You'll be asked: "Tell me about a project you're proud of."
Structure your answer:
Context: Business problem and why it mattered
Approach: Technical choices and why you made them
Challenges: What went wrong and how you solved it
Impact: Measurable results (latency, accuracy, revenue)
Tailor depth to audience: For ML interviewers, go deep on architecture. For hiring managers, focus on business impact.
Interview tip: Prepare - projects at different depths. Know which details to include or skip based on time.