👋 Hi, I'm Eugene Yan

I build recommendation systems and AI-powered experiences that serve customers at scale. Currently, I'm a Principal Applied Scientist at Amazon. Outside of work, I also...

• Write, speak, and prototype on ideas in machine learning, RecSys, and LLMs.
• Teach how to apply ML/LLMs effectively at ApplyingML.com & Applied-LLMs.org.
• Send a newsletter about data, ML, and what I'm learning to 10,000+ subscribers.
• In 2025 I'm learning: RecSys × LLMs, semantic IDs, long-context Q&A, and agents.
• Fun fact: I don't use the QWERTY keyboard (I use Dvorak instead).

📝 Recent Writing

• 2025 Year in Review - Sun, 14 Dec 2025
• Product Evals in Three Simple Steps - Sun, 23 Nov 2025
• Advice for New Principal Tech ICs (i.e., Notes to Myself) - Sun, 19 Oct 2025
• Training an LLM-RecSys Hybrid for Steerable Recs with Semantic IDs - Sun, 14 Sep 2025
• Evaluating Long-Context Question & Answer Systems - Sun, 22 Jun 2025

View the archives (209 posts) @ eugeneyan.com.