Senior Software Engineer, Durable Objects (DO)
Build and evolve Cloudflare's Durable Objects runtime, low-level routing, and storage systems for stateful serverless applications at global scale. Requires 5+ years systems software experience with deep expertise in Rust or C++ and large-scale distributed systems.
About the job
Responsibilities
- Build and improve the Durable Objects runtime.
- Design and develop the low-level routing and storage systems that power customer applications.
- Improve reliability, scalability, performance, and feature depth.
- Own code end-to-end from design through production.
- Solve complex problems in production distributed systems.
- Work across JavaScript, TypeScript, Rust, and C++.
- Help drive the continued evolution of the system.
Requirements
- 5+ years of experience writing systems software.
- Operational mindset with experience owning code in production.
- Strong foundation in data structures, algorithms, and system design.
- Deep expertise in at least one systems programming language such as C/C++ or Rust.
- Experience designing and architecting large-scale distributed systems.
- Familiarity with cloud platforms, especially serverless architectures.
- Experience as a technical leader or team lead, driving engineering decisions.
Nice-to-Haves
- Experience working on database internals, especially SQLite.
- Deep understanding of web technologies such as browsers, HTTP, JavaScript, and WebAssembly.
- Background in low-latency, real-time environments such as game streaming, high-frequency trading, or payment systems.
- Experience debugging, optimizing, and identifying failure modes in large-scale Linux-based distributed systems.
Skills
Rust, C++, JavaScript, TypeScript, Distributed Systems, Systems Programming, Sqlite, Webassembly, Linux, Http
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