About the Position

Staff Engineer - Ruby | UK & EU (remote)

At Cleo, we're on a mission to revolutionize how people interact with their finances. We're a profitable, fast-growing unicorn with over $300 million in ARR, and we're looking for a Staff Engineer to join our team and help us shape the future of financial technology.

Responsibilities

Acting as a Staff IC across a pillar, shaping technical direction and driving delivery across multiple squads
Partnering with senior peers to define architecture and lead complex, high-impact initiatives
Bringing teams together to ship ambitious product work that improves users’ financial health
Building shared systems, patterns, and tooling that raise the bar across engineering
Staying hands-on in our Ruby on Rails monolith - designing APIs, data models, and scalable services
Anticipating risks and opportunities early, influencing plans and technical strategy
Mentoring engineers and TLs, growing the next generation of technical leaders

Requirements

You’re excited by the opportunity to own and influence technical direction at a pillar level
You’ve operated at senior/staff level across multiple teams or complex domains
You bring strong technical judgment and think in long-term, scalable solutions
You’re comfortable leading without authority and aligning teams around a shared direction
You have a track record of building systems and practices used beyond your immediate team
You enjoy mentoring and raising the bar for others
You have strong, hands-on experience with Ruby on Rails (essential)
You're based in the UK or Europe; we hire hybrid & remote in the UK & fully remotely across the EU.

Our Tech Stack

Ruby on Rails monolith
Single React Native app frontend, utilizing TypeScript
Python for machine learning services
PostgreSQL for our database
Hosted on AWS
Fully automated CI/CD pipeline with production deployments on every merge via Kubernetes

We Offer

Competitive compensation package (base + equity) with 3 annual reviews
Clear progression plan with opportunities to try new things, lead others, and challenge the status quo
Flexibility to work where you work best, with a globally distributed team
Generous leave policies, including 25 days annual leave + public holidays, and an additional day for every year you spend at Cleo (up to 30 days)
1 month paid sabbatical after 4 years at Cleo
6% employer-matched pension in the UK
Private Medical Insurance via Vitality, dental cover, and life assurance
Online mental health support via Spill
Enhanced parental leave
Workplace Nursery Scheme
Paid access to multiple AI platforms (ChatGPT, Codex, Claude)
Access to the latest AI coding models
Pick your kit - choose between a Windows or an Apple computer
Regular socials and activities, online and in-person
And many more!

About the Company

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. We have an exceptionally high bar for talent, seeking individuals who are not only at the top of their field but also embody our culture of collaboration and positive impact.

If you’re driven by complex challenges that push your expertise, the chance to shape something truly transformative, and the potential to share in Cleo’s success as we scale, while growing alongside a company that’s scaling fast, this might be your perfect fit.

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.

If there’s anything we can do to accommodate your specific situation, please let us know.

App access: The Cleo app is downloadable in the UK & USA. We're not currently in the EU. Why? 99% of our users are based in the US – where financial health is often overlooked. We’ve decided to shift our focus to where we can provide the most value and make the greatest impact for users who need it most. We can share a slide deck detailing the app's capabilities in more detail, to help you through the interview process.

By submitting this application, I confirm that all the information given by me in this application for employment and any additional documents attached hereto are true to the best of my knowledge and that I have not wilfully suppressed any material fact. I confirm I have disclosed if applicable any previous employment with Cleo AI. I accept that if any of the information given by me in this application is in any way false or incorrect, my application may be rejected, any offer of employment may be withdrawn or my employment with Cleo AI may be terminated summarily or I may be dismissed. By submitting this application, I agree that my personal data will be processed in accordance with Cleo AI's Candidate Privacy Notice

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Staff Engineer - Ruby

Job Description, Responsibilities & Requirements