Senior Software Engineer, Workers Runtime
Cloudflare · In-Office
About this role
**Senior Software Engineer, Workers Runtime** **Location:** Austin, TX ## About Cloudflare Cloudflare’s mission is to help build a better Internet. We protect and accelerate internet applications through our intelligent global network—improving performance while reducing spam and other attacks. ## About the Role You’ll join the **Emerging Technologies & Incubation** team, working on the **Workers Runtime**—the runtime that executes customer code at the edge. In this role, you’ll improve performance, expand **JavaScript** and **WebAssembly** support, and help the runtime scale safely and efficiently. ## 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 balancing product goals with technical execution ## Desirable Skills, Knowledge & Experience - 2+ years of recent professional experience with **C++** or **Rust** - Strong computer science fundamentals (data structures, algorithms, software design) - Operational mindset with experience owning production systems - Deep understanding of the web (HTTP, JavaScript, WebAssembly) - Experience debugging and optimizing large-scale **Linux-based distributed systems** ## Bonus Points - Experience building high-performance distributed systems in Rust - Experience with cloud or serverless platforms - Familiarity with JS engine internals (V8, SpiderMonkey, or JavaScriptCore) - Experience with standalone WebAssembly runtimes (Wasmtime, Wasmer, or Lucet) - Deep Linux/UNIX/kernel/networking knowledge - Contributions to large open source projects ## Notes - In-person interviews may be required at an office or hub during later stages. - This role may involve access to information protected under U.S. export control laws. - Cloudflare is an equal opportunity employer and provides reasonable accommodations for qualified individuals with disabilities.
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