Weijian Zhang
I build tools for open-weight models and software that agents can use
Right now I’m building Tuned Tensor, a feedback loop for defining model behaviour, fine-tuning open-weight models, catching regressions, and turning failures into the next dataset.
Recent experiments include a local 2B email-triage model, an autonomous loop for prompt-injection classifiers, and Deeper Level, a chess interface that shows the model’s candidate moves and critique.
recent writing
| Jun 28, 2026 | Why I built a local 2B email triage model |
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| Jun 13, 2026 | When Agent Loops Stop Moving |
| May 02, 2026 | Building Software for Agents |