How to Move from Prompt Engineering to Harness Engineering in Testing with Matt Wynne

About This Episode:

Matt Wynne, co-creator of Cucumber and BDD practitioner, joins Joe for the first time in over a decade to talk about what two years inside a Silicon Valley AI startup taught him about the future of software testing.

Matt spent time at Mechanical Orchard working alongside experienced XP practitioners to modernize legacy COBOL mainframes using LLMs, and then spent a week with the team that coined the term “software factory," where the rule was simple: humans never write the code, never read the code. In this episode,

Matt breaks down what harness engineering actually means, why shared understanding is still the real bottleneck even in an agentic world, and how testers can use multiple LLMs to review AI-generated pull requests without reading every line.

He also gets honest about the grief that comes with realizing you can encode years of hard-won expertise into a Markdown file, and why that does not mean your skills are worthless.

If you are working in a brownfield codebase, wondering how to handle the flood of agentic PRs, or trying to figure out where testers fit in a world where agents write the code, this conversation is worth your time.

Find Matt at mattwynne.net and leansoftware.ai

Also check out his course Build a Software Factory: Hands-off agentic coding for experienced engineers: https://testgld.link/mattcourse

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About Matt Wynne

Matt Wynne is a BDD pioneer, Cucumber co-founder, and creator of Example Mapping. He has been programming since the mid-1980s and working with agile practices since discovering the C2 Wiki in 2001. He joined Cucumber in 2008, co-authored The Cucumber Book, co-founded Cucumber Ltd, and helped thousands of teams learn Behaviour-Driven Development through the video-based training course Cucumber School and in-house and public trainings. Along the way he created Example Mapping, a lightweight practice for turning fuzzy conversations into shared concrete examples. He is motivated by one question: how do we help humans and machines build stuff that matters?

Connect with Matt Wynne

• • Company: leansoftware.ai
  • Blog: mattwynne.net
  • LinkedIn: www.mattwynne

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