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 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.

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.

Rightmove★3.7 (31)· London

Java, Spring Boot, Elasticsearch, Kafka, Gradle, Hibernate, Couchbase, SQL, and Docker. You will build and improve microservices that power Rightmove’s iOS and Android apps, working in a cross-functional team.

You will work with Kotlin, Spring, React Native, TypeScript, PostgreSQL, AWS, Terraform, and Ansible to build backend features for a cross-border fintech mobile app that serves emerging markets. The role focuses on developing consumer-facing features end-to-end in a fast-growing engineering team.

Rightmove★3.7 (31)· London

NodeJS and Java (Spring Boot) on Google Cloud Platform. This role leads cross-functional product development teams building the technology customers use to list properties on Rightmove.

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.

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.

Rightmove★3.7 (31)· London

You'll work with Java 17+, Spring Boot, Kafka, Elasticsearch, Hibernate, Couchbase, SQL, Gradle, and Docker, building backend services and microservices for Rightmove's property platform. The role involves designing features, owning technical decisions end-to-end, and mentoring junior engineers within a cross-functional team supporting millions of users and thousands of agents.

Rightmove★3.7 (31)· London

You'll work primarily in Java and Spring Boot, operating across frontend, mobile, data, and infrastructure to lead architectural design and standards across Rightmove's consumer product domain—property search, listings, saved searches, maps, and valuations serving millions of users. This principal role involves mentoring senior engineers and tech leads, guiding large cross-team initiatives, and shaping long-term platform direction across approximately 60 engineers in the consumer domain.

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 build cloud-native microservice applications using Java and Kotlin, delivering end-to-end solutions with RESTful APIs and relational databases while leveraging AI coding tools. The Back-End Engineering team supports JPMorgan Personal Investing's digital wealth management platform serving over 275,000 UK investors, working across fraud prevention, investments, identity services, payments, and core banking. You'll own products through their full lifecycle including production support and incident management.

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.

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.