering Progression Framework you will be interviewed across the whole framework, so if you're not sure what level you're aiming for chat to your recruiter! 

Not ticking every box? That’s totally okay! Studies show that women and people of colour might hesitate to apply unless they meet every single requirement. At Monzo, we’re dedicated to creating a diverse and welcoming team. If you’re passionate about this role and keen to learn and grow with us, we encourage you to apply— even if you don’t have everything thats listed just yet. Drop us your application, we’d love to hear from you!

What you’ll be working on: 

We hire very technically agnostic so whilst we use the below technologies we do not expect prior knowledge, you will be fully supported in our organised onboarding to get up to speed in the below: 

• Go to write our application code (there’s an excellent interactive Go tutorial here)
• Cassandra for most persistent data storage
• Kafka for our asynchronous message queue
• Kubernetes and Docker to schedule and run our services 
• Envoy Proxy for RPC
• AWS for most of our production infrastructure and GCP for most of our data infrastructure
• React for our public web apps and internal tools
• We also have physical datacenters with actual cables to connect to various third parties

The Interview Process:

Our interview process involves three main stages: 

1. Initial Call 
2. Take home task or pair coding exercise 
3. Final interview: including a system design and a behavioural interview 

Our average process takes around 4 weeks but we will always work around your availability. 

One of our engineers has written a detailed blog on their experience through this process, for extra details, hints and tips please see here.

What’s in it for you:

💰 £78,000 - £110,000 base salary➕ plus stock options 

✈️We can help you relocate to the UK 

✅We can sponsor visas.

📍This role can be based in our London office, but we're open to distributed working within the UK (with ad hoc meetings in London).

⏰We offer flexible working hours and trust you to work enough hours to do your job well, at times that suit you and your team.

📚Learning budget of £1,000 a year for books, training courses and conferences

➕And much more, see our full list of benefits here 

We're usually always hiring for Backend Engineers, so there's no closing date for this job.

#LI-Remote

#LI-HJ1

📍London / UK Remote | 💰 £135,000 - £184,000 + Share Options | Benefits | Technology 

Senior Staff Engineer: L70 on our Engineering Progression Framework

About our Engineering Teams:

We have around 600 engineers out of roughly 5,000 people in total - and we have big ambitions. There are many interesting challenges ahead, and we're happy for people to move between teams or to specialise, whatever you prefer. As an engineer here you'd be able to work directly with anyone across the company, and we run regular knowledge-sharing sessions so you’ll learn heaps about everything from how banks work to effective communication.

We contribute to open source software as much as possible. Our blog is a good place to learn even more about what we do.

Senior Staff Engineer Responsibilities:

A Senior Staff Engineer at Monzo is a hands on engineering leadership (IC) position. As a Senior Staff Engineer you’ll:

• Partner with Engineering Directors to shape the technical and product direction of a collective, providing leadership across multiple squads (30–70+ engineers) and ensuring alignment with company-wide priorities.
• Be hands on in both coding and architecture, leading from the front.
• Partner closely with Product and Design leadership to define strategy, shape roadmaps, and make high-quality trade-offs that maximise business and customer impact across the collective.
• Mobilise teams across your collective around high-impact problems, creating clarity, alignment and momentum, injecting urgency when needed, or slowing things down to ensure safety and long-term sustainability.
• Lead and influence architectural direction for the most complex systems, ensuring cohesive, scalable designs across multiple teams and aligning local decisions with the broader system strategy.
• Set and uphold a high bar for technical excellence across the collective, driving improvements in quality, reliability and scalability, and fostering a culture where engineers hold each other to that standard.
• Proactively mentor, sponsor and develop senior engineers and future leaders, multiplying your impact by enabling others to operate at a higher level.

What you’ll be using/ What you’ll be working on: 

We rely heavily on the following tools and technologies:

• Go to write our application code (there’s an excellent interactive Go tutorial here)
• Cassandra for most persistent data storage
• Kafka for our asynchronous message queue
• Kubernetes and Docker to schedule and run our services 
• AWS for most of our production infrastructure and GCP for most of our data infrastructure.
• React for internal Web dashboards
• Feast for storing our features along a variety of tools to train and deploy models.

