Recent advances in large language models have created unprecedented opportunities for organisations to streamline operations, reduce costs, and improve productivity at scale. We believe organisations of the future will combine human and machine intelligence to learn, master, and apply AI capabilities quickly and effectively.This course provides a comprehensive, practical introduction to LLM application development using the open-source ecosystem. Learners explore pretrained models from the Hugging Face repository, work directly with the Transformers API, and build task-specific and generative solutions. The course progresses from Transformer fundamentals to multimodal architectures and agentic orchestration using LangChain, equipping participants to design safe, scalable, and enterprise-ready LLM-powered applications.