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.

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.

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.

Backend Nest.js and TypeScript; frontend Angular (v20) and Ionic; Azure CI/CD for multiple daily deployments. You maintain the ZigZag Puppy Training mobile app (iOS and Android), shipping full-stack features and guiding backend architecture and API design.

Senior software engineers work with Nest.js, TypeScript, Angular, Ionic, and Azure CI/CD on the ZigZag dog-training mobile app (iOS/Android). This full-stack individual contributor role leads backend design, APIs, data modelling, and infrastructure decisions on a small, collaborative team.

You will work with Nest.js, TypeScript, Angular (v20), Ionic, and Azure CI/CD pipelines to build and maintain the Zigzag puppy training mobile app across iOS and Android, handling the full stack with a backend focus on APIs and data modelling.

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 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.

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.

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.

Use Kotlin Multiplatform (KMP), Flutter, or React Native; integrate TFLite/CoreML and real-time protocols (WebSockets, SSE). You'll build consumer-facing mobile apps and client SDKs for behavioral AI retail solutions, collaborating with ML engineers and product designers.

Build and enhance customer-facing and internal web applications using Next.js, React, TypeScript, and GraphQL. The Web Engineering team creates the web experiences powering customer acquisition, servicing, and internal tools at Zopa.

Expedia Group★3.8 (1.2k)· London

You will architect and deliver advanced Android solutions using Kotlin, Jetpack Compose, and MVVM/MVI patterns, and integrate AI/ML capabilities into mobile experiences. This role is on the Search and Recommendations Experience team, which owns the end-to-end search and discovery experience across lodging, cars, activities, flights, and packages on Expedia Group’s travel platform. You will provide technical leadership for native search and discovery and mentor mobile engineers across teams.

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.

Build production-grade cross-platform apps with React Native, TypeScript, and native modules (Swift/Kotlin). You'll design offline-first mobile workflows with AI integration (LLMs, agents) and build backend services (Python a plus). The team is removing manual barriers in industries like aerospace, healthcare, and energy.

Deliveroo★3.3 (1.5k)· London

Lead a full-stack team (~7–8 engineers) building the real-time, back-office workspace used by 30,000+ support agents across Deliveroo, DoorDash and Wolt. The stack includes Go, Python or Node.js (backend), React (frontend), with cloud tooling (Kubernetes, AWS, Datadog) and an in-house chat platform handling tens of millions of conversations monthly.

Proton★5.0 (1)· London

Join Proton's Inbox Desktop team to rebuild the Proton Mail Desktop App, Mail Bridge and Export tool using a cross-platform Rust stack. You'll work with Golang, C++, Qt, JS, TypeScript, React, Electron and standard dev tools (Git, GitLab CI, Jira). You’ll take technical ownership of the Windows and Linux desktop clients within a cross-functional team of about 60 engineers.

Proton★5.0 (1)· London

As a Senior Front End Engineer on the Standard Notes team, you will work with JavaScript, TypeScript, React, ES6, Playwright, Jest, and Grafana. The team builds a secure note-taking and productivity platform, developing features like encrypted search and cross-platform sync using end-to-end encryption. All Standard Notes codebases are open source.

Proton★5.0 (1)· London

You will work with PHP/Symfony for backend services, React for frontend, Kotlin (Android) and Swift (iOS) for mobile, with a growing shared Rust codebase, on Kubernetes infrastructure. The Payments team builds and scales payment methods and client libraries to enable subscriptions across Proton’s encrypted email, VPN, Drive, Pass, and Calendar products. The team works closely with the Account and Finance teams and across all business units.

Proton★5.0 (1)· London

Engineering Directors at Proton set technical direction and work with PHP (Symfony), Rust, Python, Swift, Kotlin, Jetpack, Typescript, React, C#, SQL, Redis, MySQL, and Ceph across mobile, desktop, web, and backend platforms. They lead engineering for one of Proton’s existing or upcoming products—such as Proton Mail, VPN, Calendar, Drive, or Pass—which provide private, secure, open-source tools to over 100 million users. The role involves managing a team of managers and driving DevSecOps practices.