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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Full Stack Mobile Developer (iOS & Android) - **Company:** Synechron - **Location:** Sheffield, UK - **Experience:** Experienced - **Contract:** Permanent contract - **Skills:** .NET Framework, Application Programming Interfaces (APIs), Apple IOS, Application Performance Management, User Authentication, Automation of Tests, Microsoft Azure, Mobile Application Development, Code Review, Continuous Integration, Data Security, Software Design Patterns, Github, Mobile Application Software, JSON, OAuth, OpenID, Performance Tuning, Ui Patterns, Secure Coding, Google Cloud, Swiftui, Firebase, Backend, Kotlin, Google Cloud Functions, Graphql, Restful APIs - **Published:** July 29, 2026 - **Apply:** https://www.apply4u.co.uk/jobs/x/41944469/ ## About the Role Job Role: Full Stack Mobile Developer (iOS & Android) - .NET on GCPJob Location: Sheffield, UKExperience- 3+ Years of experience building mobile apps for both iOS and Android, using native and/or cross-platform approaches.Work Type: Hybrid, Skills required (experience and capabilities):3+ years' experience building mobile apps for both iOS and Android, using native and/or cross-platform approaches.Native: Swift/SwiftUI (iOS), Kotlin/Jetpack (Android)Cross-platform (nice to have): AngularStrong understanding of mobile app architecture, design patterns, performance optimization, and debugging.Solid experience integrating mobile apps with backend services via RESTful APIs, JSON, and secure authentication flows (e.g., OAuth2/OIDC concepts).Working knowledge of .NET backend development and API fundamentals (able to collaborate effectively and contribute where needed).Familiarity with GCP-hosted services and mobile-relevant cloud components (e.g., Firebase, Cloud Functions, Pub/Sub or equivalents).Experience with CI/CD and release tooling (e.g., GitHub Actions, Fastlane, Bitrise, Azure DevOps or similar).Understanding of security best practices for mobile (secure storage, certificate pinning awareness, threat modelling mindset).Strong communication skills and a collaborative approach across engineering, product, and d esign. ## Description Role purpose:Design, build, and maintain high-quality mobile applications across iOS and Android, working end-to-end from mobile UI through to integration with backend services running on .NET and hosted on Google Cloud Platform (GCP). You'll collaborate closely with product, design, backend, and cloud teams to deliver secure, performant, and scalable mobile experien ces. Key responsibilities:Design and develop high-performance, scalable mobile applications for iOS and Android.Build and maintain reusable mobile components, UI patterns, and app architecture aligned to engineering standards.Integrate mobile apps with backend services on GCP using REST/JSON (and where relevant GraphQL), including authentication and secure data handling.Contribute to backend/API integration work (and occasionally service improvements) in a .NET ecosystem to support mobile features.Ensure reliability, responsiveness, and strong user experience across a range of devices, OS versions, and network conditions (including offline considerations where needed).Implement automated testing, participate in code reviews, and support CI/CD pipelines and release processes.Monitor and optimize app performance, stability, battery usage, and telemetry; troubleshoot production issues.Ensure compliance with enterprise security, data privacy, and secure coding practices.Contribute to agile ceremonies (planning, refinement, stand-ups) and deliver iteratively with the ## Related Videos - [Tips and Tricks for Working with JSON](https://www.wearedevelopers.com/videos/1229-tips-and-tricks-for-working-with-json) - [Keeping applications secure by evolving OAuth 2.0 and OpenID Connect](https://www.wearedevelopers.com/videos/100152-keeping-applications-secure-by-evolving-oauth-2-0-and-openid-connect) - [Kotlin Multiplatform - True power of native code reuse](https://www.wearedevelopers.com/videos/4-kotlin-multiplatform-true-power-of-native-code-reuse) - [Optimization of Mobile Development Strategies for Maximum Business Impact](https://www.wearedevelopers.com/videos/1182-optimization-of-mobile-development-strategies-for-maximum-business-impact) - [Introducing JSON Structure](https://www.wearedevelopers.com/videos/100219-introducing-json-structure) - [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) ## Related Articles - [Cross Platform Mobile Development Frameworks to Use in 2025](https://www.wearedevelopers.com/magazine/404-cross-platform-mobile-development-frameworks-to-use-in-2025) - [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 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs)