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.

Starling★3.5 (66)· London

Work with Swift (iOS) and Kotlin/Java (Android), native mobile security APIs and cryptography, and public cloud IaaS. You will design, build, and maintain security controls for the company’s Android and iOS mobile banking applications as part of the Cyber Security team.

Google★4.3 (6.2k)· London

Work with Java and Kotlin on Android display and power management frameworks across devices. Manage engineers as a Tech Lead Manager, ensuring stability and extensibility of critical display and power frameworks for the Android ecosystem.

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.

Senior Software Engineer role at Everfox, working with modern C++ on cross-platform desktop (Linux, Windows) and mobile (Android, iOS) apps, plus Java/Kotlin, Swift/Objective-C, Qt, GitLab, Docker, Kubernetes, and Python. You will build and maintain the end-point software layer for the Hardsec product line’s secure browsing and VDI solution, owning design, development, and delivery. You will also coordinate a small team of engineers and manage release planning across multi-platform shipped products.

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.

Design, develop and maintain scalable web and mobile applications using React or React Native for the front-end and Java for backend services and APIs at EC Markets.

Work with Kotlin, Jetpack Compose, Android Jetpack components, Kotlin Coroutines, Flow/StateFlow, RxJava, Hilt, and KMM. As an Android Engineer on the Customer Experience team, you will help further the success of the ASOS Android app, which has over 5M active users worldwide.

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.

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

Work with Kotlin (90%+) and Java, using Android Studio, Jetpack Compose, Coroutines/Flow, MVVM, Webviews, and modular architectures. You'll build and test major new features for the Guardian's award-winning Android app, while improving and maintaining existing functionality. You'll take a leadership role on projects and mentor other developers.

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.

JD.COM★3.8 (53)· London

Develop and maintain the Joybuy Android eCommerce app using Kotlin, Java, Android frameworks, and third-party libraries. You will collaborate with product management and engineering teams to deliver user-centric solutions for European markets.

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.

Starling Bank seeks Android engineers to develop their in-house digital banking app using Kotlin, MVVM, RxJava, Dagger, and Realm, with testing via Espresso and JUnit. The role involves building features, improving CI automations and tooling, and shipping code alongside cross-functional teams at a fully licensed UK digital bank. Engineers work in hybrid arrangements with at least one office day per week, reporting to a mobile lead.

You'll build production Android apps in Kotlin, integrating AI-powered features like LLM chat, vision, and voice through backend APIs while optimizing performance and reliability for mobile devices. BJAK is developing a proactive AI smart assistant for everyday users focused on multi-step workflows, persistent context, and real-world task completion. The role requires 3+ years Android experience with hands-on AI feature integration and strong async programming skills.

Depop★4.4 (61)· London

Staff Backend Engineer at Depop will work with Scala, Java, or TypeScript on AWS, GCP, or Azure, with event-driven architectures using Kafka. You'll lead technical design and architecture for the Payments and Fulfilment systems serving Depop's 35M-user circular fashion marketplace, partnering with product squads and engineering leaders while mentoring engineers and setting technical standards across these critical systems.

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.