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Practise High Level Design interviews against an AI interviewer that behaves like the real thing: it hands you an open-ended design problem, asks for requirements and scale estimates before you draw anything, then probes the decisions you make - why that database, what happens at ten times the traffic, which component fails first, what you are trading away for consistency. Every session ends with a structured score across requirement gathering, architecture, data modelling, scalability and communication.
The question set covers the designs asked most often at Google, Amazon, Meta, Microsoft, Netflix and Uber - WhatsApp, YouTube, Uber, a URL shortener, a rate limiter, a payment system, a notification service, a distributed cache and more - across SDE-1 through senior engineer difficulty.
Practise as many system design questions as you like; repeat a question until the trade-offs come easily. For the written walkthrough of a design, start with the system design interview questions and guides, and for a four-week plan read how to prepare for a system design interview. When you want a human interviewer, book a live 1:1 system design mock interview.