Fynity
Senior Mobile Engineer
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Senior Mobile Engineer (React Native)
London (Hybrid – 2 days per week, with flexibility)
Up to £70,000 + Excellent Benefits
The Opportunity:
I'm currently supporting an award-winning, tech-for-good SaaS business that is looking for a Senior Mobile Engineer to lead the development of a brand-new React Native application.
This is a genuine greenfield opportunity. Rather than joining an established mobile team, you'll take ownership of the mobile platform from day one, shaping the architecture, technical direction and engineering standards as the product evolves.
The business develops technology that delivers real-world impact at scale, with platforms relied upon by hundreds of thousands of users every year. Their engineering culture is highly collaborative, ownership-driven and forward-thinking, embracing modern AI-assisted engineering practices to help developers work smarter and focus on solving meaningful technical challenges.
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Working alongside an experienced Ruby on Rails engineering team, you'll design and build a cross-platform React Native application that will become a key part of the company's next phase of growth.
What you'll be doing:
As the Senior Mobile Engineer, you'll own the end-to-end delivery of a new React Native application, helping define both the technical architecture and the engineering practices around it.
Responsibilities include:
- Architecting and building a greenfield React Native application for iOS and Android.
- Establishing scalable engineering standards, testing strategy and CI/CD practices.
- Working closely with backend Ruby on Rails engineers to design API contracts and seamless integrations.
- Taking ownership of technical decisions around performance, scalability, accessibility and maintainability.
- Collaborating with Product and Design to translate product goals into technical delivery.
- Identifying risks, managing technical debt and helping shape the long-term roadmap for the mobile platform.
- Driving engineering quality whilst remaining hands-on throughout development.
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About you
You'll ideally have:
- Strong commercial experience developing React Native applications using TypeScript.
- Experience architecting and delivering production mobile applications.
- Confidence owning technical decisions from design through to release.
- Experience working with APIs and backend integrations.
- Strong understanding of mobile performance, testing and application lifecycle management.
- Excellent communication skills and the ability to work collaboratively across Engineering, Product and Design.
- Confidence using modern AI-assisted development tools to improve engineering productivity and code quality.
Experience working with B2B SaaS products or high-availability production environments would be beneficial, although not essential.
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