Design
Amazon Locker System
Design Amazon's package locker system where packages are stored in lockers and customers retrieve them using a one-time code.
This is a Low-Level Design (LLD) problem. New to LLD vs HLD? Start here.
01 - Why interviewers ask this
It's a focused resource-allocation problem — interviewers use it to see how you size/assign lockers by package dimensions and handle pickup-code security cleanly.
02 - Where this system exists in the real world
You interact with this design every day.
Amazon Locker / parcel pickup point networks
Package room management in apartment buildings
Click-and-collect retail pickup systems
03 - What you'll master
Solve this once. Know it forever.
Assign resources (lockers) by size constraints
Generate and validate secure pickup codes
Handle locker expiry and reassignment
04 - What you'll design
6 functional · 4 non-functional requirements.
Assign an available locker of appropriate size for a package
5 more requirements inside
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05 - Companies that ask this
You may face this exact question in your next interview.
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