Senior Mobile Engineer; React Native

Accessible rail travel depends on systems that work reliably in live environments.

Our Passenger Assistance platform turns passengerassistancerequests into coordinated action inside live rail operations.

We’rehiring a Senior Mobile Engineer to architect, own and ship a greenfield React Native product for iOS and Android alongside our Ruby on Rails engineers.

Transreport exists to remove structural barriers in rail travel. Our vision is that everyone has access to travel everywhere.

Weoperateacross the UK, Japan, and the EU and have supported over 10 millionassistancerequests for more than 1.8 million users.

We are a Series A company recognised with a King’s Award.

As we scale internationally, this role will lead a new React Native application andestablisha scalable development environment across iOS, Android, and our backend platform.

• Architect and launch the first production version of our new B2B React Native application.
• Establish the greenfield architecture, testing, CI/CD, and release foundations for iOS and Android.
• Agree scalable API contracts and an integration strategy with our Ruby on Rails engineers.
• Build trust across Product, Design, and Engineering by surfacing timelines, risks, trade-offs, and technical debt early.

• Own the mobile roadmap across multiple product verticals, from technical design to production.
• Build a maintainable cross-platform foundation for fast, sustainable delivery.
• Introduce measurable improvements in mobile quality, stability, performance, and delivery velocity.
• Shape long-term mobile/backend integration and keep technical debt visible and manageable.

• Architect & Build
  - Define, own, and ship a greenfield React Native B2B application for iOS and Android. Set architectural standards that balance near-term delivery with long-term scalability.
• Own Delivery
  - Own multiple work streams in a small team, turning product goals into technical plans and carrying them through build, release, and iteration.
• Design for the Long Term -Make pragmatic greenfield architecture decisions, balancing delivery speed with maintainability, scalability, accessibility, and technical debt.
• Partner with Backend -Work with Ruby on Rails engineers to shape API contracts, data flows, authentication, observability, and a sustainable mobile/backend boundary.
• Technical Leadership -Proactively communicate timelines, delivery confidence, dependencies, risks, and trade-offs, helping Product and Engineering make informed scope decisions.

This high-autonomy role suits an engineer comfortable defining what to build, designing the system, and delivering it—not simply implementing prescribed solutions.

• React Native (Type Script)
• React Navigation

• Ruby on Rails APIs
• iOS and Android app delivery
• API contracts and mobile/backend integration
• Automated testing and CI/CD
• Mobile monitoring and performance optimisation
• App Store and Google Play release practices
• Security, accessibility, and maintainable engineering standards

You are not expected to know every tool immediately, but you must be comfortable owning architectural decisions across React Native and its backend integration.

• 6+ years of mobile engineering experience.
• Deep React Native and TypeScriptexpertiseacross architecture, testing, performance, and production delivery.
• Strong judgement about when React Native needs native platform capabilities or modules.
• Proven experience designing a greenfield system and shipping production iOS and Android applications.
• Experienceestablishinga development environment and technical direction from scratch.
• Comfortable explaining trade-offs between delivery…