Senior Web Developer - Contractor

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Join to apply for the Senior Web Developer - Contractor role at Cleo

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.

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 $200 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.

Follow us on LinkedIn to keep up to date with new product features and insights from the team.

What we're looking for

We’re on the hunt for a radically hands‑on Senior Web Developer - someone who doesn’t wait for permission, doesn’t need hand‑holding, and thrives pushing boundaries. Your mission: rebuild websites that are immersive, playful, and unapologetically futuristic. Think: add video, make text crawl around the video, imaginative interactions, all‑custom pages, immersive sci‑fi flair. No templates. No safe zones.

For this frontend focused role, we also have some specific asks:

As this is an SE4 position, we’re looking for someone with strong industry experience of using React with TypeScript for a minimum of 5+ years. If it’s a less than that, maybe you want to look at our Product Engineer role.

What you’ll be doing

Rebuild and reimagine websites from the ground up - every page is custom-coded, unique, experimental.
Add multimedia experiences, like embedding video backgrounds and animating text that reacts to scroll or hover.
Build interactions that feel alive - interactive “immersive sci‑fi” components that spark curiosity.
Own your work - you understand urgency, deliver without prodding, and ship polished results fast.
Translate Figma designs into fully functioning experiences - pixel-perfect, responsive, and dynamic.
Iterate swiftly based on feedback - you're comfortable shipping often and refining as you go.

About You

Senior-level experience in web development - solid track record rebuilding or transforming websites with custom code.
Expert in front-end technologies, including (but not limited to) HTML5, CSS3 (animations and transitions), JavaScript (modern frameworks or vanilla).
Figma master - you can interpret complex designs and turn them into fluid, working pages.
Independent, proactive mindset - you can take a concept and run with it; no micromanagement needed.
Comfortable with urgency - you understand deadlines, act with immediacy, and deliver without sacrificing quality.
Creative coder - you relish building playful, experimental, sci-fi‑themed interactions that stand out.

Nice-to-Have (Bonus Points)

Experience with canvas, WebGL, or three.js for 3D or immersive effects.
Prior work featuring motion design, scroll-triggered animations, or interactive storytelling.
Familiarity with performance optimization for dynamic media-rich pages.

Our Tech Stack

NextJS website.
Hosted / deployed with Vercel.
DatoCMS.
Appsflyer for attribution data.

More On Our Stack

Built as a Ruby on Rails monolith with a React Native frontend using TypeScript.
We leverage Python for machine learning services and PostgreSQL as our database.
All infrastructure is hosted on AWS
Our CI/CD pipeline is fully automated, with production deployments on every merge via Heroku.

While we take a pragmatic approach, we place a strong emphasis on quality. Our code is peer-reviewed, and we maintain automated testing using Minitest and CircleCI. We're also actively working towards a more modular architecture, focusing on separating concerns to achieve all the benefits of microservices within a monolith, while progressively refactoring our code as we build new features. Everyone in the engineering team contributes to driving our technical strategy, voices & ideas from all levels are valued: we are all owners at Cleo.

Why join us

You’ll be empowered to experiment, push design & code boundaries, and actually see imaginative ideas come to life.
Full creative control - your custom pages, your rules.
Fast‑paced and nimble - we value swift, high-quality delivery over red tape.
Supportive, flexible environment - you’ll have the autonomy to do your best work your way.

This Is a 3-stage Interview Process

Interview with the Recruiter (30 mins)
Technical interview with the Hiring Manager (60 mins)
Interview with the Team (30 mins)

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.

UK App access: The Cleo app is no longer downloadable in the UK. If you’re an existing user, you’ll still have access to the app. But some features won’t be available. 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. Then we’ll be able to apply what we learn to better support our UK users in the future.

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. 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 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's Candidate Privacy Notice

Seniority level

Seniority level
Mid-Senior level

Employment type

Employment type
Full-time

Job function

Job function
Engineering and Information Technology

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Location:: London, England, United Kingdom
Salary:: £150,000 - £200,000
Job Type:: FullTime
Category:: IT & Technology

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