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# AI Engineer - Ruby on Rails

- **Company:** Hola España! Cleo
- **Location:** Barcelona, Spain (Remote available)
- **Salary:** €30,000.0 - €42,800.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Agile Methodology, Amazon Web Services, Business Logic, Automation of Tests, Databases, Continuous Integration, Python (Programming Language), PostgreSQL, Machine Learning, Ruby on Rails, Ruby, Software Deployment, TypeScript, Circleci, Backend, Heroku, React Native, Front End Software Development, Microservices
- **Published:** July 17, 2026
- **Apply:** https://www.adzuna.es/contact-us.html

## About the Role

You are passionate about making a positive difference in society by improving the financial health of our users. You align with our company values and engineering principles, which drive our ways of working and software delivery.

## Description

Joining a cross-functional product squad and collaborating with a mix of engineers, designers, analysts and other disciplines to develop features that enhance our users' financial health.
Collaborating with other peers in your squad and pillar to provide technical insight into upcoming work, and leading the delivery by helping pull everyone together to get it shipped.
Mentoring colleagues to help them grow as engineers and actively supporting their development.
Working on our Ruby on Rails monolith, building data models, APIs, and business logic services.
Delivering your work using agile methodologies and tools like tests, observability, AB-tests, and feature flags.
Contributing to cross-cutting concerns that improve our engineering efforts.
Taking part in shaping the work of your squad beyond technical aspects, participating in product ideation, user research, design reviews, retrospectives, and more.
Here are some examples, big and small, of the kinds of product feature work our engineers have taken part in over the last year:
Building a secured credit card
Launching new budget analysis features
implementing pricing experiments for subscriptions
Want to hear more from our engineers? Check out Magda's blog post.
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 Heroku. Our backend engineers deploy multiple times a week, and we release our frontend app to Google and Apple for review at least once a week.
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.


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