The Death of Writing Code: OpenAI's Engineer on the Rise of Harness Engineering

Coding Chats Episode 77 — Arnaud Fournier, Forward Deployed Engineer at OpenAI, talks to John Crickett about how AI is fundamentally reshaping software engineering. He explores how OpenAI's own engineers have largely moved away from writing code line-by-line, shifting instead to what he calls "harness engineering" — orchestrating agents, preparing context, and steering AI to do the heavy lifting.

The conversation covers practical ground for engineers at every level: how to successfully adopt agentic coding in your workflow, best practices for integrating tools like Codex into enterprise environments, and what it's really like to work at the frontier of AI deployment across industries like semiconductors, life sciences, and finance.

Chapters

00:00 Understanding the Role of Forward Deployed Engineers

03:21 The Integration Process: Challenges and Solutions

06:25 Optimizing AI Solutions with Codex

09:38 Leveraging Codex for Team Efficiency

12:28 Best Practices for Using Codex in Engineering Workflows

15:29 Setting Up for Success in Enterprise AI Projects

18:26 Navigating Stakeholder Engagement and Requirements

21:16 The Future of AI in Enterprise Solutions

25:53 Building Proof of Concept Solutions

28:33 Collaborative Development and Model Improvement

30:45 The Rise of Codex and User Adoption

33:36 Integrating AI into Software Development

36:10 Standardization vs. Customization in AI Tools

39:05 The Evolving Role of Forward-Deployed Engineers

42:48 Understanding the FDE Role at OpenAI

46:10 The Recruitment Process at OpenAI

49:50 Exploring Related Content

49:58 Outro Final Coding Chats.mp4

Arnaud's Links

https://www.linkedin.com/in/arnaudfrn/

https://openai.com/index/introducing-openai-frontier/

https://community.openai.com/t/introducing-the-new-codex-for-almost-everything/1379125

https://openai.com/index/scaling-codex-to-enterprises-worldwide/

John's Links:

John's LinkedIn: https://www.linkedin.com/in/johncrickett/

John’s YouTube: https://www.youtube.com/@johncrickett

John's Twitter: https://x.com/johncrickett

John's Bluesky: https://bsky.app/profile/johncrickett.bsky.social

Check out John's software engineering related newsletters: Coding Challenges: https://codingchallenges.substack.com/ which shares real-world project ideas that you can use to level up your coding skills.

Developing Skills: https://read.developingskills.fyi/ covering everything from system design to soft skills, helping them progress their career from junior to staff+ or for those that want onto a management track.