Machine Learning System Design Interview, issue 12, Nov 29, 2025
The LoRA Knowledge Trap
Senior ML System Engineer interview at Meta, and the interviewer asks:
“We need to adapt Llama-3 70B to the highly technical Medical domain. We are GPU-constrained, so we can’t do full fine-tuning. How do we proceed?”
Why standard LoRA only teaches “doctor style,” not medical expertise - and how the Hyper-Adaptation Trifecta fixes it.
The full answer, with the mechanism and the arithmetic, is for paid subscribers on Substack.