AI Agent Evaluation Developer for RAG Document Workflow POC

We're looking for a developer to build a compact document agent We'll supply a single large PDF or Markdown file. The agent should be able to: Answer questions based on the document Query the document repeatedly as needed Refine its searches whenever the evidence gathered is insufficient Produce a structured report or brief that includes citations Log the complete agent trace Google ADK is the preferred framework, though LangChain or another open-source alternative is acceptable. You're free to design the chat interface using whichever AI tools you prefer.