Kafka Jobs in Cardiff.
All active Kafka roles based in Cardiff.
Pick a job to read the details
Tap any role on the left — its description and apply link will open here.
🚀 We’re on a mission to make money work for everyone.
We’re waving goodbye to the complicated and confusing ways of traditional banking.
After starting as a prepaid card, our product offering has grown a lot in the last 10 years in the UK. As well as personal and business bank accounts, we offer joint accounts, accounts for 16-17 year olds, a free kids account and credit cards in the UK, with more exciting things to come beyond. Our UK customers can also save, invest and combine their pensions with us.
With our hot coral cards and get-paid-early feature, combined with financial education on social media and our award winning customer service, we have a long history of creating magical moments for our customers!
We’re not about selling products - we want to solve problems and change lives through Monzo ❤️
📍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:
- Initial Call
- Take home task or pair coding exercise
- 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
Equal opportunities for everyone
Diversity and inclusion are a priority for us and we’re making sure we have lots of support for all of our people to grow at Monzo. At Monzo, we’re embracing diversity by fostering an inclusive environment for all people to do the best work of their lives with us. This is integral to our mission of making money work for everyone. You can read more in our blog, 2024 Diversity and Inclusion Report and 2024 Gender Pay Gap Report.
We’re an equal opportunity employer. All applicants will be considered for employment without attention to age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, or veteran, neurodiversity or disability status.
If you have a preferred name, please use it to apply. We don't need full or birth names at application stage 😊
Ready to apply?
Apply to Monzo
🚀 We’re on a mission to make money work for everyone.
We’re waving goodbye to the complicated and confusing ways of traditional banking.
After starting as a prepaid card, our product offering has grown a lot in the last 10 years in the UK. As well as personal and business bank accounts, we offer joint accounts, accounts for 16-17 year olds, a free kids account and credit cards in the UK, with more exciting things to come beyond. Our UK customers can also save, invest and combine their pensions with us.
With our hot coral cards and get-paid-early feature, combined with financial education on social media and our award winning customer service, we have a long history of creating magical moments for our customers!
We’re not about selling products - we want to solve problems and change lives through Monzo ❤️
📍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:
- Initial Call
- Take home task or pair coding exercise
- 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
Equal opportunities for everyone
Diversity and inclusion are a priority for us and we’re making sure we have lots of support for all of our people to grow at Monzo. At Monzo, we’re embracing diversity by fostering an inclusive environment for all people to do the best work of their lives with us. This is integral to our mission of making money work for everyone. You can read more in our blog, 2024 Diversity and Inclusion Report and 2024 Gender Pay Gap Report.
We’re an equal opportunity employer. All applicants will be considered for employment without attention to age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, or veteran, neurodiversity or disability status.
If you have a preferred name, please use it to apply. We don't need full or birth names at application stage 😊
Ready to apply?
Apply to Monzo
🚀 We’re on a mission to make money work for everyone.
We’re waving goodbye to the complicated and confusing ways of traditional banking.
After starting as a prepaid card, our product offering has grown a lot in the last 10 years in the UK. As well as personal and business bank accounts, we offer joint accounts, accounts for 16-17 year olds, a free kids account and credit cards in the UK, with more exciting things to come beyond. Our UK customers can also save, invest and combine their pensions with us.
With our hot coral cards and get-paid-early feature, combined with financial education on social media and our award winning customer service, we have a long history of creating magical moments for our customers!
We’re not about selling products - we want to solve problems and change lives through Monzo ❤️
📍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:
- Recruiter Call
- Initial Call
- System Design Interview
- Take home task or pair coding exercise
- 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
Equal opportunities for everyone
Diversity and inclusion are a priority for us and we’re making sure we have lots of support for all of our people to grow at Monzo. At Monzo, we’re embracing diversity by fostering an inclusive environment for all people to do the best work of their lives with us. This is integral to our mission of making money work for everyone. You can read more in our blog, 2024 Diversity and Inclusion Report and 2024 Gender Pay Gap Report.
We’re an equal opportunity employer. All applicants will be considered for employment without attention to age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, or veteran, neurodiversity or disability status.
If you have a preferred name, please use it to apply. We don't need full or birth names at application stage 😊
Ready to apply?
Apply to Monzo
🚀 We’re on a mission to make money work for everyone.
We’re waving goodbye to the complicated and confusing ways of traditional banking.
After starting as a prepaid card, our product offering has grown a lot in the last 10 years in the UK. As well as personal and business bank accounts, we offer joint accounts, accounts for 16-17 year olds, a free kids account and credit cards in the UK, with more exciting things to come beyond. Our UK customers can also save, invest and combine their pensions with us.
With our hot coral cards and get-paid-early feature, combined with financial education on social media and our award winning customer service, we have a long history of creating magical moments for our customers!
We’re not about selling products - we want to solve problems and change lives through Monzo ❤️
📍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:
- Initial Call
- Take home task or pair coding exercise
- 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
Equal opportunities for everyone
Diversity and inclusion are a priority for us and we’re making sure we have lots of support for all of our people to grow at Monzo. At Monzo, we’re embracing diversity by fostering an inclusive environment for all people to do the best work of their lives with us. This is integral to our mission of making money work for everyone. You can read more in our blog, 2024 Diversity and Inclusion Report and 2024 Gender Pay Gap Report.
We’re an equal opportunity employer. All applicants will be considered for employment without attention to age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, or veteran, neurodiversity or disability status.
If you have a preferred name, please use it to apply. We don't need full or birth names at application stage 😊
Ready to apply?
Apply to Monzo