Top Tech Jobs & Startup Jobs in London

As a .NET Engineer at Trainline, you will develop features, ensure code quality, mentor team members, and manage the development lifecycle.

Join Trainline as a mid-level Site Reliability Engineer to improve platform reliability and observability, participate in incident response and on-call rotation, build and maintain monitoring/alerting, support AWS-hosted infrastructure using IaC and CI/CD (Terraform, GitHub Actions), collaborate with product teams, and write scripts and tooling to improve reliability and scalability.

Build and improve Trainline's infrastructure platform using Terraform and AWS, automate tasks with Node.js/Python, apply secure-by-default principles, test and deploy via CI/CD, collaborate with platform and engineering stakeholders, and deliver reliable, maintainable infrastructure changes.

The Senior Backend Engineer will develop features, improve code quality, mentor others, and manage the development lifecycle while focusing on customer priorities and technical decisions.

Design, build and operate backend services in C#/.NET; own full development lifecycle, mentor teammates, improve reliability, observability, CI/CD, and scale microservices across AWS.

Design, implement and improve Trainline's infrastructure platform using Terraform and AWS. Build automation and tooling in Node.js or Python, enforce secure-by-default cloud patterns, test and deploy via CI/CD, mentor mid-level engineers, collaborate across teams, and manage multi-account, multi-region, and enterprise-scale platform concerns to deliver reliable, scalable infrastructure.

Lead strategy and operations for Trainline's New Verticals (Hotels and Car Hire). Translate strategy into roadmaps, run end-to-end programmes, manage risks and dependencies, build governance and leadership reporting, and coordinate cross-functional stakeholders to deliver multi-party product launches and feature rollouts.

Senior technical lead for Workplace Technology providing Tier 2/3 support, mentoring engineers, owning complex incidents, managing MacOS/Windows device estates (JAMF, Intune/Autopilot), Azure AD/M365 administration, AV/VC systems, security/compliance contributions, documentation, process improvement and runbook automation. Responsible for incident lifecycle, root cause analysis, access governance, asset/on-offboarding, and driving team standards.

Senior finance leader owning Group IFRS external reporting, leading year‑end and half‑year audits, producing listed financial statements, and managing subsidiary statutory filings. Acts as technical accounting authority on complex IFRS issues, owns cashflow forecasting and liquidity analysis, drives controls and accounting policy, leads cross‑functional projects, and develops a high‑performing finance team.

Design, build and productionise machine learning models end-to-end within cross-functional teams. Lead architectural decisions, mentor engineers, create ML tooling and frameworks, and partner with stakeholders to deliver impactful data products at scale.