RAG-Powered PDF QA Platform

I’m building a full-stack, AI-driven platform that lets people drop a PDF into the browser, log in with a simple username/password, and immediately start asking factual or concept-clarification questions about its content... (Budget: $15 - $25 USD, Jobs: FastAPI, Full Stack Development, Java, JavaScript, LangChain, PHP, Python, REST API, Software Architecture, Vector Databases)