Capstone: Enterprise Document Q&A

1. The Exercise

The most-asked GenAI system design question in current interview loops, word for word:

"Design an internal AI assistant that lets our 20,000 employees ask questions over everything the company knows: Confluence, Google Drive, Slack, Jira, and the HR system. It must respect document permissions: people can only get answers from content they're allowed to see."

Every lesson in this module maps onto one slice of this problem. And one requirement, the permissions clause, quietly ends up dominating the whole architecture