How would you design a URL shortener like bit.ly?
Reviewed by Gurusankar M.
☕Coffee Chat Question
Concept Made Simple
“How would you design a URL shortener like bit.ly?”
🧠Mind Map Answer
Remember It Faster
Core job: map a short code to a long URL, then redirect. The interesting parts are the key generation and the read-heavy scale.
🔥What If?
Think Beyond the Expected
How do you guarantee short codes are unique without a central bottleneck?
Pre-allocate ranges of IDs to each app server (a key-generation service hands out blocks), or use a distributed counter like a ZooKeeper/Snowflake-style ID. Each server then Base62-encodes from its own range — no contention.
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Plain-language foundations
I'm preparing for a software engineering interview and want to understand this from scratch, as a beginner. Topic: Scaling (System Design) Interview question: "How would you design a URL shortener like bit.ly?" Please: 1. Explain the core idea in simple, plain language, using an everyday analogy. 2. Define any technical terms you use. 3. Walk through one small, concrete example. 4. Finish with a single sentence I can easily remember. Keep the tone friendly and assume I'm new to this topic.
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