Design a multi-carrier parcel delivery system

Q: Design a multi-carrier parcel delivery system

This is a System Design interview question from Walmart Labs for Software Engineer roles. View the full question and solution on PracHub.

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Question

Design a system for shipping customer parcels that supports multiple delivery partners/carriers (e.g., UPS, USPS, FedEx).

Your system should enable an e-commerce platform (or warehouse) to:

Create a shipment for an order (addresses, package details).
Choose or be assigned a carrier and service level.
Purchase shipping / generate a label.
Track shipment status through delivery.
Handle carrier-specific differences while providing a unified internal API.

Include key APIs, data model, main components, integrations with carriers, and how you ensure reliability and scalability.

Design a multi-carrier parcel delivery system

Solution

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