Context engineering with Dex Horthy

July 15
1h 32m

View Transcript

Episode Description

Brought to You By:

Antithesis verify your system’s correctness without human review or traditional integration tests – and avoid bugs or outages.

BuildkiteCI software built to absorb whatever your coding agents throw at the build queue.

Sentryapplication monitoring software considered “not bad” by millions of developers.

Knowing how LLM contexts work and how to work around context limitations – aka “context engineering” – is becoming more important for software engineers working with LLMs. Let’s look into what works and what doesn’t, today.

In this episode of The Pragmatic Engineer podcast, I sit down with the CEO and cofounder of HumanLayer, Dex Horthy, who coined the term “context engineering”. We discuss the ideas behind this context engineering, harness engineering, loop engineering, software factories, why his approach to AI-assisted software development has evolved, and how HumanLayer is helping engineering teams automate more of the software development lifecycle without sacrificing code quality.

Timestamps

00:00 Intro

03:35 Dex’s path into tech

05:36 Early work in platform engineering

07:30 Replicated

13:26 Metalytics

14:38 12-factor agents

20:29 Context engineering

25:40 Harness engineering

28:13 Context overload

32:47 Loop engineering

46:36 Software factories before and after AI

52:35 Automation limits

57:20 Three options for automating

1:01:02 RPI framework

1:06:18 Intentional compaction

1:13:50 Token harder vs. token smarter

1:18:46 AI slop

1:21:17 HumanLayer

1:31:11 Book recommendation

The Pragmatic Engineer deepdives relevant for this episode:

How Uber uses AI for development: inside look

Are AI agents actually slowing us down?

AI Tooling for Software Engineers in 2026

Vibe Coding as a software engineer

How Claude Code is built

AI Engineering in the real world

The AI Engineering Stack

How AI-assisted coding will change software engineering: hard truths

The creator of OpenClaw: "I ship code I don't read"

Production and marketing by ⁠⁠⁠⁠⁠⁠⁠⁠https://penname.co/⁠⁠⁠⁠⁠⁠⁠⁠. For inquiries about sponsoring the podcast, email podcast@pragmaticengineer.com.



Get full access to The Pragmatic Engineer at newsletter.pragmaticengineer.com/subscribe
See all episodes