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Ruben Fiszel is the founder of Windmill, the open-source, self-hostable platform for workflows, apps and AI agents. Before Windmill, he was a software engineer at Palantir, working on distributed systems and developer tooling. He holds an MSc in computer science from EPFL and did his master's thesis research on compilers at Stanford.
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How is dbt actually orchestrated, and why does running it as one job beat one task per model? A primer on dbt as a compiler with a scheduler attached, the five ways teams wrap it, and why both Dagster and astronomer-cosmos converged on a single dbt invocation with per-model state projected out of it.
Introducing workflow-as-code: define complex workflows in TypeScript or Python with checkpointing, parallelism, and fault tolerance built in.
Introducing AI sandboxes: run Claude Code, Codex, or custom agents in isolated environments with persistent volumes on Windmill.
Introducing full-code apps: build React or Svelte frontends connected to backend runnables in 25+ languages, with a typed API and local dev workflow.
Define components in React or Vanilla JS that interact with the rest of your app.
Why is Windmill the fastest self-hostable workflow engine and job processing framework
Execute jobs targeting a script much faster than normal workers.
Write scripts & flows in your code editor with a UI preview.