Site Reliability Engineer

Stack

Responsibilities

• ▹Develop understanding of system architecture, dependencies and failure modes across the Trainline platform
• ▹Participate in production incident response: investigation, mitigation, communication and coordinated service restoration
• ▹Contribute to post-incident reviews and follow-up actions to improve reliability, scalability and resilience
• ▹Take part in the SRE on-call rotation
• ▹Design, build and maintain observability using metrics, logs, events and traces
• ▹Improve monitoring and alerting by aligning signals to business and customer impact, reducing noise
• ▹Support AWS-hosted infrastructure and shared platform services using infrastructure-as-code and CI/CD tooling
• ▹Collaborate with product engineering teams to ensure services are operationally ready and deployed safely
• ▹Write and maintain reliable, well-structured code and scripts to support reliability and observability goals

Requirements

• ▹Experience with SRE concepts such as SLI, SLO and error budgets
• ▹Hands-on experience with observability tooling such as New Relic, Elastic (ELK Stack), InfluxDB, Grafana or similar
• ▹Experience working with cloud providers (preferably AWS)
• ▹Experience troubleshooting Linux operating systems
• ▹Experience scripting in at least one language (preferably Python)
• ▹Understanding of load balancing and reverse proxy concepts, upstream config, upstream health checks, worker and data flow concepts
• ▹Understanding of application architecture concepts (threading, queuing, readiness checks)
• ▹Tech stack: AWS, New Relic, ELK Stack, Grafana, Incident.io, Docker, ECS, Terraform, GitHub Actions

About the company

Trainline is Europe's number 1 downloaded rail app, enabling millions of travellers to find and book the best value tickets across carriers, fares and journey options via its mobile app, website and B2B partner channels. The FTSE 250 company partners with over 270 rail and coach companies in more than 40 countries and employs over 1,000 people from 50+ nationalities across offices in London, Paris, Barcelona, Milan, Edinburgh and Madrid.