Senior Backend Engineer – .Net

Trainline

Senior Backend Engineer developing core functionality for Trainline's services including eCommerce and journey search. Contributing to technical decisions and mentoring team members.

Posted 6/30/2026full-timeLondon • 🇬🇧 United KingdomSenior💰 £85,000 - £95,000 per yearWebsite

Tech Stack

Tools & technologies

AWSAzureCloudDistributed SystemsGoogle Cloud PlatformMicroservices.NETTerraform

About the role

Key responsibilities & impact

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

Requirements

What you’ll need

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

Benefits

Comp & perks

Private healthcare
Dental insurance
Generous work from abroad policy
2-for-1 share purchase plans
EV Scheme to further reduce carbon emissions
Extra festive time off
Excellent family-friendly benefits

ATS Keywords

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Hard Skills & Tools

C# .NETCI/CDInfrastructure as Code (Terraform)MicroservicesEvent-Driven SystemsObservability PracticesIdentity and Authentication SystemsAsynchronous Messaging PatternsDistributed SystemsScalability Challenges

Soft Skills

Excellent CommunicationMentoringCollaboration