Senior Engineer - Platform

Trainline; Greater London; Hybrid; GBP 80,000 - 90,000; Full time

Benefits offered by this job

Private healthcare

Dental insurance

Work from abroad policy

2-for-1 share purchase plans

EV scheme

Job summary

Trainline is seeking a Senior Platform Engineer to join the Atlas team in a hybrid role. You will deliver scalable and secure infrastructure using Terraform and AWS, while building automation in Node.js or Python and mentoring peers.

We value independent problem solving, collaboration across teams, and a strong focus on security, reliability and automation in a large-scale cloud environment. Hybrid work from our London-area offices is supported.

Qualifications

• Strong experience with AWS services such as ECS, Lambda, IAM or CloudFront.
• Proven experience delivering infrastructure changes using Terraform.
• Ability to work independently on complex platform engineering problems while collaborating with others.
• Experience using Node.js or Python for automation.
• Good understanding of secure cloud design including least privilege.
• Experience using AI tooling to support engineering work.
• A track record of delivering outcomes in agile delivery-focused teams.
• Helpful experience with multi-account or multi-region AWS management, CDN, WAF or enterprise-scale environments.

Responsibilities

• Deliver complex improvements to Trainline’s engineering platforms to enable scalable, reliable infrastructure.
• Implement and evolve infrastructure changes using Terraform with maintainability in mind.
• Apply least-privilege and secure-by-default practices across AWS accounts.
• Build automation scripts using Node.js or Python to enable faster, safer delivery.
• Support and review mid-level engineers, giving feedback and guidance.
• Collaborate with Tech Leads, Delivery Managers and stakeholders to plan and execute milestones.
• Identify risks early and help unblock delivery in a sustainable way.
• Test, validate and deploy changes through CI/CD pipelines with robust documentation.

Skills

AWS

Terraform

Node.js

Python

CI/CD

Security best practices

Agile delivery

Multi-account AWS mgmt

Tools

AWS services (ECS, Lambda, IAM, CloudFront)

Terraform

Node.js

Python

CI/CD tooling

Job description

About us

At Trainline, our purpose is to empower greener travel choices, connecting people and places. 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

We’re Europe’s leading independent rail platform, helping millions of travellers find and book the best-value rail and coach journeys across our app, website and partner channels.

Our job is to make the green travel choice the best choice. By building a better train travel experience, we help more people choose rail - creating a positive impact for customers, our business and the planet.

We’re a team of more than 1,000 Trainliners from over 50 nationalities, working across London, Paris, Barcelona, Milan, Edinburgh and Madrid. Now is a brilliant time to join us and help shape the future of travel.

Introducing the Infrastructure Engineering and Tooling team aka Atlas at Trainline

The Infrastructure Engineering and Tooling team, also known as Atlas, owns the ecosystem used to deploy, run and manage traffic across the Trainline platform. The team is currently building the next version of Trainline’s infrastructure platform, with a focus on reliability, quality, automation and secure, scalable delivery.

You will join a collaborative team made up of software engineers and platform engineers across a range of experience levels. The team works across technologies including Terraform, AWS, Node.js, C# and Python, but we do not expect you to know everything from day one. In this role, you will work closely with engineers, Tech Leads, Engineering Managers, Senior Principal and a Head of Engineering to improve our platform and deliver meaningful infrastructure change.

In this role as the Senior Platform Engineer

• Deliver complex improvements to Trainline’s engineering platforms, helping us build scalable, reliable and secure infrastructure that supports teams across the business.
• Implement and evolve infrastructure changes using Terraform, following existing module patterns while identifying opportunities to improve quality, maintainability and automation.
• Apply least-privilege and secure-by-default principles consistently across AWS accounts, helping ensure our infrastructure meets Trainline’s standards for security and operational excellence.
• Build or contribute to automation scripts and tooling using Node.js or Python, supporting faster, safer and more repeatable delivery.
• Support and review the work of mid-level engineers, sharing context, providing constructive feedback and helping others deliver confidently.
• Collaborate with Tech Leads, Delivery Managers and cross-functional stakeholders to shape delivery plans, achieve milestones and manage dependencies.
• Identify risks, blockers or quality concerns early, helping to unblock the team and keep delivery moving in a clear and sustainable way.
• Test, validate and deploy infrastructure changes through CI/CD pipelines, ensuring deliverables are robust, well-documented and production ready.

We'd love to hear from you if you have

• Strong experience working with AWS services such as ECS, Lambda, IAM or CloudFront, with a solid understanding of operational and security best practice.
• Proven experience delivering infrastructure changes using Terraform, ideally in complex or large-scale cloud environments.
• The ability to work independently on complex platform engineering problems while bringing others along through clear communication and collaboration.
• Experience using Node.js or Python for automation, scripting or integration work, with a focus on practical, maintainable solutions.
• A good understanding of secure cloud design, including least privilege, account structure and service-to-service authentication approaches such as OIDC.
• Experience using AI tooling to support day-to-day engineering work, such as coding, code review, research or productivity improvements.
• A track record of delivering outcomes in agile, delivery-focused teams, with the confidence to raise risks, clarify priorities and support shared progress.
• Helpful experience with areas such as multi-account or multi-region AWS management, CDN, WAF, Git-based CI/CD pipelines or enterprise-scale AWS environments.

More information

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. Jump on board and supercharge your career from day one!

We’re operating a hybrid model 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.

Interested in finding out more about what it's like to work at Trainline? Why not check us out on LinkedIn, Instagram and Glassdoor!

Compensation: £80K – £90K

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