🤩We’d love to hear from you if… 

• You have a track record of leading complex, high-impact systems and driving technical direction across multiple teams
• You combine strong technical judgment with product and business awareness, making pragmatic trade-offs
• You’ve worked on scalable backend, distributed or data-intensive systems
• You’re comfortable operating in ambiguous problem spaces, helping teams define direction and execute
• You influence and align senior stakeholders across engineering, product and beyond
• You care about outcomes and impact, using data to guide decisions
• You enjoy mentoring and raising the bar for other engineers

🙌What’s in it for you

💰£140,000 - £184,000 ➕ share options.

✈️ We’ll help you relocate to the UK.

✅ We can sponsor your visa. 

📍This role can be based in our London office, but we're open to distributed working within the UK (with ad hoc meetings in London) 

⏰We offer flexible working hours and trust you to work enough hours to do your job well, and at times that suit you and your team. 

📚£1,000 learning budget each year to use on books, training courses and conferences.

🏡We will set you up to work from home; all employees are given Macbooks and for fully remote workers we will provide extra support for your work-from-home setup. 

➕ Plus lots more! Read our full list of benefits.

🌈 The application journey has 4 key steps

Our interview process involves four main stages after an informal recruiter call: 

1. Recruiter Call 
2. Initial Call 
3. System Design Interview 
4. Take home task or pair coding exercise 
5. Final interview including a behavioural and a leadership interview 

This process should take around 3-4 weeks - your schedule is really important to us, so we promise to be as flexible as possible! 

One of our staff engineers has written a detailed blog on their experience through this process, for extra details, hints and tips please see here.

#LI-Remote

#LI-ZM

📍London / UK Remote | 💰 Staff Backend Engineer (L60) £115,000 - £150,000 +  Incentive Awards tied to your performance + Benefits | Technology - Engineering  

About our Engineering Teams:

We have around 300 engineers out of roughly 2,500 people in total - and we have big ambitions. There are many interesting challenges ahead, and we're happy for people to move between teams or to specialise, whatever you prefer. As an engineer here you'd be able to work directly with anyone across the company, and we run regular knowledge-sharing sessions so you’ll learn heaps about everything from how banks work to effective communication.

We contribute to open source software as much as possible. Our blog is a good place to learn even more about what we do!

What you’ll be working on: 

We rely heavily on the following tools and technologies:

• Go to write our application code (there’s an excellent interactive Go tutorial here)
• Cassandra for most persistent data storage
• Kafka for our asynchronous message queue
• Envoy Proxy for RPC
• Kubernetes and Docker to schedule and run our services 
• AWS for most of our infrastructure
• React for internal web dashboards
• We also have two physical datacenter sites with actual cables to connect to various third parties

Your day-to-day   

This role is all about collaborating across disciplines to test hypotheses and make a difference to customers. As a product backend engineer you’ll work in a squad alongside product managers, marketers, user researchers, designers, mobile engineers, web engineers, data analysts, business analysts, writers and more! 

Together you'll build and support a particular part of Monzo. Our squads belong to our wider collectives (a word we use to describe self-governing business units of ~100 people). They are: Core Banking, Business Banking, Wealth, Borrowing, Growth, Payments, Platform, Fincrime, Security & Expansion. All of our collectives are doing innovative work, many of which have machine learning and AI at the forefront- from fighting financial crime to building smarter financial tools - and you may have the opportunity to join a collective that gives you direct exposure to this exciting space.

Our backend engineers have a variety of different backgrounds. As long as you enjoy learning new things, we’d love to talk to you. We do not ask for formal qualifications or degree requirements for any of our engineering roles.

How we work 💻

Locations & Flexible Working: 

Our main tech hub is in London, but our engineers live everywhere in the UK— from Brighton to the Western Isles. 

