Trainline
Site Reliability Engineer
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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.
Great journeys start with Trainline 🚄 Now Europe’s number 1 downloaded rail app, with over 135 million monthly visits and £6.3 billion in annual ticket sales, we collaborate with 270+ rail and coach companies in over 40 countries. We want to create a world where travel is as simple, seamless, eco-friendly, and affordable as it should be.
Today, we're a FTSE 250 company driven by our incredible team of over 1,000 Trainliners from 50+ nationalities, based across London, Paris, Barcelona, Milan, Edinburgh, and Madrid. With our focus on growth in the UK and Europe, now is the perfect time to join us on this high-speed journey.
Introducing Reliability & Operations Engineering
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.
Site Reliability Engineer (Mid-Level)
We’re looking for a middle-level Site Reliability Engineer to help drive forward SR&Ops. You’ll bring solid production experience, a growth mindset, and willingness to challenge and be challenged—contributing to platform reliability while developing technical ownership with support from senior engineers.
Key Responsibilities
As an SRE at Trainline, you'll help...
- Develop an understanding of system architecture, dependencies, and failure modes across the Trainline platform.
- Participate in production incident response, assisting with 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 to support effective detection and diagnosis.
- Improve monitoring and alerting by aligning signals to business and customer impact, reducing noise, and improving mean time to detection (MTTD).
- Ensure relevant operational data surfaces quickly and clearly during live incidents.
- Make informed tooling and technology choices using SRE principles, balancing team and business needs.
- 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.
- Advise on reliability and resilience practices.
- Write and maintain reliable, well-structured code and scripts to support:
- reliability, and
- observability goals.
- Prioritise work effectively and collaborate using agile processes to deliver against team and business goals.
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Our Tech Stack
- AWS
- New Relic
- ELK Stack
- Grafana
- Incident.io
- Docker, ECS
- Terraform
- GitHub Actions
Requirements
We’d love to hear from you if you have...
- Hands-on experience with:
- SRE concepts such as SLIs, SLOs, and error budgets.
- Observability tooling like:
- New Relic or Elasticsearch (ELK Stack),
- Influx, or
- similar.
- Working with cloud providers (preferably AWS).
- Troubleshooting Linux operating systems.
- Scripting in at least one language (preferably Python).
- Load balancing and reverse proxying:
- Upstream config concepts,
- Upstream health checks,
- Worker/data flow concepts.
- Understanding of application architecture concepts:
- Threading,
- Queuing,
- Readiness checks,
- Health checks,
- Circuit breakers,
- Timeouts,
- Exponential backoff,
- Throttling.
- Experience:
- Building, maintaining, and evolving time series data:
- cardinality,
- deviation,
- moving averages, etc.
- Using build, deployment & configuration management tooling:
- GitHub Actions or
- Terraform.
- Building, maintaining, and evolving time series data:
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Why Join Us?
Enjoy fantastic perks such as:
- Private healthcare and 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.
We prioritise career growth with:
- Clear career paths.
- Transparent pay bands.
- Personal learning budgets.
- Regular learning days.
Join Trainline and supercharge your career from day one!
How We Work
We operate a hybrid model, requiring Trainliners to 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 Core Values (The Things That Matter)
We live and breathe these values every day:
- ✨ 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.
Diversity Matters
We know diversity makes us better. We are committed to inclusive workplaces where everyone:
- Belongs,
- Differences are valued, and
- Celebrated.
This includes diversity of:
- Gender,
- Ethnicity,
- Sexuality,
- Disability,
- Nationality, and
- Diversity of thought.
Learn More about Us
Check us out on: 🔗 LinkedIn 📵 Instagram 🔍 Glassdoor!
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