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RAG for Codebases (Repo QA) (EXPLAINED)

Project BasedRAGHard25 min read

Hard RAG interview question on rag for codebases (repo qa) — architecture, trade-offs, eval, and production patterns.

TL;DR — Quick Answer

Chunk by AST/function boundaries; index README, symbols, and docstrings; combine semantic search with ripgrep for exact matches; reindex incrementally on push; include path, language, and commit SHA metadata.

The Interview Question

Design RAG for codebase Q&A over a monorepo with 2M LOC. How do you chunk, index, and keep results fresh on every push?

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