System design interviews broke me — until I found this framework

I bombed three system design interviews in a row. Not because I didn't know the technology — I'd been building distributed systems for four years. I failed because I had no structure.

The problem with most candidates

Most engineers approach system design interviews the same way they approach actual system design: dive into the problem, start sketching boxes and arrows, get lost in implementation details. That works when you're actually building something. It's a disaster in an interview.

Interviewers aren't evaluating whether you know how to build a URL shortener. They're evaluating how you think. Your communication. Your ability to make tradeoffs explicitly.

The framework that changed everything

After studying how the top performers approach these rounds, I started using a consistent 5-step framework: Requirements → Scale estimation → High-level design → Detailed design → Tradeoffs. Not revolutionary, but doing it consistently and out loud is what matters.

"The goal isn't to get the right answer. It's to demonstrate that you can navigate ambiguity under pressure."

What the video gets right

This breakdown covers exactly the mental model shift you need: stop trying to impress interviewers with your knowledge of specific technologies and start demonstrating how you decompose complex problems. The section on capacity estimation alone is worth watching — most candidates skip it entirely, and it's actually a signal that you've built things at scale.

I now use this framework for every system design question, not just interviews. It's made me a better engineer and a much better interviewer when I'm on the other side of the table.