Senior Software Engineer, Workers Runtime
Core
Building and optimizing the runtime that executes customer code at the edge, focusing on performance, reliability, and scale for JavaScript and WebAssembly.
Role type
Senior IC systems engineer (runtime)
Builds
The Cloudflare Workers Runtime
Domain
Cloud infrastructure / Edge computing / Distributed systems
Deliverable
production ML models | product features | infrastructure
Required skills
C++ or Rust, computer science fundamentals (data structures, algorithms, software design), operational mindset, deep web knowledge (HTTP, JavaScript, WebAssembly), debugging large-scale Linux distributed systems
Preferred skills
Rust high-performance distributed systems, cloud/serverless platforms, JS engine internals (V8, SpiderMonkey, JavaScriptCore), standalone WebAssembly runtimes (Wasmtime, Wasmer, Lucet), Linux/UNIX/kernel/networking knowledge, open source contributions
Technologies
C++, Rust, JavaScript, WebAssembly, HTTP, Linux, V8, SpiderMonkey, JavaScriptCore, Wasmtime, Wasmer, Lucet
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 technical feasibility, 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
Seniority
Senior, hands-on IC
