Senior Systems Engineer, Workers Runtime
Build and optimize Cloudflare’s Workers Runtime, improving performance, reliability, scalability, and JavaScript/WebAssembly support at the edge. The role requires recent C++ or Rust experience, strong computer science fundamentals, and experience operating large-scale Linux-based distributed systems.
About the job
Responsibilities
- Build features and improvements for the Workers Runtime.
- Improve runtime performance, reliability, and scale.
- Expand JavaScript API and WebAssembly support.
- Help shape features based on what is technically possible.
- Own code in production and debug issues in a large-scale distributed system.
- Work in a fast-paced, iterative environment that balances product goals with technical execution.
Requirements
- 2+ years of recent professional experience with C++ or Rust.
- Strong computer science fundamentals, including data structures, algorithms, and software design.
- An operational mindset and experience owning production systems.
- Deep understanding of the web, including HTTP, JavaScript, and WebAssembly.
- Experience debugging and optimizing large-scale Linux-based distributed systems.
Nice-to-Haves
- Experience building high-performance distributed systems in Rust.
- Experience with cloud or serverless platforms.
- Familiarity with JavaScript engine internals such as V8, SpiderMonkey, or JavaScriptCore.
- Experience with standalone WebAssembly runtimes such as Wasmtime, Wasmer, or Lucet.
- Deep Linux, UNIX, kernel, or networking knowledge.
- Contributions to large open source projects.
Skills
C++, Rust, Data Structures, Algorithms, Software Design, Http, JavaScript, Webassembly, Linux, Distributed Systems, V8, Wasmtime, Networking, Serverless
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