Senior Backend Engineer

🌍 UK / Europe (Remote or Hybrid, it’s up to you!)

💰 Dependent on experience

📈 Be part of our success with the opportunity to join our equity scheme

🦸‍♀️ The Role 🦸‍♀️

Our mission is to help large successful brands like Uber, Amazon, Wise, HelloFresh (and more!) put their customers at the centre of everything they do. Using best-in-class tech in a fast-evolving AI space, our Customer Experience Intelligence platform continuously analyses explicit and implicit feedback to help our clients identify what to do next.

We're now looking for a talented Senior Backend Engineer to join the team!

👉 What you'll be doing:

You’ll be designing, building and scaling the backend services and APIs that power Chattermill’s core analytics platform. Owning and driving the delivery of high-impact engineering workstreams and integrating AI capabilities into the product experience. This means you will:

• Design, build, and maintain scalable backend services and APIs that power Chattermill’s core analytics platform.

• Architect reliable, maintainable distributed systems and contribute to the evolution of backend service design and infrastructure.

• Own end-to-end delivery of backend engineering workstreams, from technical scoping and architecture through to implementation, testing, observability, and production support.

• Integrate language models, agentic frameworks, and AI pipelines into core product and backend services.

• Drive performance, reliability, and observability across high-throughput distributed data systems, including logging, tracing, alerting, and incident response.

• Work with cloud infrastructure and distributed systems in GCP (preferred) or AWS environments.

• Collaborate closely with Product to define scope, shape technical solutions, and explore new platform capabilities and features.

• Contribute to engineering excellence through code reviews, architectural discussions, and continuous improvement of development standards across the team.

🧰 What you’ll need:

•  Strong professional experience operating as a senior backend engineer within high-ownership product engineering teams.

• Strong proficiency in at least one modern backend language such as Python, Ruby, or Go, with a focus on scalable system design and architectural thinking.

• Solid understanding of distributed systems, RESTful APIs, and event-driven architectures.

• Experience optimising database performance at scale, including query tuning, indexing, and partitioning across large production datasets.

• Cloud platform experience, ideally within GCP environments, although AWS experience is also valued.

• Hands-on experience with observability tooling and production operations, including logging, tracing, alerting, and incident response.

• Proven ability to independently deliver backend features and technical projects in fast-paced product environments.

➕It would be a bonus if you:

• Experience integrating LLMs, prompt engineering techniques, or agentic frameworks such as Anthropic, OpenAI, or MCP.

• Familiarity with AI-assisted development workflows and tools such as Cursor, Copilot, or Claude Code.

• Experience working with ClickHouse, BigQuery, or other analytical databases supporting large-scale analytical workloads.

• Experience with customer feedback analytics, NLP, or text analytics platforms.

• Familiarity with Elasticsearch or large-scale search infrastructure.

• Experience building asynchronous or event-driven systems using technologies such as PubSub, Kafka, or equivalent.

• Contributions to open-source projects, conference speaking, or public technical writing.

🔎 Our Hiring Process

1. Let’s introduce ourselves – you’ll complete an introductory asynchronous interview - we’d love to learn more about you, your ambitions, and what you’re looking for in your next step.

2. Show us how your work and reason - You’ll meet with a member of our engineering team to complete a Live pseudo-code exercise.

3. Get to know your would-be team – You'll meet people you'll be working closely with from our Engineering team, and complete a System design and architecture-based interview.

4. Get to know your would-be manager – you’ll have a call with Ugo Anomelechi, our VP of Engineering, to learn more about the role and show off your experience.

5. How our values and your career goals align – you’ll have a call with our cofounder to learn more about life at Chattermill and ensure we’re the right place for your next stage of growth.

Our Perks

🤸🏽‍♂️ Flexibility & Work Setup

• Flexible working in a choice-first environment - we trust the way you want to work!

• Work-from-home allowance to set up your ideal workspace

🌴 Time Off

• 25 days holiday + local bank holidays, plus an extra day for each year of service

• Your birthday off

🌱 Growth & Ownership

• Annual learning & development budget to support your growth (increasing over time)

• Equity options — share in the company’s success

💚 Health & Wellbeing

• Monthly health & wellbeing budget, increasing with length of service

• Optional private healthcare plan

• Life assurance & income protection (location dependent)

• Employee Assistance Programme (location dependent) for extra support when you need it

• Enhanced family leave (location dependent), plus fertility and neonatal leave

🌆 Office Perks

• If you’re in London, a dog-friendly office with great classes, events, and a rooftop terrace

💖 Our Values 

• We are obsessed with experience – We take our mission to rid the world of bad Customer Experience seriously, and we practice what we preach.

• We believe in the power of trust – Whether it's with each other, our customers, partners, or other stakeholders, we always communicate with openness and trust.

• We act as responsible owners – Whether it's about the company, a team, a project, or a task, having the freedom to make decisions in our area of responsibility is a crucial driver for us.

• We share a passion for growth & progress – On every level, we’re motivated by taking on new challenges – even if they seem out of reach. We recognise that we are learning machines and we always seek to action feedback and improve collectively.

• We set our ambitions high but stay humble – We've come together to build a product and a category that’s never been seen before. While we're an ambitious bunch with lofty goals, we don't approach this goal carelessly.

• We believe the right team is the key to success – At Chattermill we’ve learned that all our important achievements have been the result of the right people collaborating together – that’s why we need you to apply today!

🌈 Diversity & Inclusion 🌈

We want to enable exceptional experiences for everyone, and to achieve this we need everyone’s voice in our team.  We are on a mission to bring more diversity into the business and to give everyone (from all backgrounds and abilities) a chance to join us, even if they may not fit all of the requirements set out in this job spec. We realise that some may be hesitant to apply for a role when they don’t meet 100% of the listed requirements – we believe in potential and will happily consider all applications based on the skills and experience you have, we’d love to be part of your growth and we encourage you to apply! 

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