Native Kotlin and Jetpack Compose development on a consumer-facing Android app for in-store grocery trips, running on a known device inside live stores. Integrates on-device edge AI (ML Kit, TensorFlow Lite) and uses AI coding tools like Cursor or Claude Code. Reports to the Head of Android.

You'll work with React, React Native, Node.js/TypeScript, SQL, and APIs. The company is building AI-powered infrastructure for the B2B secondhand clothing trade, grading, pricing, and categorizing items from photos. As a senior full stack engineer with a frontend lean, you'll own end-to-end user-facing features across web and mobile.

Koinly★3.0 (1)· London

Work with React 19, TypeScript, TanStack (Router, Query, Table), Radix UI, Mantine, Tailwind CSS v4, Vite, Vitest, Storybook, Highcharts, Sentry, Bun, and RabbitMQ on a data platform that reconciles crypto transactions and tax obligations for Koinly’s web application, with a React Native mobile app joining scope later.

Build Android fitness app features with React Native and Expo, using Claude for AI-assisted development and agentic workflows. 1-month contract fully remote.

Build and maintain the company’s platforms using JavaScript, Node.js, Next.js, Express.js, React/React Native, .Net 4.8/9/10, C#, HTML/CSS, and API Restful Services. You will develop both web and mobile applications, collaborating with the team while working independently.

Starling★3.5 (66)· London

Work with Swift (iOS) and Kotlin/Java (Android), native mobile security APIs and cryptography, and public cloud IaaS. You will design, build, and maintain security controls for the company’s Android and iOS mobile banking applications as part of the Cyber Security team.

Staff Frontend Engineer will work with React Native, TypeScript, GraphQL, iOS/Android platforms, CI/CD, and AWS. The role owns and evolves Feeld’s mobile architecture to improve performance, reliability, and delivery velocity for the company’s dating app. This is an individual contributor on the Platform team, influencing multiple product squads.

Google★4.3 (6.2k)· London

Work with Java and Kotlin on Android display and power management frameworks across devices. Manage engineers as a Tech Lead Manager, ensuring stability and extensibility of critical display and power frameworks for the Android ecosystem.

You will work with React Native, TypeScript, React Navigation, REST APIs, CI/CD, and automated testing. This is a greenfield role building a new cross-platform mobile application for enterprise customers at a fast-growing SaaS company.

Aristocrat★3.4 (216)· London

You will architect and evolve a React Native SDK and companion app, working with JavaScript, TypeScript, Git, and native iOS

You will build production mobile apps for iOS and Android using React Native, TypeScript, and integrate AI, natural-language features, Swift, Kotlin, and Python. The venture-backed startup creates AI-powered software that replaces manual workflows for industrial and operational teams.

You will own an existing production React/TypeScript application across web, iOS, and Android, integrating with Python/FastAPI backends and managing CI/CD pipelines. The team builds a computer-vision platform that turns video data into actionable insights. You will drive frontend architecture on a small, collaborative engineering team.

Work with Kotlin, Android frameworks, and platform APIs, migrating a mobile app from React Native to a native Android experience. You will join the Mobile Platform team to build technical foundations—architecture, shared libraries, build systems, and analytics infrastructure—for Zopa’s app, its primary customer touchpoint.

Work with React Native, TypeScript, AI-assisted engineering tools, analytics, feature flags, and monitoring tools. Build and ship mobile experiences for an AI-powered FinTech platform that transforms data infrastructure and workflow automation across global financial markets. Own mobile initiatives as a hands-on senior engineer.

Foundation Partners Group★2.6 (165)· London

Typescript, Python, full-stack web development, frontend focus, offline support, observability, and testing across devices. You will build and scale consumer-facing production web applications for Flok Health, an AI-native healthcare company transforming care for MSK pain.

You will work with Solidity, React, Node.js, TypeScript, GraphQL, React Native or Flutter, and Ethereum or Binance Smart Chain. This consulting company builds web, mobile, and Web3 applications with blockchain integration.

Senior Software Engineer role at Everfox, working with modern C++ on cross-platform desktop (Linux, Windows) and mobile (Android, iOS) apps, plus Java/Kotlin, Swift/Objective-C, Qt, GitLab, Docker, Kubernetes, and Python. You will build and maintain the end-point software layer for the Hardsec product line’s secure browsing and VDI solution, owning design, development, and delivery. You will also coordinate a small team of engineers and manage release planning across multi-platform shipped products.

Omaze★4.3 (6)· London

You will own mobile features across a TypeScript, React Native, and Expo codebase, writing native code in Swift (iOS) or Kotlin (Android) when needed and using EAS build and deployment workflows. Omaze gives its community the chance to win luxury homes while raising money for UK charities.

React, Node.js, AWS, TypeScript, React Native, RESTful and GraphQL APIs, serverless architectures, CI/CD, PostgreSQL, DynamoDB, and AI tools such as Claude and GitHub Copilot. Build and ship digital products for a pre-IPO challenger bank serving mass affluent clients, owning full-stack work from architecture to production monitoring.

Manage a mobile platform team working with React Native, Swift, and Kotlin to overhaul Zopa’s banking app. The team owns the app’s architecture, shared capabilities, libraries, and build/analytics infrastructure.

Design, develop and maintain scalable web and mobile applications using React or React Native for the front-end and Java for backend services and APIs at EC Markets.

Work with Kotlin, Jetpack Compose, Android Jetpack components, Kotlin Coroutines, Flow/StateFlow, RxJava, Hilt, and KMM. As an Android Engineer on the Customer Experience team, you will help further the success of the ASOS Android app, which has over 5M active users worldwide.

Smarkets★5.0 (2)· London

Build web and mobile apps with Next.js, React, React Native, TypeScript, Redux, React Query, WebSockets, and REST APIs, using Figma for design and GitLab with Kubernetes for DevOps. You will craft polished interfaces for Smarkets, which operates one of the world’s most sophisticated prediction markets for sports and political events.

Capital on Tap★3.9 (55)· London

You'll work with C#, .NET, .NET Core, Flutter, Dart, Riverpod, GoRouter, Kotlin, Swift, SQL Server, MongoDB, Firestore, GCP, Azure, and CodeMagic. You'll own backend services for the Banking and Repayments platform and contribute to iOS and Android mobile development.

Build full-stack mobile applications using React, Node.js, AWS, React Native, TypeScript, JavaScript, GraphQL APIs, serverless architectures, CI/CD, PostgreSQL, and DynamoDB. You'll design, develop, and ship digital products for Monument, a challenger bank serving the mass affluent, with ownership from architecture to production.