You'll work primarily with TypeScript, Node.js, and PostgreSQL on GCP, designing and building scalable backend systems. The team develops and maintains a robust investment platform that powers features like mutual funds, bonds, and family investment tools.

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.

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 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.

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.

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.

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.

Ebury★3.3 (13)· London

You will work with React Native, React, TypeScript, Python, PostgreSQL, Redis, Expo pipelines, AWS, and Git. You join Ebury’s Mobile Platform team to evolve the mobile app by building features, services, and frameworks that empower product teams to ship efficiently while maintaining a unified customer experience.

You'll develop Android applications using Kotlin and Jetpack Compose for a leading UK consumer fintech company serving millions of customers. The role involves building market-leading mobile apps, contributing to architectural decisions, mentoring developers, and championing engineering best practices like TDD and continuous delivery. You'll work within a high-performing mobile engineering team in a collaborative, cross-functional environment focused on exceptional user experiences.

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 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.

You'll work with NodeJS, TypeScript, Google Cloud Platform, and PostgreSQL to build backend systems for Freetrade, a UK investment platform democratizing access to investing through features like mutual funds, bonds, and family investment tools. You'll develop scalable solutions, collaborate with product teams, maintain code quality, and handle on-call responsibilities for a platform used by thousands of daily investors.

Freetrade, a UK investment platform simplifying wealth management, seeks a backend engineer to build features like mutual funds, bonds, and family investment tools. You'll work with Node.js, TypeScript, Google Cloud Platform, and PostgreSQL on a scalable platform serving thousands of daily users. The role involves developing high-quality software, solving complex technical challenges, and collaborating with product teams on core investment features.

Freetrade, a UK investment platform simplifying investing for millions, seeks a mid-level backend engineer to develop scalable solutions using Node.js, TypeScript, and Google Cloud Platform with PostgreSQL. You'll build features like mutual funds, bonds, and family investment tools while working on a platform serving thousands daily, collaborating closely with product teams and maintaining high code quality standards.

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.