40 skills · 487 questions · 5 min/day
Stop reading.
Start building.
System design interview prep that actually sticks. You practice instead of passively reading.
Modeled on the real system-design problems engineers get asked at top tech companies. They're the same canonical questions behind the most-studied open-source prep guides.
- Rate Limiter
- URL Shortener
- News Feed
- Chat System
- Key-Value Store
- Web Crawler
- +6 more drills
487practice questions
40skills to master
12full design drillsEverything you need. Nothing you don't.
Questions, not lectures
Every skill is a series of MCQs, trade-off decisions, and bottleneck hunts. You learn by doing, not by watching.
5 minutes a day
Bite-sized lessons that fit your commute. Build a daily streak and watch your intuition compound over weeks.
Full design drills
12 famous system design problems like the rate limiter, URL shortener, and Twitter feed, all scored like a real interview.
How it works
- 01
Pick a skill
Choose from 40 skills across 5 tiers, from latency basics to distributed consensus.
- 02
Answer, don't memorize
Work through questions that force you to reason through trade-offs, not regurgitate definitions.
- 03
Build real fluency
Earn crowns, unlock drills, and walk into your interview with genuine design intuition.
Why I built Daily Scaffold
“AI writes most of our code now, and in the process many developers are quietly losing the ability to actually reason about a system. But architecture still has to be designed by humans, not generated by a model. I built Daily Scaffold to keep that skill sharp: a Duolingo for system design that helps developers build real architectural intuition, five minutes at a time, whether you're leveling up day to day or prepping for a technical interview.”
Your next interview is waiting.
Start with 2 free tiers. No credit card, no commitment. Just better system design thinking, 5 minutes at a time.
Start for free →No credit card required · First 2 tiers free