Clarify requirements
Turn an ambiguous prompt into functional requirements, constraints, and a clear interview plan.
Live AI mock interviews available
Practice System Design like a real interview
Lead a full-length conversation from requirements through deep dives. EngMock's AI interviewer listens to your reasoning, follows your architecture on the whiteboard, and evaluates the evidence you actually produced.
The current live experience
Practice the complete System Design loop
This is EngMock's most advanced interview simulation today. Sessions combine real-time voice, a shared architecture canvas, time pressure, structured follow-ups, and a detailed post-interview report.
51 original live mock scenarios
Cover classic distributed systems, AI infrastructure, agent systems, security, reliability, and modern platform architecture.
Estimate the workload
Quantify traffic, storage, latency, availability, and the assumptions driving your architecture.
Design the system
Define APIs, data models, components, and data flows on an interactive whiteboard.
Defend trade-offs
Respond to follow-ups on scaling, consistency, reliability, bottlenecks, and failure recovery.
Two complementary libraries
Simulate, review, and broaden your coverage
Live mock scenarios
Use the curated scenario library for timed, interactive interviews with voice, whiteboard awareness, playback, and evidence-based feedback.
Explore all live scenarios →Candidate-reported question bank
Browse paraphrased System Design prompts reported by candidates. Public previews are available now; full question access is planned for EngMock Pro at $9/month.
Browse System Design reports →Start with the live experience EngMock offers today
Choose a System Design scenario, explain your decisions aloud, draw the architecture, and review exactly where your interview signal was strong or incomplete.
Start a System Design mock