Site Reliability Engineer

Salary: £65,000 - 105,000 per year

Requirements:

• We have solid production experience and a growth mindset, with a willingness to challenge and be challenged.
• We understand SRE concepts such as SLI, SLO, and error budgets.
• We have hands-on experience with observability tooling such as New Relic, Elastic (ELK Stack), Influx, Grafana, or similar.
• We have experience working with cloud providers, preferably AWS.
• We have experience troubleshooting Linux operating systems.
• We can script in at least one language, preferably Python.
• We understand load balancing and reverse proxy concepts, upstream configuration, upstream health checks, worker and data flow concepts.
• We understand application architecture concepts such as threading, queuing, readiness checks, health checks, circuit breakers, timeouts, exponential backoff, and throttling.
• We have experience building, maintaining, and evolving time series data, retention, cardinality, deviation, moving averages, and related functions.
• We have experience with build, deployment, and configuration management tooling such as GitHub Actions and Terraform.

Responsibilities:

• We develop an understanding of system architecture, dependencies, and failure modes across our platform.
• We participate in production incident response, supporting investigation, mitigation, communication, and coordinated service restoration.
• We contribute to post-incident reviews and follow-up actions to improve reliability, scalability, and resilience.
• We take part in our SRE on-call rotation.
• We design, build, and maintain observability using metrics, logs, events, and traces to support effective detection and diagnosis.
• We improve monitoring and alerting by aligning signals to business and customer impact, reducing noise, and improving mean time to detection.
• We ensure relevant operational data is surfaced quickly and clearly during live incidents.
• We make informed tooling and technology choices using SRE principles, balancing team and business needs.
• We support AWS-hosted infrastructure and shared platform services using infrastructure as code and CI/CD tooling.
• We collaborate with product engineering teams to ensure services are operationally ready and deployed safely.
• We advise on reliability and resilience practices.
• We write and maintain reliable, well-structured code and scripts to support reliability and observability goals.
• We prioritise work effectively and collaborate using agile processes to deliver against team and business goals.

Technologies:

• AWS
• CI/CD
• Cloud
• ELK
• Flow
• GitHub
• Grafana
• Incident Management
• Support
• Linux
• Load Balancing
• Python
• Terraform
• DevOps
• Mobile

More:

We are Trainline, a fast-growing tech company and Europes number 1 downloaded rail app, helping millions of travellers find and book the best-value rail and coach tickets through our app, website, and B2B partner channels. We collaborate with 270+ rail and coach companies in over 40 countries and are powered by a team of over 1,000 people across London, Paris, Barcelona, Milan, Edinburgh, and Madrid. Our Reliability & Operations Engineering team brings together SRE, Incident Management, and Database Reliability to keep our platform observable, reliable, scalable, and resilient. We offer a hybrid working model with a minimum of 60% office time over a 12-week period, a 28-day work-from-abroad policy, private healthcare and dental insurance, a generous work-from-abroad policy, a 2-for-1 share purchase plan, an EV scheme, extra festive time off, family-friendly benefits, transparent pay bands, personal learning budgets, and regular learning days. Our values are Think Big, Own It, Travel Together, and Do Good, and we are committed to building an inclusive workplace where everyone belongs.

last updated 34 week of 2026