Senior Mobile Architect (React Native) - Greenfield B2B App

Transreport; Greater London; On-site; GBP 110,000 - 140,000; Full time

Benefits offered by this job

25 days holiday

Free flu jab for you and your family

Job summary

Transreport is hiring a Senior Mobile Engineer to architect and own a greenfield React Native product for iOS and Android, alongside Rails engineers. You will define architecture, establish CI/CD, and set a scalable mobile/backend boundary in a fast-growing UK-based platform serving rail operations.

The role requires leadership, deep RN/TypeScript expertise, and a proven track record shipping native apps. Expect high autonomy, cross-functional collaboration, and a pathway to shaping mobile

Qualifications

• 6+ years of mobile engineering experience.
• Deep React Native and TypeScript expertise across 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.
• Experience establishing a development environment and technical direction from scratch.
• Comfortable explaining trade-offs between delivery speed, product needs, and maintainability.
• Ability to manage ambiguity, own multiple verticals, and move between architecture and hands-on delivery.
• Strong communications skills, proactively surfacing delivery confidence, risks, dependencies, and technical debt.
• Experience collaborating with Ruby on Rails or similar backend teams.
• Experience in transport, logistics, or regulated industries.
• Familiarity with mobile observability, performance profiling, testing, and app-store releases.
• Experience working in B2B SaaS environments.
• Exposure to native iOS and Android development.

Responsibilities

• 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 workstreams 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.

Skills

Mobile engineering

React Native

TypeScript

Architecture

Delivery

Communication

Technical leadership

Problem solving

Tools

Ruby on Rails

Job description

Transreport is hiring a Senior Mobile Engineer to architect and own a greenfield React Native product for iOS and Android, alongside Rails engineers. You will define architecture, establish CI/CD, and set a scalable mobile/backend boundary in a fast-growing UK-based platform serving rail operations.

The role requires leadership, deep RN/TypeScript expertise, and a proven track record shipping native apps. Expect high autonomy, cross-functional collaboration, and a pathway to shaping mobile