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Substack
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Latest Issues

Harness Engineering Roadmap: Claude Code From First Principles

The fastest way to learn harness engineering? Build Claude Code from scratch.

Why harness engineering? LangChain kept the same model and changed only the harness. Their coding agent went from 53% to 67% on Terminal-Bench, a top coding-agen...

5 days ago
32
2

Building a Support Chatbot on Amazon Bedrock

Paul: Today, the spotlight is on Marcelo Acosta.

He’s an AWS-certified Solutions Architect with more than 30 years in technology, focused on data, machine learning, and practical AI systems. He writes Build with AWS, where he helps softwar...

7 days ago
7

4 Key Decisions to Solidify Your Harness

Paul: Today, the spotlight is on Tejas Kumar.

He’s an AI Engineer at IBM in Berlin, the bestselling author of Fluent React, and the host of the ConTejas Code podcast. At tej.as, he digs into the mechanics of agent harnesses, bringing the p...

11 days ago
12

Build an LLM Wiki From First Principles

When I was researching about harness engineering I asked Claude Code to compare 7 large repos: Claude Code’s leaked source, OpenCode, Pi and a bunch more. Directly pointing Claude Code to these repos was a mess, generating superficial answe...

19 days ago
33

Context Inspector: Measuring Context Quality Before the LLM Call

Paul: Today, Decoding AI features two engineering leaders from American Express, Thangavel Subramaniam and Saurabh Gupta.

Thangavel is a Senior Software Engineer focused on applied ML and scalable software solutions built with cloud techno...

21 days ago
12
5

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Authors

The writers behind this newsletter.

  • Paul Iusztin

    Senior AI Engineer • Founder @ Decoding AI • Author @ LLM Engineer’s Handbook ~ I ship AI products and teach you about the process.

  • Alejandro Aboy

    Data & AI, changed my job title so much over the last years that you can say I am a Forward Whatever Engineer.

  • Louis-François Bouchard

    Focused on making AI accessible. What's AI on YouTube, Spotify, Apple Podcasts. Co-founder @towards_ai. ex Ph.D. student @Mila_Quebec @polymtl.

  • Johannes Millan

    Software developer and creator of Super Productivity and Parallel Code. Building open-source tools for focused work and exploring how AI coding agents can help developers tackle complex projects.

  • Hugo Bowne-Anderson

    I help teams build with AI. I’m an independent data and AI consultant who’s advised and taught engineers from Netflix, Meta, and Amazon, and written about data science and AI for publications such as Harvard Business Review and VentureBeat.

  • Tejas Kumar

    AI Engineer at IBM in Berlin, best selling author of Fluent React (O'Reilly), keynote speaker and host of ConTejas Code. I write about AI engineering and React at tej.as and train teams in both.

  • Alexey Grigorev

    15 years of experience. Teaching AI and Data to 100k+ students. Founder of DataTalks.Club · Creator of the Zoomcamp Series · ML Engineer & Author

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