SysRound

SysRound is an AI mock interview platform for system design interviews. It is for software engineers who prepare for onsite rounds at large tech companies, from mid-level to staff.

Reading about system design is not the same as doing the round. In a real interview, you must think out loud, defend your choices, estimate numbers and draw a design while someone pushes back. SysRound lets you practice exactly that.

You talk with Alex, an AI interviewer, for 45 or 60 minutes. Alex asks one question at a time and keeps you talking. Alex does not give you the answer. You can both talk at the same time, so you can stop Alex and think out loud, as on a real call. Alex keeps to the phases of an onsite round: requirements, estimation, API and data model, high-level design, deep dives and wrap-up. Alex watches the clock and tells you when to move on.

You draw on a shared whiteboard. Alex reads your diagram while you work, writes down the numbers you agree on and adds comments to the parts it wants to ask about. You can also type notes and short code. If you prefer, you can do a round by text instead of voice.

When you finish, you get a scorecard on seven skills: problem framing, navigation and ownership, high-level architecture, technical depth, trade-offs, scale and reliability, and communication. Each score quotes your own words or drawings, so you can check it. The grader scores every round three times and uses the middle result. You also get the key moments of the round, a model answer that starts from your own notes, a replay of the whiteboard and a practice plan for your weakest skills.

SysRound has about 270 questions, each with a private brief: the scope, the numbers, the deep dives and the bar for mid, senior and staff levels. They range from a URL shortener and a rate limiter to news feeds, ride hailing and machine learning system design. The site also has free guides to more than 130 system design concepts, with no sign-in.
Your audio is not stored. Only the transcript, the whiteboard and your notes are kept, so you can review them.