This repository accompanies the LLM Engineer’s Handbook book, providing end-to-end code examples for constructing LLM applications. It covers data collection and generation, LLM training pipelines with fine-tuning, RAG system implementation, production-ready AWS deployment, comprehensive monitoring, and testing/evaluation frameworks. The book includes a final trained model (TwinLlama-3.1-8B-DPO) deployed on Hugging Face.