Senior Systems Engineer, Workers Runtime

Cloudflare's Emerging Technologies & Incubation team is seeking a Senior Systems Engineer for the Workers Runtime team — which ships the runtime that executes customer code at the edge. The engineer will improve performance, expand JavaScript and WebAssembly support, and help the runtime scale safely and efficiently. Onsite in Austin, TX. Posted 2026-08-12.

• 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. • Bonus: experience building high-performance distributed systems in Rust; familiarity with JS engine internals (V8, SpiderMonkey, JavaScriptCore); experience with standalone WebAssembly runtimes (Wasmtime, Wasmer, Lucet); deep Linux/UNIX/kernel/networking knowledge; contributions to large open source projects.