Windmill (YC S22) — Open-source platform to turn scripts into internal apps & workflows
Windmill is an open-source developer platform that turns scripts into workflows, internal tools, and full-stack apps. Write scripts in Python, TypeScript, Go, Bash, Rust, SQL - Windmill auto-generates UIs from their parameters, handles dependencies, credentials, permissions, and scheduling so you focus on business logic, not infra.
Windmill is a Y Combinator company in the Summer 2022 batch. Its directory entry describes it as: Open-source platform to turn scripts into internal apps & workflows. The founder listed is Ruben Fiszel (Founder) (Y Combinator directory entry, May 6, 2022).
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Windmill is an open-source developer platform that turns scripts into workflows, internal tools, and full-stack apps.
Write scripts in Python, TypeScript, Go, Bash, Rust, SQL - Windmill auto-generates UIs from their parameters, handles dependencies, credentials, permissions, and scheduling so you focus on business logic, not infra.
Open-source alternative to Airflow, Temporal, Retool and n8n. Chain scripts into flows with branching, parallelism, retries. Build dashboards with the app builder. Trigger via cron, webhook, or UI. All-in-one runtime, editor, secret manager, and OAuth platform - enterprise-ready out of the box.
Stack: Rust / TypeScript + Svelte / PostgreSQL. Self-hostable, easy to deploy, built for performance and DX.
Ruben Fiszel
Founder
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
One of 344 companies held here in B2B › Infrastructure.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
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Example from a real report (our sample on Target): “The Q2 2026 earnings report, published August 19, 2026, showed adjusted EPS of $2.46 against an expected $2.33” Source: CNBC
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The Short Answer
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The Money: Funding, Valuation, Runway
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Warning Bells
Sources
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