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.

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.

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.

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.

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.

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.

JPMorgan★3.9 (20k)· London

You'll work with Salesforce (Service Cloud, Sales Cloud, Marketing Cloud), Apex, Lightning Web Components, SOQL/SOSL, REST integrations, and enterprise AI coding tools. The team builds platforms and standalone products for JPMorgan Personal Investing's customer service, marketing, and operations functions, integrating with internal services to enhance the customer experience for 275,000+ UK investors.

You'll work with TypeScript, Node.js, JavaScript, and AWS microservices to build features for Motorway's vehicle auction platform, connecting dealers and sellers in the UK used car marketplace. The Dealer Core team focuses on delivering tools that help dealers find inventory while creating competitive market conditions for sellers. You'll collaborate with product and design teams on new features, maintain platform services, and contribute to technical strategy discussions.

Deliveroo★3.3 (1.5k)· London

You'll work with Go, Ruby/Rails, Python, Scala, or Rust alongside PostgreSQL, Redis, DynamicDB, and ElasticSearch to build Deliveroo's food delivery marketplace serving millions at scale. You'll improve code architecture, lead technical projects, conduct interviews, mentor engineers, and collaborate across teams while solving logistical problems in a three-sided marketplace.

Deliveroo★3.3 (1.5k)· London

You'll work with Go, Ruby, Python, Scala, and Rust to build production systems for Deliveroo's three-sided on-demand delivery marketplace, handling real-time logistics, infrastructure, and marketplace optimization that serves millions of users globally. As a new grad engineer in London, you'll own features end-to-end, improve system architecture, and collaborate across teams while receiving mentorship from senior engineers.

Deliveroo★3.3 (1.5k)· London

You'll design and scale backend services for Deliveroo's real-time food delivery marketplace using Go, Ruby, or Python, working with relational databases like PostgreSQL and NoSQL systems such as Redis and DynamoDB. The role involves improving code architecture, enhancing system reliability through monitoring, and collaborating across teams to support a hyper-local marketplace serving millions of users globally.

Deliveroo★3.3 (1.5k)· London

You'll work with Go, Ruby/Rails, Python, Scala, and Rust to build backend web applications, with experience in PostgreSQL, MySQL, Redis, DynamoDB, and ElasticSearch for data handling. You'll improve code architecture and lead project planning for Deliveroo's three-sided marketplace serving millions of customers, riders, and partners globally, while mentoring engineers and guiding technical decisions across your team.

Deliveroo★3.3 (1.5k)· London

You'll design and build scalable backend services and frontend components using Go, Ruby, Python, and Scala, handling high-traffic workloads (20k+ rpm) with PostgreSQL, MySQL, Redis, DynamoDB, and Elasticsearch. You'll join Deliveroo's engineering team powering a three-sided food delivery marketplace serving millions of customers, riders, and partners globally, leading architectural improvements and mentoring colleagues.