Steel.dev

Steel is open-source browser infrastructure for AI agents and apps. It helps developers ship products that interact with the web without spending most of their time on browser pools, proxies, CAPTCHAs, and session state. In 2025 it grew 50x with thousands of GitHub stars and millions of sessions served monthly, using dedicated chromium runs on Firecracker VMs for sub-second cold starts. Applied AI Engineer: shape how AI agents interact with the web; build open-source frameworks/demos on the Sessions API; run experiments on models/prompts/harnesses; build evals against real scenarios; work with customers shipping agents to production. Infrastructure Engineer: design and operate the systems Steel runs on; sample projects include VM snapshotting for fast full browser state restore, performance-tuning the Sessions API from kernel traces, and orchestrating millions of sessions with sub-second cold starts. Requires distributed-systems experience and strong AWS/GCP and Linux/OS fundamentals; Rust is a plus.