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Hamel’s Blog

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I am a machine learning engineer with over 20 years of experience. I have worked with innovative companies such as Airbnb and GitHub, which included early LLM research used by OpenAI, for code understanding. I have also led and contributed to numerous popular open-source machine-learning tools. I am currently an independent consultant helping companies build AI products. I am currently teaching a course on AI Evals For Engineers & PMs from July 21 - August 22, 2025. If you need more hands-on help, I’m open to new consulting work and other forms of advisory. If you need help with your project, you can find more information here. I often share my experience building AI products. Below is a selected assortment of my longer-form writing. The best way to follow my activity is Twitter.

🎓 Learn With Me I co-teach AI Evals for Engineers and PMs, with over 5,000 students from 500+ companies (including OpenAI, Anthropic, and Google). Check the page for upcoming cohorts. I often share my experience building AI products. Below is a selection of my long-form writing. Date Title 8/12/26 AI Product Engineering Notes 7/11/26 Do Automated Evals Work? 6/29/26 “It’s Hard to Eval” Is a Product Smell 3/26/26 The Revenge of the Data Scientist 3/2/26 Evals Skills for Coding Agents 1/18/26 Why I Stopped Using nbdev 10/1/25 Selecting The Right AI Evals Tool 7/11/25 Stop…

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