About Cleo

At Cleo, we're not just building another fintech app. We're 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, this might be your perfect fit.

About the Role

We are looking for a Senior Python Engineer to join our Platform engineering team at Cleo. The right candidate will support product teams in achieving their OKRs while championing best practices in Python engineering and MLOps.

In this role, you'll:

Work directly with product teams to ensure they effectively adopt the tools, frameworks, and processes provided by the Data Platform team.
Enable teams to build scalable, efficient, and reliable data and ML solutions.
Help implement and operate robust Python services, monitoring strategies, and cost-efficient practices to improve data-driven capabilities.
Act as a bridge between product teams and the Data Platform team, surfacing challenges and collaborating to improve internal tooling and infrastructure.

This is an opportunity to blend hands-on engineering with strategic impact, influencing both product success and the evolution of our data platform.

What do you need?

Proficiency in Python, software engineering best practices, code quality, and maintainability
Containerisation & orchestration: Docker, Kubernetes
Understanding of product thinking and value creation
Experience working cross-functionally with data scientists, engineers, and product managers
Experience deploying and operating APIs and microservices
Strong knowledge of streaming PySpark
Experience building and managing data pipelines (Kubeflow, MLflow, Airflow, Flyte)
In-depth knowledge of Python 3.x, standard libraries, and core language features
Familiarity with Django, Flask, FastAPI
Data handling: Pydantic, Pandas, SQLAlchemy
Async programming: asyncio, concurrent.futures

What do you get for all your hard work?

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 + public holidays (+1 day per year of service, up to 30 days)
6% employer-matched pension (UK)
Private Medical Insurance via Vitality, dental cover, and life assurance
Enhanced parental leave
1 month paid sabbatical after 4 years at Cleo
Regular socials
OpenAI subscription covered
Online mental health support via Spill
Workplace Nursery Scheme

Diversity & Inclusion

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 currently unavailable for download in the UK (until next year). Existing users still have access, though some features are temporarily unavailable. With 99% of users based in the US, we’ve shifted focus to where we can provide the most value. Learnings from this will later be applied to better support UK users.

Application Disclaimer

By submitting this application, you confirm that all information provided is true to the best of your knowledge. Any false or incorrect information may result in rejection, withdrawal of an offer, or termination of employment. You also agree that your personal data will be processed in accordance with Cleo AI's Candidate Privacy Notice.

Senior Python Engineer