We value meeting in person but there’s no pressure to come into the office, even if you're nearby. We believe you'll do your best work if you are where you want to be. If you live outside of London and we ask you to come into the office, Monzo will support you with the costs. ✨

Our offices are naturally social, especially Tuesdays, Wednesdays and Thursdays, which happen to line up with our twice-weekly Monzo lunches & treat Thursdays 🍽️. Teams also schedule time together often for work and play – in or around the office, or online.

Set up a work schedule that delivers impact and fits your life:

At Monzo, we value connections, flexibility, and wellbeing. We keep our meetings during core hours to stay connected and believe in maintaining work/life balance. 

You’ll be empowered to manage your work in a way that suits you and your team, giving you the freedom for children drop-offs and pick-ups, walking your dog or adventurous cat, avoiding peak commuting times or gym slots, appointments, or supporting your family in an emergency. 🕒✨

Work the way that works for you with Monzo! 💼

You should apply if:

• you have strong experience working on the backend of a technology product
• you want to be involved in building a product that you (and the people you know) use every day
• you have a product mindset: you care about customer outcomes and you want to make data-informed decisions
• you’re comfortable working in a team that deals with ambiguity
• you’re interested in distributed systems and writing resilient software
• you have some experience with strongly-typed languages (Go, Java, C, Scala etc.).
• you think you’d enjoy the kind of work we’re doing

We're on the look out for L60 Engineers at the moment, you can read more in our Engineering Progression Framework we are also hiring on L40 & L50, our interview process will determine your levelling. 

The Interview Process:

Our interview process involves three main stages: 

1. Initial Call 
2. Take home task or pair coding exercise 
3. Final interview including a system design and a behavioural interview 

Our average process takes around 2-3 weeks but we will always work around your availability. 

One of our engineers has written a detailed blog on their experience through this process, for extra details, hints and tips please see here.

What’s in it for you:

💰 £115,000 - £150,000 base salary ➕ + Incentive Awards tied to your performance 

✈️We can help you relocate to the UK 

✅ We can sponsor visas.

📍This role can be based in our London office or remotely across the UK (with ad hoc meetings in London).

⏰We offer flexible working hours and trust you to work enough hours to do your job well, at times that suit you and your team.

📚Learning budget of £1,000 a year for books, training courses and conferences

➕And much more, see our full list of benefits here 

We're usually always hiring for Backend Engineers, so there's no closing date for this job.

#LI-Remote

#LI-HJ1

📍London / UK Remote | 💰 Senior Engineer (L50) £95,000 - £130,000 + Incentive Awards tied to your performance + Benefits | Technology - Engineering  

About our Engineering Teams:

We have around 400 engineers across Monzo who design and build our in-house banking platform. We have big ambitions for the future, and technology plays a big role in creating a bank our customers want, so engineers at Monzo collaborate across disciplines to solve interesting challenges throughout the company.

These range from the products our customers use everyday to underlying infrastructure, security, payments and finance, customer operations, financial crime, and data, to name just a few areas. As a bank, there is scope for impact across a huge number of opportunities.

We contribute to open source software as much as possible. Our blog is a good place to learn even more about what we do!

Your day-to-day   

This role is all about collaborating with your team to make a difference to your customers. As a backend engineer you’ll work in a squad alongside other disciplines like product managers, marketers, user researchers, designers, mobile engineers, web engineers, data analysts, business analysts, writers and more! 

Together you'll build and support a particular part of Monzo. Our squads belong to our wider collectives (a word we use to describe self-governing business units of ~100 people). They are: Core Banking, Business Banking, Wealth, Borrowing, Growth, Payments, Platform, Fincrime, Security & Expansion. All of our collectives are doing innovative work, many of which have machine learning and AI at the forefront- from fighting financial crime to building smarter financial tools - and you may have the opportunity to join a collective that gives you direct exposure to this exciting space.

