Junior Engineer - Ruby (London)

About us

We are champions of rail, inspired to build a greener, more sustainable future of travel. Trainline enables millions of travellers to find and book the best value tickets across carriers, fares, and journey options through our highly rated mobile app, website, and B2B partner channels. 

Great journeys start with Trainline 🚄 

Now Europe’s number 1 downloaded rail app, with over 125 million monthly visits and £5.9 billion in annual ticket sales, we collaborate with 270+ rail and coach companies in over 40 countries. We want to create a world where travel is as simple, seamless, eco-friendly and affordable as it should be. 

Today, we're a FTSE 250 company driven by our incredible team of over 1,000 Trainliners from 50+ nationalities, based across London, Paris, Barcelona, Milan, Edinburgh and Madrid. With our focus on growth in the UK and Europe, now is the perfect time to join us on this high-speed journey. 

Join Trainline’s Backend Engineering Team
At Trainline, we’re building Europe’s leading travel platform, helping millions of people move seamlessly across borders every day. Our Backend teams are at the heart of this, powering journey search, fares, bookings, payments, and real-time travel updates for customers across 45 countries.
We believe in collaboration, learning, and growth. Whether you’re early in your career or looking to take your next step as a developer, you’ll be joining a supportive environment where your ideas are valued and your skills can flourish.

About The Role
As a Junior Ruby Engineer, you’ll contribute to the systems that power millions of journeys across Europe. You’ll work alongside experienced engineers who will mentor and support your growth while helping you build confidence in modern backend engineering practices.

This is a fantastic opportunity to develop your skills, learn at scale, and make meaningful contributions to a product used by millions.

As a Junior Ruby Engineer at Trainline, you will...

• Contribute to backend features that power search, booking, payments, and real-time travel updates for millions of travellers across Europe.

• Write clean, reliable, and well-tested Ruby code, following engineering best practices to ensure performance and maintainability.

• Take part in code reviews and technical discussions, learning from others while sharing your ideas and feedback.

• Build your understanding of modern engineering practices, including automated testing, CI/CD, monitoring, and deploying services at scale.

• Collaborate closely with Product and Design to turn customer needs into scalable, high-quality solutions.

• Take ownership of well-defined tasks, gradually growing your responsibility and impact as your confidence and skills develop.

We'd love to hear from you if you...

• Excited to grow your career as a software engineer and motivated to continuously develop your skills

• Enjoy solving problems and learning new technologies

• Have hands-on coding experience (university, internships, or personal projects)

• Hold a degree in Computer Science or a related field, or equivalent practical experience

• Working knowledge of Ruby and object-oriented programming principles.

• Understanding of RESTful APIs and backend fundamentals

• Experience using Git for version control

• Basic knowledge of relational databases such as PostgreSQL

• Awareness of testing practices, CI/CD, Docker, or AWS is a plus, with a strong willingness to learn

More information:

Enjoy fantastic perks like private healthcare & dental insurance, a generous work from abroad policy, 2-for-1 share purchase plans, an EV Scheme to further reduce carbon emissions, extra festive time off, and excellent family-friendly benefits. 

We prioritise career growth with clear career paths, transparent pay bands, personal learning budgets, and regular learning days. Jump on board and supercharge your career from day one! 

We're operate a hybrid model to work and ask that Trainliners work from the office a minimum of 60% of their time over a 12-week period. We also have a 28-day Work from Abroad policy.

Our values represent the things that matter most to us and what we live and breathe everyday, in everything we do: 

• 💭 Think Big - We're building the future of rail 

• ✔️ Own It - We focus on every customer, partner and journey 

• 🤝  Travel Together - We're one team 

• ♻️ Do Good - We make a positive impact 

We know that having a diverse team makes us better and helps us succeed. And we mean all forms of diversity - gender, ethnicity, sexuality, disability, nationality and diversity of thought. That's why we're committed to creating inclusive places to work, where everyone belongs and differences are valued and celebrated.

Interested in finding out more about what it's like to work at Trainline? Why not check us out on LinkedIn, Instagram and Glassdoor!