Interactive reasoning lab
Debug The
System
Test your systems thinking through backend, scale, fintech, data, and mathematical reasoning challenges.
6 categories · 21 challenges
Every system starts as a constraint problem.
Select a category to begin, or start in mixed mode to draw from all challenge types.
About the lab
Each challenge is a real failure mode drawn from backend engineering, financial systems, and distributed infrastructure. No trivia. No hypotheticals.
Explore the systems
These are the reasoning patterns behind the actual systems I have designed and built. View case studies →