Senior Systems Engineer, Workers Runtime
Cloudflare · In-Office
About this role
**Senior Systems Engineer, Workers Runtime** **Location:** Austin, TX ## About the Role Cloudflare’s Emerging Technologies & Incubation team builds new products at the edge by combining Cloudflare’s network scale with rapid product incubation. This role is on the **Workers Runtime** team, which ships the runtime that executes customer code at the edge. 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 that balances 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 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**. ## Bonus Points - Experience building high-performance distributed systems in Rust. - Experience with cloud or serverless platforms. - Familiarity with JS 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. ## What Makes Cloudflare Special? Cloudflare is focused on protecting the free and open Internet and building technology that helps organizations defend against attacks and improve reliability and access to critical services. *Note:* Applicants who progress to the offer stage may be asked to attend an in-person interview at a Cloudflare office or hub. This role may require 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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