System designHardsd-g145

Subject Delivery dispatchLevel Senior–Staff~50 minCommon in Distributed systems interviewsIndustries Technology

Question

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.

Learn the concepts

Narrate your design

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Run or narrate your approach, then ask the coach.