Steel | Applied AI Engineer + Infrastructure Engineer | Toronto, ON | ONSITE | $160k-$240k USD base + equity Steel is open-source browser infrastructure for AI agents and apps. We make it easy for developers to ship products that interact with the web - without spending 80% of their time on browser pools, proxies, CAPTCHAs, and session state. In 2025 we grew 50x: 6,000+ GitHub stars, dozens of paying customers, millions of sessions served monthly. Dedicated chromium runs on Firecracker VMs for sub-second cold starts. Stack: TypeScript, React/Next.js, Node.js, AWS, Firecracker, Postgres, Redis. 4+ YOE for both roles. --- Applied AI Engineer --- Shape how AI agents interact with the web. Build open-source frameworks/demos on the Sessions API, run experiments on which models/prompts/harnesses actually work, build evals against real scenarios, and work with customers shipping agents to production. AI-native full-stack engineers with strong product sense. --- Infrastructure Engineer --- Design and operate the systems Steel runs on. Sample projects: VM snapshotting that restores full browser state in under a second, performance-tuning the Sessions API from kernel traces, orchestrating millions of sessions with sub-second cold starts. Distributed-systems experience, strong AWS/GCP and Linux/OS fundamentals. Rust is a plus. Public referral bonus: $10,000 if your intro becomes a hire. Apply: email [email protected] with GitHub & resume, mention HN.

Applied AI Engineer + Infrastructure Engineer

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