Design
E-Book Lending Platform
Design a digital library lending platform (like a Kindle library) supporting borrowing, returning, and licensing limits.
01 - Why interviewers ask this
Limited-license lending forces you to design a fair waitlist and expiry system — interviewers check that returns/expiries release capacity correctly rather than leaking "phantom" holds.
02 - Where this system exists in the real world
You interact with this design every day.
Kindle Lending Library / Libby / OverDrive
Corporate digital training material licensing
Academic e-textbook lending platforms
03 - What you'll master
Solve this once. Know it forever.
Model limited concurrent licenses per title
Implement a fair FIFO waitlist with claim windows
Enforce loan expiry without relying on the client
04 - What you'll design
6 functional · 2 non-functional requirements.
Borrow an available e-book copy for a fixed loan period
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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