ScaleDojo is a hands-on system design practice platform with 220+ challenges across HLD, LLD, API Design, GenAI, and distributed systems. Practice real-world architecture problems, get AI-assisted feedback, and build practical system design skills through interactive exercises. Free to start.

ScaleDojo is where engineers stop watching system design videos and start building real architectures with their own hands. 220+ interactive challenges across HLD, LLD, API design, and GenAI pipelines. Every challenge is a real system. An AI architect reviews your work and tells you exactly where it breaks. Free to start. Built for engineers who are tired of theory without practice.