Amazon's system design round lasts minutes. Interviewers evaluate areas:
Requirements gathering. Do you ask clarifying questions before designing?
High-level architecture. Can you draw the major components and their interactions?
Component design. Can you zoom into one component and explain it in detail?
Scalability. How does your design handle x or x growth?
Trade-offs. Can you articulate why you chose one approach over another?
Amazon maps these to LPs: Ownership (your design decisions), Think Big (can it scale?), and the ability to go deep into details.