Your question is Deep Dive: Favorite Technical Project. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Walk me through a deep dive of your favorite technical project.
Choose a project you know well and explain its architecture, the most important execution path, your individual contribution, and the technical trade-offs behind key decisions. Be prepared to discuss performance, concurrency, failure handling, testing, debugging, and what you would change now. Keep the discussion focused on how the system actually worked rather than only describing its business purpose.