Senior Backend Engineer - .Net
Confirmed on the employer's own hiring board on Oct 24, 2026. First seen by Alion on Oct 22, 2026.
About us
At Trainline, our purpose is to empower greener travel choices, connecting people and places. 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
We’re Europe’s leading independent rail platform, helping millions of travellers find and book the best-value rail and coach journeys across our app, website and partner channels.
Our job is to make the green travel choice the best choice. By building a better train travel experience, we help more people choose rail - creating a positive impact for customers, our business and the planet.
We’re a team of more than 1,000 Trainliners from over 50 nationalities, working across London, Paris, Barcelona, Milan, Edinburgh and Madrid. Now is a brilliant time to join us and help shape the future of travel.
Introducing the Backend teams at Trainline
Trainline’s Backend teams build the core of our product: the journey search that millions of customers use daily, the eCommerce platform behind every booking, and integrations with 270+ travel operators across 45 countries. Each team owns a focused domain, from accounts and notifications to search, payments, carrier integrations and real-time timetables. We’re hiring for our Insurance team, which builds the protection that sits alongside the booking, like Trainline Flex and Trip Cover, so customers can travel with confidence and be prepared when plans change.
As a Senior .NET Engineer at Trainline you will...
Shape technical decisions and help the team make good ones
Coach and mentor other engineers, and learn from them too
Own your work from code through to production, including deployment and monitoring
Spot and remove blockers, time sinks and waste, for yourself and the team
Keep quality high and keep improving the codebase
Our Tech Stack...
C# (.NET 6 to 10), DynamoDB, PostgreSQL, AWS, Docker, Terraform, GitHub Actions, New Relic, ELK
You’ll be a great fit if you
Communicate clearly and enjoy working as part of a team, whether that’s pair-programming, mentoring or collaborating with front-end engineers and other disciplines
Have strong hands-on C# and .NET experience, including recent features
Have built and run microservices and event-driven systems, with a solid grasp of distributed systems and scale
Are comfortable with AWS (Azure or GCP also valuable), Terraform and CI/CD pipelines
Care about observability and keeping production reliable (New Relic, ELK or equivalents)
Have worked with identity and authentication (OAuth2, OpenID Connect, IdentityServer)
Are curious about AI and emerging tools
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 operating a hybrid model 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!