Ride-Sharing Service (Uber-class) request → match → live tracking → payment · 20M riders · 1M concurrent drivers · 250K pings/s · 1.5M sockets
arrows 0/26cards 14letters A–N
happy-path side-effect failure-comp new-infra
BOTE — canonical numbers (every N- chip in the rail links here)
Failure playbook (A–N)
What breaks first · interview framing