Weijian Zhang

I write about production AI, model behaviour, and decision-making under real-world constraints — for builders, technical leaders, and curious operators who care about substance over hype.

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My work sits at the intersection of production LLM systems, model evaluation and fine-tuning, AI product design, and the mental models needed to think clearly in fast-moving technical environments.

This site is where I collect what I’m learning, building, and testing in public.