The BuildTheSystem blog
Practical guides on system design interviews — how to prepare, how to work through the questions that actually get asked, and the mistakes that quietly sink otherwise-solid candidates.
Design a Rate Limiter: A System Design Interview Walkthrough
How to answer the rate limiter system design question — token bucket vs. sliding window, where to enforce the limit, and how to make it work across multiple servers.
Read the post7 System Design Interview Mistakes That Get Candidates Rejected
The recurring mistakes that sink otherwise-solid system design interview performances, from skipping requirements to silent whiteboarding.
Read the postHow to Design a URL Shortener (Bitly): The Complete Guide
Learn how to design a URL shortener step by step — short code generation, redirect-path caching, and data storage trade-offs — then rehearse the exact same question out loud in a live mock interview.
Read the postHow to Prepare for a System Design Interview
A practical study plan for system design interviews: what interviewers actually score, how to structure 45 minutes, and why reading alone doesn't get you there.
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