Proton★5.0 (1)· London

You will work with Kotlin, Jetpack Compose, and an increasingly shared Rust core to build Android applications. You will join a product team working on Proton Drive, Payments, or Account, building privacy-first tools for millions of users.

Proton★5.0 (1)· London

You will work daily with C#, TypeScript, and Rust, also providing bindings for Swift and Kotlin, using tools like Grafana, Prometheus, Sentry, GitLab CI, and Playwright. The Drive Foundation team builds the SDK that powers Proton Drive, ensuring cross‑client consistency and serving as the backbone for the encrypted cloud storage service.

Proton★5.0 (1)· London

Build the Proton Drive Linux client from scratch using GTK+ or Qt, with Rust as a nice-to-have, and manage Git, CI/CD pipelines, and Linux packaging for Debian and Fedora. The Proton Drive team provides secure cloud storage and collaborative editing, and this greenfield project will create the first native Linux client.

Proton★5.0 (1)· London

Join Proton's Inbox Desktop team to rebuild the Proton Mail Desktop App, Mail Bridge and Export tool using a cross-platform Rust stack. You'll work with Golang, C++, Qt, JS, TypeScript, React, Electron and standard dev tools (Git, GitLab CI, Jira). You’ll take technical ownership of the Windows and Linux desktop clients within a cross-functional team of about 60 engineers.

Proton★5.0 (1)· London

You will work on iOS apps using Swift, Xcode, and Apple platforms, with a growing Rust-based logical core. You'll join a product team building privacy-first tools for Proton’s encrypted email, VPN, cloud storage, and password management services used by millions.

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.

You'll build the iOS app for xAI's AI system designed to understand the universe and aid humanity in knowledge pursuit. Work with Swift, SwiftUI, UIKit, Combine, and optionally Rust, focusing on performance optimization, real-time AI model integration via REST/gRPC, and pixel-perfect UI design. You'll own features end-to-end in a small, flat-structured team prioritizing engineering excellence and speed.

You'll build Android mobile experiences for xAI's AI applications using Kotlin, Jetpack Compose, and reactive programming. You'll work on a small team creating cutting-edge AI products that deliver user impact, with opportunities to use Rust for backend integration. Strong product sense, ownership, and architectural expertise in large production apps are essential.

Spotify★4.1 (116)· London

You'll design and build C++ integration layers for Spotify's TV playback, working with native media frameworks like AVPlayer and ExoPlayer on a Rust runtime. The Native Playback team owns critical systems including buffering, A/V synchronization, adaptive bitrate configuration, and rendering across TV devices, directly impacting millions of users' listening experience. You'll debug complex performance issues across application and OS layers, partner with platform teams, and improve test coverage and observability.

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 architect and operate high-scale systems for Deliveroo's three-sided marketplace using Go, Ruby, Python, Scala, or Rust, working with PostgreSQL, Redis, DynamoDB, and Elasticsearch to handle 20k+ requests per minute. As a Staff Engineer, you'll provide technical leadership across multiple teams, define strategic direction for complex logistical challenges, and mentor engineers while influencing the organization's technical roadmap.