Ramchand Kumaresan is a Senior Program Manager at Procore Technologies and the founder of Murai Labs, a small AI research lab he runs solo from outside Austin. His arXiv work includes KALAVAI, UYIR, and Orion. He started writing this book because he kept meeting engineers who could ship against the OpenAI API but couldn't explain a logit — and realized he was one of them. Eighteen months later, this is the book he wished he'd had.