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5 ARTICLES / FREE TO READRate Limiter System Design: Token Bucket to Distributed Scale
Design a distributed rate limiter with token bucket math, algorithm comparisons, Redis atomicity, regional quotas, and clear failure policies.
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SQL vs NoSQL: How to Choose in a System Design Interview
Choose SQL or NoSQL using real access patterns, data models, consistency requirements, and an online-store example with diagrams and decision tables.
Read the guide5 Caching Strategies: Tradeoffs, Invalidation, and Stampedes
Compare cache-aside, read-through, write-through, write-behind, and write-around. Design for invalidation races, stampedes, and cache outages.
Read the guideURL Shortener System Design: From Short Codes to Scale
Design a URL shortener with capacity estimates, Base62 IDs, collision handling, redirect caching, editable links, and asynchronous analytics.
Read the guide+ reserve(seatId)+ confirm(holdId)+ release(holdId)HLD vs LLD: 7 Key Differences, Explained with One System
Learn the difference between high-level and low-level design through a ticket booking system, architecture diagrams, code, and an interview checklist.
Read the guideMake the architecture click.
Explore visual concepts, then put your decisions to the test.