Senior Backend Engineer - .Net
At a glance
Senior Backend Engineering role at Trainline. London · full-time · £85,000–£95,000 base.
techroles summary, based on the employer's posting.
What you'll do
- Build and ship backend features, choosing suitable tools and techniques while keeping customer needs central
- Raise quality across your team and improve the codebase as you work
- Take changes from implementation through release, deployment and production monitoring
- Shape technical choices, coach teammates and pair with other engineers
- Spot delays and waste in the workflow, then work to remove them
What you bring
- You have hands-on C# and .NET experience, including familiarity with recent features
- You have mentored junior engineers and can pair with colleagues
- You have built and run microservices, with experience in distributed systems and asynchronous, event-driven designs
- You have worked with cloud infrastructure and Terraform, plus production monitoring and reliability practices
Who this fits
This senior role suits an engineer who contributes to technical decisions, mentors teammates and owns work through production. You’ll work hybrid from London, with at least sixty percent of your time in the office over each twelve-week period.
From the employer
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👋
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 journey search, fares calculation, bookings, fulfilment, payments, refunds, carriers’ integrations, real-time timetable information, journey disruptions and much more.
As a senior level .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!
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