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.

Tripadvisor★3.9 (142)· London

Android Engineer role working with Kotlin, Coroutines, Jetpack Compose, Cursor, and GraphQL in a modular, clean-architecture MVVM layout. You will build and release code for the Tripadvisor Experiences mobile app, collaborating with product and designers on the full software lifecycle. This is a full-stack role where you primarily develop Android systems, with occasional back-end projects.

Tripadvisor★3.9 (142)· London

You will work with Kotlin, Coroutines, Jetpack Compose, Cursor, GraphQL, and MVVM in a clean-architecture modular layout. You’ll join the Tripadvisor Experiences mobile team, focusing on Android app development with occasional backend microservices work.

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.

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.

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.

Tripadvisor★3.9 (142)· London

You'll work across mobile (iOS/Android with Swift/Kotlin), web frontend, backend services, and data layers, using REST/GraphQL. The Tripadvisor Experiences Engineering team builds the platform, mobile apps, and infrastructure that help operators and third parties manage inventory and bookings.

Tripadvisor★3.9 (142)· London

Work across mobile (iOS/Swift, Android/Kotlin, offline sync, push, auth, REST/GraphQL), web frontend, backend services, and data/infra layers. You will architect long-lasting systems, lead technical design reviews, and drive operational maturity for the Tripadvisor Experiences platform, which helps operators build their businesses and enables third parties to utilize inventory.

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.

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.

Depop★4.4 (61)· London

This Senior Backend Engineer role uses Scala (primary), TypeScript, Python, Play Framework, Kubernetes, PostgreSQL, DynamoDB, and Kafka. The Shipping Experience team builds and evolves the end-to-end shipping journey for buyers and sellers on Depop’s peer-to-peer circular fashion marketplace.

Works with SAST, DAST, SCA, Burp Suite, OWASP ZAP, Semgrep, Python, Java, Kotlin, Go, JavaScript, and CI/CD pipelines (GitHub Actions

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.

Funding Circle★3.5 (53)· London

You will work with React Native, React.js, TypeScript, Firebase, Gradle, XCode, REST APIs, and CI/CD for app releases on iOS and Android. The role involves building and scaling a mobile app for Funding Circle’s fintech platform that uses data to provide fast funding to small businesses.

You'll build fullstack features using React, React Native, TypeScript, Go, Node.js, GraphQL Federation, gRPC, and Kubernetes on Juniper, a GLP-1 weight-management program combining medication with personalized nutrition and clinician-led care. The Shop/Ecosystem squad expands Juniper into new product lines and develops recommendation tools in collaboration with Data Science, working across web and mobile platforms. This is a high-autonomy senior role owning features from design through delivery.

You'll work with React, TypeScript, React Native, GraphQL Federation, Go, gRPC, Pub/Sub, Kubernetes, and GCP on Juniper, a large-scale weight-management program combining GLP-1 medication with personalized nutrition and clinician-led care. As a senior frontend engineer in the Growth squad, you'll own the frontend web platform, design and deliver growth-focused experiments improving retention and conversions, and mentor teammates while influencing best practices across the team.

You'll build fullstack features using React, React Native, Go, Node.js, TypeScript, GraphQL Federation, gRPC, and Kubernetes on Juniper, a large weight-management program combining GLP-1 medication with personalized nutrition and clinician-led care. The Shop/Ecosystem squad expands Juniper into new product lines and services, including a recommendations tool developed with Data Science for web and mobile platforms. You'll collaborate cross-functionally to implement scalable solutions and mentor other engineers in a high-autonomy senior role.

JPMorgan★3.9 (20k)· London

You'll work with React, JavaScript, TypeScript, React Native, REST APIs, and GraphQL to build front-end solutions for Chase UK, JPMorgan's digital banking platform launching across the UK. The role involves designing and delivering cloud-native microservices applications while mentoring junior developers and collaborating with cross-functional teams in a flat-structure, tribe-and-squad organization.

JPMorgan★3.9 (20k)· London

You'll build and maintain web applications for Nutmeg (JPM Personal Investing's UK wealth management platform) using React, HTML5, CSS, JavaScript ES6, Jest/RTL, Webpack/Vite, Docker, Git, Jenkins, and GitHub Actions within a cross-functional team. The role involves delivering product features end-to-end, fixing defects, conducting code reviews, and ensuring accessibility, security, and performance standards across the web ecosystem powered by an internal React design system.

JPMorgan★3.9 (20k)· London

You'll work with Java, Spring Boot, Kotlin, DynamoDB, Aurora/MySQL, AWS, Kubernetes, and Kafka on event-driven microservices for J.P. Morgan Personal Investing's mobile and web investment platform serving over 275,000 UK investors. The role involves designing and evolving architecture, owning features end-to-end, writing tests, and driving AI-assisted engineering practices across the team.

JPMorgan★3.9 (20k)· London

You'll work with React Native, TypeScript, JavaScript, Kotlin, Swift, REST APIs, and GraphQL to build cloud-native microservices for Chase UK's mobile banking platform. As a Senior Lead, you'll design end-to-end solutions, mentor junior developers, and drive architectural decisions across the full SDLC while collaborating with cross-functional teams in a flat-structure organization.

JPMorgan★3.9 (20k)· London

You'll work with JavaScript, TypeScript, ES6+, and preferably React and React Native to build mobile banking applications for Chase UK's digital bank. The role involves designing cloud-native microservices architecture and delivering end-to-end solutions within a flat-structure organization serving millions of customers. You'll mentor junior developers, conduct testing, and drive continuous improvement across the full software development lifecycle.

JPMorgan★3.9 (20k)· London

You'll work with React Native, TypeScript, and JavaScript to build mobile banking applications for Chase UK, JPMorgan's digital bank serving millions of customers across the US and UK. The role involves designing cloud-native microservices architecture, mentoring junior developers, and delivering end-to-end solutions in a flat-structure organization focused on startup-style agility and customer impact.