MQNotebook — Enterprise RAG System Python, LlamaIndex, OCR, Hybrid Search Built a local RAG engine ingesting scanned PDFs, PPTX, XLSX with custom OCR pipeline. Implemented hybrid sparse/dense retrieval with cross-encoder reranking, improving context precision by 40%. Reduced token usage by 60% via optimized context injection and chunking strategy. Deployed to Streamlit Cloud with BYOK security.