Building Data-Driven Applications with LlamaIndex: A practical guide to RAG pipelines, agentic workflows, and production AI deployment

Build data-grounded AI applications with LlamaIndex through hands-on examples covering RAG pipelines, agentic workflows, multi-agent systems, prompt engineering, evaluation, and deployment with Python and Streamlit.Free with your book: DRM-free PDF version + access to Packt's next-gen Reader*Key FeaturesBuild complete RAG pipelines from ingestion to deployment with practical working examplesDesign agentic workflows and multi-agent architectures for production-ready AI systemsDevelop a hands-on project from a simple LLM app to a deployed AI-powered web applicationRun everything locally with Ollama - no API keys or costs requiredBook DescriptionLarge language models can generate impressive responses, but they often struggle with outdated knowledge, limited access to proprietary data, hallucinations, and inconsistent reasoning in real-world applications. LlamaIndex addresses these challenges through RAG, enabling developers to connect LLMs with external data sources and build more reliable AI applications.This fully updated second edition reflects the latest evolution of the LlamaIndex ecosystem. You will learn how to ingest and parse data from multiple sources, build optimized indexes, and implement advanced retrieval strategies for high-quality RAG applications.The book introduces modern agentic AI patterns using LlamaIndex Workflows, chat engines, agents, and multi-agent orchestration. You will also explore observability and RAG evaluation, prompt engineering best practices, and deployment strategies using Streamlit.Throughout the book, you will build a practical Contract Review Expert application that evolves chapter by chapter from a simple query engine into a fully deployed AI-powered web application. You will also learn how to use enterprise tooling such as LlamaParse alongside open source alternatives such as LiteParse.By the end of this book, you will be able to design, build, evaluate, and deploy scalable LlamaIndex applications grounded in your own data.*Email sign-up and proof of purchase requiredWhat you will learnUnderstand the LlamaIndex ecosystem and core use casesMaster techniques to ingest and parse data from diverse sourcesBuild optimized indexes for RAG applicationsQuery data using retrievers, postprocessors, and response synthesizersDesign agentic workflows and multi-agent systemsDeploy AI applications with Python and StreamlitEvaluate and tune your RAG implementation using observability tools and key metricsApply prompt engineering best practices to improve AI responsesWho this book is forThis book is for Python developers with a basic knowledge of LLMs who want to build interactive, generative, and agentic AI applications grounded in proprietary data. Experienced developers and AI practitioners will also benefit from the advanced techniques covered like agentic workflows, multi-agent orchestration, RAG evaluation, and enterprise tooling. A working knowledge of Python and familiarity with generative AI concepts is assumed.The book is aimed at those with a basic knowledge of Python and working knowledge in developing applications using Generative AI models.Table of ContentsUnderstanding Large Language ModelsLlamaIndex: The Hidden Jewel - An Introduction to the LlamaIndex EcosystemKickstarting Your Journey with LlamaIndexIngesting Data into Our RAG WorkflowIndexing with LlamaIndexQuerying Our Data, Part 1 – Context Retrieval(N.B. Please use the Read Sample option to see further chapters) Read more