Windmill is an open-source developer platform (16k+ GitHub stars, Paris-based) that turns scripts into workflows, internal tools, and full-stack apps. It's the sweet spot between Retool and Temporal - we compete with both, plus Airflow and n8n, and we're winning on DX and performance.

How it works: write scripts in Python, TypeScript, Go, Bash, Rust, SQL, etc. Windmill analyzes their parameters and auto-generates UIs, turning each script into a standalone app or a reusable no-code module. Chain scripts into flows (branching, parallelism, retries, error handling) to build powerful workflows. Trigger anything via cron, webhook, auto-generated UI, or custom dashboards built with our app builder. Under the hood: an all-in-one queue/worker runtime, script editor, flow builder, secret manager, OAuth platform, with enterprise-grade permissions, groups, and audit logs.

The insight: no-code tools are intuitive but not extensible. Writing code is only 10% of the work - then you deal with credentials, CI/CD, permissions, UIs, error handling. Windmill handles all of that so developers focus on the logic that matters.

Stack: Rust / TypeScript + Svelte / PostgreSQL. Easy to deploy, works out of the box, replaces entire categories of internal infra.

Founded by Ruben Fiszel (ex-Palantir), who saw the need for enterprise workflow infrastructure but realized it had to be open-source, developer-focused, and built for best-in-class performance and DX - not another Spark wrapper.

300+ enterprise customers, 3M ARR, profitable. Tier 1 investors (YC, Google, Bessemer). Team of 10 engineers. Our customers run between 2 and 600 workers, 1 to +1,000 seats.

Revenue model: the core platform is fully open-source with thousands of individuals and companies using it for free. ~5% of features (enterprise-scoped: SSO, audit logs, dedicated workers, etc.) live in a private repository that companies pay to access, along with premium support. All revenue to date has been generated with zero outbound sales and modest marketing - purely inbound and product-led.