Vishal Srivastava

Learn system design by building it. Drag in components that carry real capacity, latency and cost (load balancers, caches, queues, databases, LLM services), push traffic through your design in the browser, and watch p99 latency, errors and saturation as it runs. Start free with a 151-lesson course in 7 tracks and 5 practice problems. Pro adds every graded HLD and LLD problem (70+), an open sandbox, and AI mock interviews, spoken or typed, with a scored report.