React Native Engineer

We're hiring a Senior Mobile Engineer to lead greenfield builds and complex migrations across our real-time rail mobile systems.

Strategic Context

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

We operate across the UK, Japan, and the EU and have supported over 10 million assistance requests for more than 1 million users. We are a Series A company recognised with a King's Award.

As we scale internationally, this role will lead the development of a React Native application to support evolving B2B requirements while modernising our Android platform and strengthening cross-platform alignment.

Outcomes & Impact

Within 6 months, you will:

• Architect and launch the first production version of our new B2B React Native application.
• Provide reliable senior-level cover for the Kotlin Android codebase.
• Establish clear migration principles for introducing React Native into an existing native environment.
• Build trust across Data, Product, and Mobile teams as a technical bridge.

Within 12 months, you will:

• Deliver a phased migration roadmap from monolithic native Android to React Native.
• Reduce platform risk while increasing cross-platform feature parity.
• Introduce measurable performance improvements in mobile stability and delivery velocity.
• Influence long-term mobile architecture decisions across the organisation., * Architect & Build - Design and ship a new React Native B2B application from scratch using TypeScript, React Navigation, and modern animation libraries. You will define architectural standards and ensure scalability from day one.
• Maintain & Stabilise - Provide senior-level coverage for the existing Kotlin Android application (Clean Architecture, MVVM). Ensure stability for both staff-facing and passenger-facing applications operating in live rail environments.
• Strategise Migration - Formulate and execute a safe, phased plan to deconstruct the existing monolithic Android app and rebuild functionality in React Native without disrupting current operations.
• Bridge Native & Cross-Platform - Write native modules where necessary and ensure high-performance interop between Kotlin and JavaScript/TypeScript using the React Native Bridge and JSI.
• Cross-Team Alignment - Work closely with the Swift/iOS engineer to ensure migration plans align with iOS architecture and roadmap priorities. Collaborate with Data and Product teams to balance commercial speed with platform stability.

This is a high-context-switching role requiring strong autonomy and decision-making capability.

The Tech Environment:

Target Stack

• React Native (TypeScript)
• React Navigation
• Reanimated

Legacy / Native Stack

• 100% Kotlin
• Android SDK 24-34
• Jetpack
• Coroutines (Flows/Channels)
• Koin (Dependency Injection)
• MockK
• Gradle Kotlin DSL

You are not expected to know every tool immediately, but you must be comfortable operating deeply in both native Android and cross-platform React Native ecosystems.

Must Haves

• 6+ years of mobile engineering experience.
• Senior-level Kotlin expertise, including Clean Architecture, MVVM, DI (Koin/Dagger), and Coroutines/Flow.
• Strong React Native experience beyond UI - including native modules, Bridge/JSI, and performance optimisation.
• Experience integrating React Native into an existing native Android codebase (brownfield experience).
• Proven experience architecting or significantly contributing to mobile platform migrations.
• Comfortable making architectural trade-offs in high-risk, live environments.
• Ability to manage ambiguity and switch context between greenfield and legacy projects.
• Strong communication skills and experience working in remote, cross-functional teams.

Nice to Haves:

• Experience migrating from fully native apps to cross-platform solutions.
• Experience in transport, logistics, or regulated industries.
• Familiarity with performance profiling tools on Android.
• Experience working in B2B SaaS environments.
• Exposure to Swift/iOS architecture (even if not hands-on)., Job Description We are looking for an exceptional Frontend Engineer with raw, hands-on React Native expertise to join one of the fastest growing crypto exchanges world-wide. If you love solving complex mobile challenges, building smooth high-performance apps, and working..., A leading financial technology firm in the UK is seeking a Staff Engineer (Mobile) to develop its flagship wallet platform. The ideal candidate will have strong expertise in mobile development using React Native and TypeScript, along with a passion for creating exceptional..., An innovative tech recruiting firm is seeking a Mobile Engineer to lead the mobile experience of a rapidly growing music creation platform. The ideal candidate should be an expert in React Native with a proven track record of shipping apps on both iOS and Android. This...

• Private healthcare after your probation (including children)
• Hybrid working model
• 25 days holiday
• Volunteering Leave
• Free flu jab for you and your family

Culture & Operating Principles

We value:

• Ownership over hierarchy
• Clarity over bureaucracy
• Impact over job titles

We operate with high autonomy and high accountability. People are expected to raise risks early, communicate clearly, and take responsibility for outcomes.

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