test-driven-development
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Test Double Sold Itself to Its Employees - Then Went Hunting for Bigger Software Problems
The Ohio consultancy built a business by rescuing developers from bad incentives. Now its employee-owners are betting that the useful edge in AI-era software is judgment, not faster typing.
Kent Beck
Kent Beck is the creator of Extreme Programming (XP) and a pioneer of Test-Driven Development, pair programming, and the Agile Manifesto. A programmer with 52+ years of experience, he co-created JUnit with Erich Gamma, co-invented CRC cards and design patterns in software with Ward Cunningham, and spent seven years coaching at Facebook. Today he runs the 'Software Design: Tidy First?' Substack newsletter (123,500+ subscribers in 195 countries), hosts the Still Burning podcast, and explores augmented human-AI coding. In April 2026 he publicly announced a Parkinson's disease diagnosis, continuing his mission to help technologists feel safe in the world.