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Mid-senior backend engineer (ml integrations)

London
Cleo
Engineer
€125,000 - €150,000 a year
Posted: 2 June
Offer description

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 profitable, fast-growing unicorn with over $200 million in ARR, growing over 2x year-over-year. This is a unique opportunity to join a talented team passionate about making a real impact. We value top talent who embody our culture of collaboration and positive influence.

If you thrive on complex challenges, want to shape something transformative, and share in Cleo's scaling success, this could be your ideal role.


About the Role

You will be part of the team developing and maintaining decisioning systems that are crucial to Cleo's core product, directly influencing user experience, growth, and profitability.

Your main responsibility will be integrating ML-driven credit and eligibility models into our Ruby on Rails monolith. These models, developed in Python by ML engineers and data scientists, require scalable, robust integration. You will manage the entire lifecycle from data ingestion to monitoring and observability.

You will collaborate closely with ML engineers, analysts, and PMs to ensure model outputs are accessible, behavioral anomalies are debugged, and stakeholders have the necessary tools to understand decision-making processes.

You will also contribute to our Ruby chapter, enhancing our monolith for better performance and maintainability.


What We're Looking For

* Proficiency in Ruby and experience with production systems involving machine learning, data pipelines, or decision engines.
* Comfortable working in complex domains; exposure to Python and ML concepts is a plus.
* Strong focus on system reliability, observability, and deployment best practices.
* Data-awareness, understanding data lifecycle and transformations.
* Excellent collaboration skills with cross-functional teams.


Our Tech Stack

Built as a Ruby on Rails monolith with a React Native frontend (TypeScript), leveraging Python for ML, PostgreSQL, hosted on AWS. We deploy multiple times weekly, with automated CI/CD pipelines, peer reviews, and ongoing refactoring towards modular architecture.


What You Get

* Competitive compensation (base + equity) with bi-annual reviews. Details here: https://cleo-ai.progressionapp.com/
* Opportunity to work at a high-growth, VC-backed startup.
* Clear career progression and growth support.
* Flexible work arrangements and a globally distributed team.
* Additional benefits including performance reviews, pay raises, equity top-ups, generous leave, pension, private insurance, parental leave, sabbaticals, social activities, OpenAI subscriptions, mental health support, workplace nursery, and more.

We encourage applications from diverse backgrounds and are committed to inclusivity. Please inform us of any accommodations needed.


UK App Access

The Cleo app is temporarily unavailable for download in the UK until next year, focusing on delivering value to users most in need, primarily in the US, with plans to support UK users again in the future.

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