Lovable★4.0 (43)· London

Uses Go, Rust, TypeScript; AWS, Azure, Google Cloud, Cloudflare; Kubernetes, Terraform, Temporal, OTEL, CI/CD; PostgreSQL, ClickHouse, Firestore, Spanner, BigQuery. Builds the platform for Lovable Enterprise enabling secure, cloud-agnostic deployment, defining architecture for sandboxing, networking, encryption, identity, and mentoring engineers.

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.

Koinly★3.0 (1)· London

You will work with TypeScript on Bun, RabbitMQ, Redis, PostgreSQL, Vitest, Sentry, and Rust. The team owns the distributed data-processing backend that ingests, normalizes, and reconciles on-chain and exchange data for Koinly’s crypto tax calculation product.

Lovable★4.0 (43)· London

Build enterprise deployments using Go, Rust, and TypeScript on AWS, Azure, and Google Cloud, with Kubernetes, Terraform, and Temporal. You will build the platform that allows large customers to run Lovable securely and at scale across every major cloud provider.

You’ll design and build high-performance software using Rust, C/C++, React, REST APIs, SQL, Redis, and NGINX. The team is rebuilding legacy institutional investment management systems into a cloud-native platform covering portfolio management, trading, risk analytics, and AI. This is an early-stage, small collaborative team.

You will write performance-critical software in Rust, working across backend services, APIs, and infrastructure—with frontend in React/Next.js/TypeScript when needed—for a global financial services firm. The stack includes Tokio, Azure, Kubernetes, Python, SQL, and CI/CD tooling. This is an early-career engineering role with end-to-end ownership.

You will work in a Rust stack with Python at API boundaries, using Kafka, PostgreSQL/TimescaleDB/PostGIS, gRPC/protobuf, and Kubernetes. The team builds real-time intelligence infrastructure that ingests high-volume data streams, processes them in real time, and surfaces actionable insights. This is a small, high-impact engineering team inside a scaling company.

Build and launch AI-powered products using TypeScript, React, Node.js, Rust, Azure, Docker, and LLM APIs (OpenAI, Anthropic). As the founding product engineer, you’ll own the full stack—from frontend and backend to AI workflows—and work directly with founders to shape product direction from 0 to 1.

TypeScript, Python, Rust, or C++ for a full-stack desktop application, backend for live data ingestion, and the algorithmic layer bridging research and product. This role is at a stealth-mode AI startup building a proactive AI assistant that maintains a persistent model of user work history. As a Founding Senior Engineer, you will work directly with AI researchers in a small team.

Durlston Partners· London

You'll work with C++, Java, Rust, Python, TypeScript/JavaScript, Angular, or React. The deep tech company builds software for humanitarian, surveillance, and defence applications. Lead engineers own technical decisions for a core enterprise product and mentor small teams of 2–3.

Wand is hiring a Senior C++ Reverse Engineer to work with C++, the Windows platform, Unreal and Unity game engines, and disassembly. You will own the game engine SDKs, hooking, and cross-DLL machinery that let the company read game state in real time to power mods, maps, and tools for players across thousands of PC games. This is a senior individual contributor role on the native team.

You will lead a team using TypeScript, Node.js, and React on AWS serverless, microservices, and event-driven architectures. The Affinidi Elements team builds a decentralized digital identity platform that gives users control over their data. You will guide the engineering team in delivering high-quality, secure features.

Senior Software Engineer working with **Rust, Golang, or TypeScript** to design, build, and operate scalable systems. You will create and evolve services for the **USA market’s customer digital experience**, including payments, orders, loyalty, and web/mobile applications.

TypeScript, Python, Rust, React, C++, Docker, and Kubernetes. You will build scalable software across Emotech’s AI products and customer platforms, productionising AI prototypes and models from the company’s speech and multimodal research teams.

Work with Java, Go, Rust, or Python to design, build, and maintain backend services, APIs, and distributed systems for a regulated blockchain-based wholesale payment and settlement platform. Use AI-assisted development tools and build MCP servers, AI agents, and skills.

Durlston Partners· London

Backend roles use C++, Java, Rust, or Python; Frontend roles use React and WebGL. Full Stack engineers work across both. The company builds the foundational software and AI for the autonomous age, the operating layer that lets organisations task, control, and act on data from fleets of autonomous assets.

TypeScript, React, Rust, Effect, HTML, Material UI, Base UI, Ariakit, and Panda. They build an open-source platform unifying structured and unstructured data to improve simulation, optimisation, and automation of real-world systems.

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.

Build features on a regulatory reporting platform using Python, FastAPI, SQLAlchemy, PostgreSQL, and Docker. You will work with RESTful APIs, Git, and optionally Clickhouse, Go, or Rust on complex data pipelines for a regtech SaaS company serving Tier 1 banks.

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.

JPMorgan★3.9 (20k)· London

Work with Python, Java, Go, or Rust, enterprise AI-assisted development tools, and CI/CD tools. You will build and deliver market-leading technology products for JPMorganChase’s Public Cloud Engineering – Infrastructure Platforms team.

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.

You'll build with Python, Node, LLM APIs, and AI coding tools (Cursor, Claude), and contribute to internal frameworks for evaluation, RAG, and orchestration. Cogna's AI-powered Software Factory generates bespoke software to solve operational challenges for critical industries like energy, logistics, and manufacturing.