About Crack System Design
Crack System Design is a free, open educational site for software engineers preparing for technical interviews — from FAANG system design rounds to low-level design (OOD) and Forward Deployed Engineer (FDE) loops at AI companies.
Mission
Interview prep should not be locked behind expensive courses. This site publishes structured, practitioner-level guides in the browser with progress tracking, search, and practice modes — no signup required.
Author
Vivek Panchal builds and maintains Crack System Design. Content is used by 10,000+ engineers worldwide for interview preparation.
Free resources
- System Design (HLD + LLD theory) — 130+ topics: scalability, CAP theorem, databases, microservices, Kafka, Redis, and case studies (WhatsApp, Netflix, Uber, URL shortener).
- Crack LLD — 37 low-level design problems in JavaScript with UML, design patterns, and full source code.
- FDE Career Guide 2026 — Forward Deployed Engineer role, salary, RAG stack, fit quiz, and 90-day transition plan.
- FDE Interview Sheet — 300 questions with solutions, Mock Interview Lab, and practice mode.
How to cite
Vivek Panchal. Crack System Design (2026). https://cracksystemdesign.com/