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Product Software Engineer

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Hybrid (Paris/Geneva)€50k - €95kFull-timePosted 5mo ago

About the role

Open-source platform Windmill seeks a Product Software Engineer to build and ship the Windmill product end-to-end, focusing on developer tooling, AI-powered workflows, and agent-driven features. The role emphasizes strong product sense, deep code review of AI-written code, and ownership from spec to shipping.

Responsibilities

  • The editors. Build and refine the script, flow, app, raw app, and pipeline editors in Svelte / TypeScript. These are the heart of the product.
  • AI inside the product. Agent steps in flows, AI sessions that build scripts, flows and apps, skills, evals, trace inspection, and the agentic loop behind them. The agent loop and the interface around it are the same product.
  • Full ownership. Spec, design, direct the implementation, review it deeply, ship, iterate. Talk to users, ship what matters, cut what doesn't. No handoffs.

Qualifications

  • Excellent product taste in devtools.
  • Deep review of AI-written code. Knowledge of distributed systems, Rust, PostgreSQL, and Svelte / frontend: at least the minimum in ALL of them.

Skills

Required:SvelteTypeScriptRustPostgreSQL
Nice to have:AI / LLM skills
Last updated Oct 14, 2026. Interested? Apply on the company site.
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About Windmill

Open-source platform to turn scripts into internal apps & workflows

Windmill is an open-source developer platform to quickly build production-grade multi-step internal apps, workflows and integrations from minimal Python and Typescript scripts. Open-source alternative to Airplane and Pipedream. Simplified temporal with automatic app generation. Usable as a self-hosted AWS Lambda. Sync your scripts from your github repo or write them directly on Windmill, have them be converted to apps and no-code modules automatically. Use those apps as standalone or, build powerful flows using either those scripts or scripts made by the community on hub.windmill.dev. The experience is similar to no-code tools except that at any point, any module can have its code inspected and tweaked. Leveraging the open-source community, we will build an exhaustive library of scripts for all apis and generic tasks. You may also wrap Windmill with your own frontend to provide automation as a feature on top of your own SaaS. Focus on your business logic for all kind of flows, Windmill is the platform to build, share and run them.

developer-toolssaasb2bworkflow-automationopen-source

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