Jonatan Dahl
Staff Software Engineer · SPOTIFY
Jonatan Dahl is a staff engineer at Spotify working across Fleet Management, AI, coding agents, and developer experience. He builds tools and systems in Portal, Spotify's internal developer platform powered by Backstage, that help engineering teams move faster and operate software at scale. Jonatan is focused on how AI and intelligent automation can transform the developer experience, making everyday workflows simpler, reducing cognitive load, and helping engineers spend more time on the work that matters.
PRESENTATIONS
Scaling code health with always on rewrites and AI
Managing thousands of components across millions of lines of code is a massive challenge. At Spotify, we moved from manual multi-month migrations to a fleet-first mindset, using tools like OpenRewrite and AI-powered background coding agents to run automated, daily code refactorings and infrastructure optimisations.
This talk covers how we scaled to over one million automated changes, our evolution from deterministic recipes to agentic loops, and how we use test automation and LLM judges to maintain quality.