Design
Library Management System
Design a library system that manages books, members, and borrowing/returning operations with fine calculation.
01 - Why interviewers ask this
Everyone has intuition for how a library works, so interviewers use it to see how you turn a familiar process into clean entities and state transitions without any hand-holding.
02 - Where this system exists in the real world
You interact with this design every day.
University and public library catalog systems
Corporate equipment/asset lending systems
Video rental and tool-library membership apps
03 - What you'll master
Solve this once. Know it forever.
Design many-to-many relationships (books, copies, members)
Model due dates, fines, and reservation queues
Separate catalog data from per-copy lending state
04 - What you'll design
7 functional · 4 non-functional requirements.
Members can search books by title, author, subject, or publication date
6 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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