From Tokens to Test Suites: Understanding How LLMs Work for QA Engineers

Who this is for: Senior QA / Automation Engineers transitioning into AI and LLM testing. This blog is structured in two parts: first we go deep on how LLMs actually work (grounded in Andrej Karpathy's "Deep Dive into LLMs"), then we use that foundation to reason clearly about how to test them. Understanding the internals is not optional. If you don't know why an LLM hallucinates, you can't design a test that catches it. Table of Contents Part 1 — How LLMs Actually Work...