Question 1

Are the system design solutions free?

Accepted Answer

Yes. Every worked solution on this page is free to read with an account - no paid tier, no upsell mid-article. The paid tiers cover live AI mock interviews and unlimited practice sessions, not the written solutions.

Question 2

What does a "worked solution" include?

Accepted Answer

A walkthrough of all 8 HLD steps (or 6 LLD steps for LLD problems): requirements clarification, capacity estimation, API design, high-level architecture diagram, database choice, caching, scaling, and trade-offs. HLD solutions include a mermaid architecture diagram you can copy; LLD solutions include class diagrams and code.

Question 3

How do these compare to the system design YouTube videos?

Accepted Answer

These are written, scannable, and built around the exact step structure an interviewer expects you to follow. You can skim to the part you're weak on (e.g. capacity estimation) without sitting through a 40-minute video.

System Design Solutions