Design
Stack Overflow / Q&A Platform
Design a developer Q&A platform like Stack Overflow with questions, answers, votes, tags, reputation, and search.
This is a Low-Level Design (LLD) problem. New to LLD vs HLD? Start here.
01 - Why interviewers ask this
Reputation and voting systems are a great test of denormalized-but-consistent counters — interviewers check if you keep vote counts correct without recomputing from scratch on every read.
02 - Where this system exists in the real world
You interact with this design every day.
Stack Overflow / Quora-style Q&A platforms
Community forums with reputation systems
Product review and rating platforms
03 - What you'll master
Solve this once. Know it forever.
Model questions, answers, comments, and votes
Implement a reputation/scoring system
Design tagging and search for content discovery
04 - What you'll design
8 functional · 3 non-functional requirements.
Users post questions with a title, body, and tags
7 more requirements inside
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05 - Companies that ask this
You may face this exact question in your next interview.
Ready?
Open the canvas.
Design it yourself.
See all requirements, use staged hints, run your code, and compare with community discussions - all on the same canvas.