They’re all looking for additional Backend Engineers right now, we do a standard interview process across all our collectives and at the end we will find the best match for you based on your skills, experience, preferences and aligning with the business need! 

Our backend engineers have a variety of different backgrounds. As long as you enjoy learning new things, we’d love to talk to you. We do not ask for formal qualifications or degree requirements for any of our engineering roles.

How we work 💻

Locations & Flexible Working: 

Our main tech hub is in London, but our engineers live everywhere in the UK— from Brighton to the Western Isles. 

We value meeting in person but there’s no pressure to come into the office, even if you're nearby. We believe you'll do your best work if you are where you want to be. If you live outside of London and we ask you to come into the office, Monzo will support you with the costs. ✨

Our offices are naturally social, especially Tuesdays, Wednesdays and Thursdays, which happen to line up with our twice-weekly Monzo lunches & treat Thursdays 🍽️. Teams also schedule time together often for work and play – in or around the office, or online.

Set up a work schedule that delivers impact and fits your life:

At Monzo, we value connections, flexibility, and wellbeing. We keep our meetings during core hours to stay connected and believe in maintaining work/life balance. 

You’ll be empowered to manage your work in a way that suits you and your team, giving you the freedom for children drop-offs and pick-ups, walking your dog or adventurous cat, avoiding peak commuting times or gym slots, appointments, or supporting your family in an emergency. 🕒✨

Work the way that works for you with Monzo! 💼

You should apply if:

• you have strong experience working on the backend of a technology product
• you want to be involved in building a product that you (and the people you know) use every day
• you have a product mindset: you care about customer outcomes and you want to make data-informed decisions
• you’re comfortable working in a team that deals with ambiguity
• you’re interested in distributed systems and writing resilient software
• you have some experience with strongly-typed languages (Go, Java, C, Scala etc.).
• you think you’d enjoy the kind of work we’re doing

We're on the look out for L50 Engineers at the moment, you can read more in our Engineering Progression Framework - we will interview you across the whole frame work, so if you are not sure what level you are aiming for please chat to your recruiters! 

Not ticking every box? That’s totally okay! Studies show that women and people of colour might hesitate to apply unless they meet every single requirement. At Monzo, we’re dedicated to creating a diverse and welcoming team. If you’re passionate about this role and keen to learn and grow with us, we encourage you to apply— even if you don’t have everything thats listed just yet. Drop us your application, we’d love to hear from you!

What you’ll be working on: 

We hire very technically agnostic so whilst we use the below technologies we do not expect prior knowledge, you will be fully supported in our organised onboarding to get up to speed in the below: 

• Go to write our application code (there’s an excellent interactive Go tutorial here)
• Cassandra for most persistent data storage
• Kafka for our asynchronous message queue
• Kubernetes and Docker to schedule and run our services 
• Envoy Proxy for RPC
• AWS for most of our production infrastructure and GCP for most of our data infrastructure
• React for our public web apps and internal tools
• We also have physical datacenters with actual cables to connect to various third parties

The Interview Process:

Our interview process involves three main stages: 

1. Initial Call 
2. Take home task or pair coding exercise 
3. Final interview: including a system design and a behavioural interview 

Our average process takes around 4 weeks but we will always work around your availability. 

One of our engineers has written a detailed blog on their experience through this process, for extra details, hints and tips please see here.

What’s in it for you:

💰 £95,000 - £130,000 base salary + Incentive Awards tied to your performance

✈️We can help you relocate to the UK 

✅We can sponsor visas.

📍This role can be based in our London office, but we're open to distributed working within the UK (with ad hoc meetings in London).

⏰We offer flexible working hours and trust you to work enough hours to do your job well, at times that suit you and your team.

📚Learning budget of £1,000 a year for books, training courses and conferences

➕And much more, see our full list of benefits here 

We're usually always hiring for Backend Engineers, so there's no closing date for this job.

