Last-mile route planning
Design the last-mile route-planning system for a parcel-delivery operation: each morning assign ~50k packages across ~2k vans in a metro, producing per-van ordered stop sequences that respect time windows, vehicle capacity, and driver shift length, then adapt mid-day as failed deliveries and new urgent orders arrive. Cover how you model the problem, scale the optimization, and replan dynamically.
What a strong answer looks like
Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts (data model, bottlenecks, consistency, failure modes) and name the trade-offs you are making.
Clarify5:30 left
Estimate5:30 planned
Design16:30 planned
Deep dive13:30 planned
Failure9:00 planned
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.