Senior Engineers - Polyglots | UK (hybrid + remote) Office: United Kingdom Remote: UK in London

About Cleo

At Cleo, we're not just building another fintech app. We're embarking on a mission to fundamentally change humanity's relationship with money. Imagine a world where everyone, regardless of background or income, has access to a hyper-intelligent financial advisor in their pocket. That's the future we're creating. Cleo is a rare success story: a profitable, fast-growing unicorn with over $300 million in ARR and growing over 2x year-over-year. This isn't just a job; it's a chance to join a team of brilliant, driven individuals who are passionate about making a real difference.

About the role

At Cleo, we care far more about how you think than which language you’ve used before. While much of our product runs on Ruby today, we’re deliberately hiring polyglot engineers because diverse technical backgrounds make our teams stronger. If you’ve shipped meaningful product work in any modern stack, you’ll ramp quickly here. What matters most is curiosity, thoughtful engineering, and a willingness to learn.

What you'll be doing

• You’ll join a cross-functional product squad and work closely with engineers, designers, analysts, and product partners to build features that improve our users’ financial health.
• You’ll shape the direction of upcoming work, break down problems with your team, and help drive projects from early discovery all the way to shipped impact.
• You’ll work across our backend and product systems – much of which runs in Ruby today – but you don’t need Ruby experience to thrive here.
• You’ll build and evolve APIs, data models, and business logic; contribute to testing, observability, and experimentation; and help us continuously improve developer experience and product quality.
• You’ll mentor others at your level, share knowledge generously, and contribute to a team culture where engineers grow quickly and have real influence.

About you

You care about building products that genuinely help people, and improving financial health is a mission that resonates with you. You’re an engineer with solid fundamentals who has worked in any modern tech stack. What matters is your ability to reason clearly, learn quickly, think in trade-offs, and write maintainable, thoughtful code.

You collaborate well with product, design, and data; you’re curious about users; and you enjoy shaping work beyond just the technical bits. You align with our values and engineering principles – rooted in autonomy, accountability, pragmatism, and building things that genuinely improve people’s lives.

Our tech stack

Cleo is built as a Ruby on Rails monolith with a single React Native app frontend, utilising TypeScript. We also leverage Python for machine learning services and PostgreSQL for our database, all hosted on AWS. Our CI/CD pipeline is fully automated, with production deployments happening on every merge via Kubernetes.

What do you get for all of your hard work?

• A competitive compensation package (base + equity) with three annual reviews.
• A clear progression plan. We want you to keep growing.
• Flexibility. We work with everyone to make sure they have the balance they need to do their best work.
• Work where you work best. We’re a globally distributed team.
• Other benefits include company-wide performance reviews every 6 months, generous pay increases for high-performing team members, equity top-ups for team members getting promoted, 25 days annual leave a year + public holidays, 6% employer-matched pension in the UK, private medical insurance, enhanced parental leave, and many more!

We strongly encourage applications from people of colour, the LGBTQ+ community, people with disabilities, neurodivergent people, parents, carers, and people from lower socio-economic backgrounds.