#LI-Remote

#LI-HJ1

Why You Should Join the Internationalisation Platform Team

The i18n Platform team owns all the ways we create, process and deliver internationalisation features for our users at Klaviyo.  As a Senior Software Engineer, you will be a key contributor and mentor leading complex, multi-component projects across the i18n platform. You will be involved in how we manage translations, deliver new localisation features, handle multiple currencies, and improve our internationalisation processes.

You can look forward to being a part of a highly technical team with significant domain expertise. We oversee tools and services that are leveraged across the organization from the frontend UI to backend data.  The team also owns and orchestrates several services to manage the pipeline of translations with our localisation team.

As we look toward the next 6-12 months, we aim to focus on delivering LLM workflows to improve our translation capabilities, increase the availability of our Smart Translations product, and develop new features for handling different currencies in multiple regions.

Why you should join

We foster a culture of psychological safety, collaboration, and work/life balance through flexible hours and structured on-call rotations.

We practice a “you make it, you support it” attitude to our products and provide on-call support in case of incidents.  We offer compensation for on-call rotations and expect to maintain a very low number of incidents requiring call-out.  New engineers are onboarded to the on-call rotation gradually, typically joining the active rotation after their first 6 months and thorough training.
We are committed to your growth. You will be paired with a dedicated mentor and given time for focused skill development, including opportunities to attend relevant industry conferences and a growing suite of learning & development opportunities.

We enjoy a high degree of autonomy to generate innovative solutions across the entire system, learning directly from customers and suggesting cool new approaches.

Free lunch at our Aldgate office three times a week
Highly competitive salary, equity package, and comprehensive health benefits.

How You Will Make a Difference

• You will lead and drive the design and execution of complex, business-critical projects across the Internationalisation platform.
• You will be responsible for implementing new functionality and establishing design patterns for complex, multi-component systems.
• You will take full lifecycle ownership of features and projects, driving requirement refinement and setting the pace for all phases of execution.
• You will proactively collaborate with cross-functional partners to influence product requirements and communicate technical needs to other teams.
• You will be an active participant in all team processes and accountable for meeting the health and operational excellence (SLOs) of your area of ownership.
• You will help interview new engineering team members and actively mentor junior engineers in your product area.

What we are looking for

• A strong interest in internationalisation, localisation, and translation.
• A desire to serve our international customers and expand Klaviyo’s capabilities.
• 5+ years of demonstrable experience delivering high-quality, customer-facing software.
• Deep understanding of complex systems (or similar large-scale distributed systems) and strong systems thinking, with a proven ability to scale, observe, and maintain services.
• Familiarity with full stack development concepts and a strong aptitude to learn.
• Experience working with both monolithic and microservices architectures
• Experience with database design that can withstand high query volumes
• Experience debugging performance issues and improving application performance
• An interest and aptitude for collaboration across teams and disciplines
• An understanding of challenges in developing software across multiple languages and catering to non-English speaking users
• Thrives in a fast paced, customer focused, and strategic environment.
• A track record of prioritizing the needs and success of the company overall above the immediate needs of the team.

Nice to Have

• Proven experience with large-scale system design and driving the technical/architectural evolution of a product area.
• Experience with AWS or any similar cloud provider
• Experience with billing systems in multiple currencies

Technologies we use (not exhaustive):

• React, TypeScript, JavaScript, HTML, CSS
• Babel, Webpack, Eslint, Prettier
• REST, GraphQL, JSON Schema, JSON:API
• CDNs (Fastly, Cloudflare)
• GitHub, BuildKite
• MySQL, Redis, Pulsar, Memcache
• Python, Django, FastAPI, Go, Gin, React, RabbitMQ, Celery, MySQL, DynamoDB, Cassandra, Redis
• DeepL, Smartling, Stripe
• Amazon Web Services (EC2, RDS, Aurora, AWS Translate, etc.), Terraform, Kubernetes, Splunk, Chronosphere, Cortex, DX, and other modern DevOps tools
• Bedrock, Claude, Cursor, LangChain, OpenAI, Gemini,

We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.

Please see the independent bias audit report covering our use of Covey here