> Markdown version of [/jobs/ext/351248-principal-software-engineer-mobile-react-native](https://www.wearedevelopers.com/jobs/ext/351248-principal-software-engineer-mobile-react-native). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Software Engineer, Mobile (React Native) - **Company:** Zapp - **Location:** London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Apple IOS, User Authentication, Code Review, Cursor (Graphical User Interface Elements), Node.Js, Mobile Security, TypeScript, Web Applications, ReactJS, Large Language Models, Software Security, Data Layers, Kotlin, Event Driven Architecture, Graphql, React Native - **Published:** June 22, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=0b1a9d5cff9a8b55 ## About the Role Do you have experience in iOS?, Do you have a Master's degree?, * A track record of building and shipping B2C consumer mobile apps at scale, and being the person who sets technical direction for a mobile team * Deep React Native expertise across iOS and Android, with the judgement to know its limits and drop into native when needed * Strong TypeScript * Real command of mobile performance, stability and release processes * Solid grasp of mobile security: secure storage, authentication patterns, and API security * You take genuine end-to-end ownership and operate autonomously * You communicate clearly, in writing and in person, and can bring people with you on a technical call rather than just winning the argument You have probably been doing this for 7 or more years, but we care about the impact you have had, not the number on your CV. Nice to have * Node.js (Express, Fastify) for the API layer * React.js or React Native for Web * Native experience (Kotlin, Swift) for the bridge and the trickier native modules * GraphQL, GCP, Firestore, Event-Driven architecture * Hands-on experience building with LLM or AI APIs ## Description As Principal Mobile Engineer you own the technical direction of our consumer iOS, Android and web apps, all built on React Native. This is a deliberately hands-on Principal role. You set the architecture and the standards, and you are still in the code every week shipping the hardest parts yourself. You will be the most senior mobile engineer in the company and the person the rest of the team levels up against. You will work closely with stakeholders in Commercial, Marketing and Operations to shape what we build and make sure the app serves the whole business. What you'll do * Own the architecture of the React Native app across iOS, Android and web, and make the calls on patterns, tooling and technical direction * Stay hands-on: ship the hardest features yourself and set the standard for what good looks like in the codebase * Raise the engineering bar across the mobile team through sharp code review, mentoring, and the example you set * Drive performance, stability and responsiveness, profiling and fixing the things that actually hurt on real devices and real networks * Own the release process and the health of what we put in front of customers * Partner with the wider business and the leadership team to turn ideas into fast, reliable, polished experiences * Work across the stack where it helps, into the backend APIs and data layers that feed the app * Use AI tooling (Claude, Cursor, Copilot) to ship faster and help the team get genuinely good at it, and build AI-powered features with LLM and on-device capabilities where they improve the product ## Related Videos - [There's an app for that - on the role of cross platform development in the app development ecosystem](https://www.wearedevelopers.com/videos/278-there-s-an-app-for-that-on-the-role-of-cross-platform-development-in-the-app-development-ecosystem) - [Kotlin Multiplatform - True power of native code reuse](https://www.wearedevelopers.com/videos/4-kotlin-multiplatform-true-power-of-native-code-reuse) - [Putting the Graph In GraphQL With The Neo4j GraphQL Library](https://www.wearedevelopers.com/videos/257-putting-the-graph-in-graphql-with-the-neo4j-graphql-library) - [Stop using Node.js like in 2020! What changed and what you can do today with Node.js](https://www.wearedevelopers.com/videos/100011-stop-using-node-js-like-in-2020-what-changed-and-what-you-can-do-today-with-node-js) - [Building Better Apps with React Native](https://www.wearedevelopers.com/videos/1466-building-better-apps-with-react-native) - [Why Kotlin is the better Java and how you can start using it](https://www.wearedevelopers.com/videos/661-why-kotlin-is-the-better-java-and-how-you-can-start-using-it) ## Related Articles - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025) - [Cross Platform Mobile Development Frameworks to Use in 2025](https://www.wearedevelopers.com/magazine/404-cross-platform-mobile-development-frameworks-to-use-in-2025) - [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023) - [A Guide to Choosing the Right Tools for App Developers](https://www.wearedevelopers.com/magazine/391-a-guide-to-choosing-the-right-tools-for-app-developers) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline)