At a Glance
- Tasks: Lead the development of a new React Native app for iOS and Android.
- Company: Join a forward-thinking tech company focused on accessible rail travel.
- Benefits: Enjoy 25 days holiday, free flu jab, and a supportive work environment.
- Other info: High autonomy role with excellent career growth and a commitment to inclusivity.
- Why this job: Make a real impact in transport tech while working with cutting-edge tools.
- Qualifications: 6+ years in mobile engineering with strong React Native and TypeScript skills.
The predicted salary is between 65000 - 80000 £ per year.
Accessible rail travel depends on systems that work reliably in live environments. Our Passenger Assistance platform turns passenger assistance requests into coordinated action inside live rail operations. We’re hiring a Senior Mobile Engineer to architect, own and ship a greenfield React Native product for iOS and Android alongside our Ruby on Rails engineers.
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 1.8 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 and establish a scalable development environment across iOS, Android, and our backend platform.
Outcomes & Impact
Within 6 months, you will:
- 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.
Within 12 months, you will:
- 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.
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.
This high-autonomy role suits an engineer comfortable defining what to build, designing the system, and delivering it—not simply implementing prescribed solutions.
The Tech Environment: Target Stack
- React Native (TypeScript)
- React Navigation
Backend & Delivery Context
- 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.
Requirements
Must Haves:
- 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 communication 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.
25 days holiday. Free flu jab for you and your family.
We value: Clarity over bureaucracy. We operate with high autonomy and high accountability. People are expected to raise risks early, communicate clearly, and take responsibility for outcomes.
Interview Roadmap:
- Screening Call (30 mins)
- Technical Architecture Discussion – Greenfield React Native and backend integration deep dive
- Final Culture Conversation – Leadership alignment
We’re a Disability Confident employer and we welcome applications from disabled candidates. If you need any adjustments at any stage of the recruitment process, please tell us what would help - we’ll work with you to make the process as accessible as possible. We also offer a Guaranteed Interview Scheme (GIS) for candidates who consider themselves to have a disability as defined under the Equality Act 2010. If you indicate this option in your application and your application demonstrates that you meet the essential criteria for the role, you’ll be invited to interview or assessment. Choosing GIS doesn’t guarantee a job offer. If you have any questions, please get in touch.
Senior Mobile Engineer (React Native) in London employer: Transreport
Transreport is an excellent employer that fosters a dynamic and inclusive work culture, where creativity and innovation are highly valued. As a Social Media Intern, you will have the opportunity to develop your skills in a supportive environment while contributing to meaningful projects that enhance accessibility in rail travel. With a focus on employee growth and development, Transreport offers unique advantages such as hands-on experience in social media strategy and the chance to make a real impact in the community.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Mobile Engineer (React Native) in London
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at Transreport or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to Transreport.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like Transreport.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like Transreport that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Senior Mobile Engineer (React Native) in London
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at Transreport.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Transreport and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at Transreport
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If Transreport uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
