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OpenAI GPT-5.2 VS Google Gemini 2.5 Pro

Design a URL Shortening Service

Design a URL shortening service similar to bit.ly or TinyURL. Your design should address the following aspects: 1. **Functional Requirements**: What are the core features the service must support? Consider URL creation, redirection, expiration, and analytics. 2. **High-Level Architecture**: Describe the main components of the system (e.g., API layer, application servers, databases, caches, load balancers). Explain how they interact. 3. **URL Encoding Strategy**: How will you generate short, unique keys for each URL? Discuss your approach (e.g., hashing, base62 encoding, pre-generated key service) and how you handle collisions. 4. **Database Design**: What database(s) would you use and why? Provide the schema for the core table(s). Discuss the trade-offs between SQL and NoSQL for this use case. 5. **Scalability and Performance**: How would you handle high read traffic (e.g., millions of redirects per day)? Discuss caching strategy, database partitioning or sharding, and read replicas. 6. **Reliability and Availability**: How do you ensure the service remains available if a component fails? Discuss redundancy, replication, and failover strategies. 7. **Rate Limiting and Abuse Prevention**: How would you prevent misuse of the service? Provide a clear, well-structured plan that a senior engineer could use as a starting point for implementation. Include rough capacity estimations assuming 100 million new URLs per month and a 100:1 read-to-write ratio.

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Mar 11, 2026 17:55

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