Site Reliability Engineer

Job Overview

Trainline is a fast-growing tech company powering world-class digital journeys for millions of customers. Our platform runs primarily on AWS, built on cloud-native architecture, modern CI/CD pipelines, and strong DevOps and SRE practices. The Reliability & Operations Engineering team (ReliabilityOps) brings together SRE, Incident Management, and Database Reliability to keep our platform observable, reliable, scalable, and resilient. We partner closely with product engineering teams to enable safe delivery, respond to incidents, and continuously strengthen system reliability.

Key Responsibilities

• Developing an understanding of system architecture, dependencies, and failure modes across the Trainline platform
• Participating in production incident response, supporting investigation, mitigation, communication, and coordinated service restoration
• Contributing to post-incident reviews and follow-up actions to improve reliability, scalability, and resilience
• Taking part in the SRE on-call rotation
• Designing, building, and maintaining observability using metrics, logs, events, and traces to support effective detection and diagnosis
• Improving monitoring and alerting by aligning signals to business and customer impact, reducing noise and improving mean time to detection (MTTD)
• Ensuring relevant operational data is surfaced quickly and clearly during live incidents
• Making informed tooling and technology choices using SRE principles, balancing team and business needs
• Supporting AWS-hosted infrastructure and shared platform services using infrastructure-as-code and CI/CD tooling
• Collaborating with product engineering teams to ensure services are operationally ready and deployed safely
• Advising on reliability and resilience practices
• Writing and maintaining reliable, well-structured code and scripts to support reliability and observability goals
• Prioritising work effectively and collaborating using agile processes to deliver against team and business goals

Our Tech Stack

• AWS
• New Relic
• ELK stack
• Grafana
• Incident.io
• Docker, ECS
• Terraform
• Github Actions

Required Qualifications

• Experience of SRE concepts such as SLI, SLO and error budgets
• Hands-on experience with observability tooling such as New Relic, Elastic (ELK Stack), Influx, Grafana or similar
• Experience working with cloud providers (preferably AWS)
• Experience troubleshooting Linux operating systems
• Experience of scripting in at least one language (preferably Python)
• Understanding of load balancing and reverse proxy concepts, upstream config concepts, upstream health checks, worker & data flow concepts
• Experience building, maintaining and evolving time series data, retention, cardinality, deviation, moving averages and other functions
• Experience with build, deployment & configuration management tooling such as GitHub Actions and Terraform

About Trainline

We are champions of rail, inspired to build a greener, more sustainable future of travel. 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. Now Europe's number 1 downloaded rail app, with over 125 million monthly visits and £5.9 billion in annual ticket sales, we collaborate with 270+ rail and coach companies in over 40 countries.

Benefits

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. We operate a hybrid model to work 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 represent the things that matter most to us and what we live and breathe everyday, in everything we do:

• 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.