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Martin Fowler is one of the most influential people within software architecture, and the broader tech industry. He is the Chief Scientist at Thoughtworks and the author of Refactoring and Patterns of Enterprise Application Architecture, and several other books. He has spent decades shaping how engineers think about design, architecture, and process, and regularly publishes on his blog, MartinFowler.com.

In this episode, we discuss how AI is changing software development: the shift from deterministic to non-deterministic coding; where generative models help with legacy code; and the narrow but useful cases for vibe coding. Martin explains why LLM output must be tested rigorously, why refactoring is more important than ever, and how combining AI tools with deterministic techniques may be what engineering teams need.

We also revisit the origins of the Agile Manifesto and talk about why, despite rapid changes in tooling and workflows, the skills that make a great engineer remain largely unchanged.

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Timestamps

(00:00) Intro

(01:50) How Martin got into software engineering

(07:48) Joining Thoughtworks

(10:07) The Thoughtworks Technology Radar

(16:45) From Assembly to high-level languages

(25:08) Non-determinism

(33:38) Vibe coding

(39:22) StackOverflow vs. coding with AI

(43:25) Importance of testing with LLMs

(50:45) LLMs for enterprise software

(56:38) Why Martin wrote Refactoring

(1:02:15) Why refactoring is so relevant today

(1:06:10) Using LLMs with deterministic tools

(1:07:36) Patterns of Enterprise Application Architecture

(1:18:26) The Agile Manifesto

(1:28:35) How Martin learns about AI

(1:34:58) Advice for junior engineers

(1:37:44) The state of the tech industry today

(1:42:40) Rapid fire round

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The Pragmatic Engineer deepdives relevant for this episode:

• Vibe coding as a software engineer

• The AI Engineering stack

• AI Engineering in the real world

• What changed in 50 years of computing

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