Senior Systems Engineer, Workers Runtime

Cloudflare•San Francisco, CA

2d•Onsite

About The Position

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.

Requirements

2+ years of recent professional experience with C++ or Rust.
Strong computer science fundamentals, including data structures, algorithms, and 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.

Nice To Haves

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.

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.