Senior Backend Engineer - .Net

Trainline; London (KY); Hybrid; USD 93,000 - 146,000; Full time

Benefits offered by this job

Private healthcare

Dental insurance

Work from abroad policy

2-for-1 share purchases

EV scheme

Extra festive time off

Family-friendly benefits

Job summary

Trainline is hiring a Senior .NET Engineer to shape backend architecture, mentor engineers, and own features from code to production in a scalable platform environment.

Ideal candidates have strong C#/.NET skills, experience with microservices, AWS, and observability tools, and comfort with CI/CD pipelines. This role supports a hybrid work model from London with a focus on reliability and performance.

Qualifications

• Strong hands-on C# and .NET experience, including recent features.
• Built and run microservices and event-driven systems with distributed systems and scale.
• Familiar with AWS and CI/CD pipelines; Terraform and observability tooling.

Responsibilities

• 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.

Skills

C# / .NET

Team collaboration

Distributed systems

Observability

AI curiosity

Tools

AWS

Docker

Terraform

PostgreSQL

DynamoDB

GitHub Actions

New Relic

ELK

Job description

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)
• 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

• 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!