Trainline
Senior Backend Engineer - .Net
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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 Trailine’s world-class product. We create:
- The journey search functionality used by millions daily
- The eCommerce platform for a secure and seamless experience
- Connections to over 270+ travel operating companies across 45+ countries
Our specialisms range from journey search, fares calculation, bookings, to fulfilment, payments, refunds, carrier integrations, real-time timetable information, and journey disruptions.
Senior .NET Engineer 🚄
Reader’s Responsibilities
As a senior-level .NET Engineer, 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 codebase
- Prioritise customer experience as our top focus
- Actively identify blockers, bottlenecks, time sinks, and waste—then remove them
- Contribute significantly to technical decision-making
- Act as coach and mentor to colleagues
- Take full ownership of the development lifecycle, including:
- Code to production deployment
- Monitoring and maintenance
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Our Tech Stack 🔑
- Languages & Frameworks: C# (.NET 6 to 10)
- Databases: DynamoDB, PostgreSQL
- Cloud & Infrastructure: AWS Cloud, Docker, Terraform
- CI/CD & DevOps: GitHub Actions
- Monitoring & Logging: New Relic, ELK Stack
Your Profile 🔍
We’d love to hear from you if you have experience in:
- Mentoring junior engineers and pair-programming
- Hands-on experience with C# .NET, including the latest features
- Collaboration with front-end engineers and cross-functional teams
- Working with identity and authentication systems (e.g., IdentityServer, OpenID Connect, OAuth2)
- Designing and maintaining CI/CD pipelines (e.g., GitHub Actions, TeamCity)
- Experience with cloud platforms (AWS preferred; Azure or GCP also valuable)
- Working with Infrastructure as Code, especially Terraform
- Strong observability practices (logging, monitoring, alerting tooling like New Relic/ELK)
- Curiosity about emerging technologies, like AI
- Supporting production systems and improving reliability
- Building and operating microservices architectures
- Experience with event-driven systems and async messaging patterns
- Understanding of distributed systems and scalability challenges
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Additionally:
- Excel at communicating with all levels of stakeholders
Benefits
Enjoy outstanding benefits, including:
- Access to private healthcare and dental insurance
- Generous “work from abroad” policy
- 2-for-1 share purchase plans
- Electric Vehicle (EV) Scheme to reduce carbon emissions
- Extra festive time off
- Excellent family-friendly offerings
We emphasise career growth, offering:
- Clear career paths and transparent pay bands
- Personal learning budgets
- Dedicated learning days
Work Environment
We operate a hybrid model, requiring a minimum of 60% on-site presence within any 12-week period. Additionally, we provide a 28-day Work from Abroad policy.
Our Values
We live and breathe the following principles:
- 💭 Think Big – Building the future of rail
- ✔️ Own It – Focus on every customer, partner, and journey
- 🤝 Travel Together – One united team
- ♻️ Do Good – Make a positive impact
Promoting Diversity
Diversity makes us stronger. We proudly stand behind inclusivity, celebrating all forms including gender, ethnicity, sexuality, disability, nationality, and diversity of thought. We’re committed to building places where everyone feels belonging and differences are valued.
Interested?
Ready to explore life at Trainline? Check our presence on LinkedIn, Instagram, and Glassdoor.
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