Senior Backend Engineer

Overview

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

• 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

• 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.
• Show us how your work and reasoning – You’ll meet with a member of our engineering team to complete a Live pseudo-code exercise.
• 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.
• Get to know your would-be manager – you’ll have a call with our VP of Engineering to learn more about the role and show off your experience.
• How our values and your career goals align – you’ll have a call with our cofounder to learn more about life at the company and ensure we’re the right place for your next stage of growth.

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); 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 – Open and trusting communication with each other, customers, partners, and other stakeholders.
• We act as responsible owners – Freedom to make decisions within our area of responsibility is a crucial driver for us.
• We share a passion for growth & progress – We seek new challenges and action feedback to improve collectively.
• We set our ambitions high but stay humble – We build a product and a category that’s never been seen before, while maintaining discipline.
• We believe the right team is the key to success – The right people collaborating together is essential; we invite you to apply today.