Senior Backend Engineer – .Net

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 135 million monthly visits and £6.3 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.

Introducing the Backend teams at Trainline👋

The Backend teams at Trainline build the core of Trainline’s world class product. We create the journey search functionality that millions of our customers use on a daily basis, the eCommerce platform that provides a secure and seamless experience and we connect Trainline to over 270 travel operating companies, across 45 countries in Europe and the rest of the world. Each team has a targeted domain focus, ranging between customer accounts and notifications, journey search, bookings, payments, carriers’ integrations, real-time timetable information, and much more.

As a Senior.NET Engineer at Trainline you will…🚄

• Deliver new functionality or features, using the most appropriate tools & techniques

• Ensure quality is at the heart of everything you and your team do

• Continuously improve the code base

• Keep our customer as the number one priority

• Actively identify blockers, boulders, time sinks and waste, and actively attempt to remove them

• Make significant contribution to technical decisions

• Act as a coach and mentor to others in the team

• Take full ownership of the development lifecycle from code to production, including deployment and monitoring

Our Tech Stack 🔑

• Languages & Frameworks: C# (.NET 6–10)

• Databases: DynamoDB, PostgreSQL

• Cloud & Infrastructure: AWS Cloud, Docker, Terraform

• CI/CD & DevOps: GitHub Actions

• Monitoring & Logging: New Relic, ELK Stack

We’d love to hear from you if you have…🔍

• Experience mentoring less experienced engineers and comfortable pair-programming with colleagues

• Hands on experience with C#.NET and the latest features

• Experience collaborating with front-end engineers and other disciplines to deliver end-to-end features and cross-functional epics

• Experience working with identity and authentication systems (e.g. IdentityServer, OpenID Connect, OAuth2)

• Experience designing and maintaining CI/CD pipelines (e.g. GitHub Actions, TeamCity, Spacelift or similar tools)

• Experience with cloud platforms (AWS preferred; Azure or GCP also valuable)

• Hands-on experience with Infrastructure as Code, particularly Terraform

• Strong experience with observability practices (logging, monitoring, alerting)

• Familiarity with tools such as New Relic and ELK stack (or equivalents)

• Curiosity about AI and emerging tools

• Experience supporting production systems and improving reliability

• Strong experience building and operating microservices architectures

• Experience with event-driven systems and asynchronous messaging patterns

• Solid understanding of distributed systems and scalability challenges

• Have excellent communication skills

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!