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AI mock interviews

Sit a system design interview, right now

Pick a question or a company. An AI interviewer states the problem, asks you one thing at a time, probes what you say and what you draw, keeps the 45 minutes moving, and ends with a scored debrief. It has the reference design in front of it; you do not.

Anyone can start a round and hear the interviewer open it; answering is part of Pro. See an example round and its debrief →

By company

The same questions, run in the style that company’s round is reported to take, and weighed the way it is reported to weigh things.

AnthropicGoogleMetaAmazonOpenAIMicrosoftUberDoorDashNetflixStripeNVIDIALinkedInAtlassianAirbnbDatadogLyftApplePinterestDropboxSnapShopifyDiscordRobinhoodTikTokBloombergBooking.comCoinbaseInstacartAdobePayPalSalesforceDatabricksSnowflakeHubSpotConfluentGrabNotionSlackSpotifyFigma

By question

Timed, or untimed with an AI Mentor beside you.

URL ShortenerSlackPayment SystemNews FeedYouTubeGoogle MapsMatchmaking SystemUberNotification SystemGoogle DocsLLM Inference ServiceChatGPTDistributed CacheWeb CrawlerRate LimiterDropboxTicketmasterSearch AutocompleteAd Click AggregatorDistributed Job SchedulerStock ExchangeProject-to-Contractor Matching SystemInstagramWhatsAppNetflixYelpReal-Time LeaderboardDistributed Key-Value StoreUnique ID GeneratorLeetCodeAirbnbDistributed Message QueueMetrics and Monitoring SystemTinderRedditDoorDashAWS Step FunctionsApache AirflowZapierOnline AuctionLive CommentsTop-K Heavy Hitters ServiceZoomGoogle SearchSpotifyGmailAmazonLarge File Distribution SystemRecommendation SystemDistributed Lock ServiceObject Storage ServiceGoogle CalendarCode Deployment SystemDistributed Logging SystemTwitchPrice TrackerStravaPost SearchFigmaLoad BalancerRAG SystemCDNAPI GatewaySocial GraphAd Serving SystemGitHubVenmoMultiplayer Game BackendTikTokGoogle NewsA/B Testing PlatformGitHub CopilotNearby FriendsFraud Detection SystemPastebinWebhook Delivery SystemPinterestVector DatabaseContent Moderation SystemRobinhoodFlight Booking SystemContainer OrchestratorDiscord

Questions people ask about mock interviews

What is a system design mock interview?

A practice round that runs like the real thing: an interviewer states an open-ended design problem, asks one thing at a time, and probes your requirements, numbers, design and deep dives for about 45 minutes. Its value is in saying the answer out loud under a clock, with someone following up on the weak part, which reading cannot give you.

How does an AI system design mock interview work?

An AI interviewer opens one of 83 questions, asks one thing at a time and probes what you say. You answer in the chat and draw your design on a shared whiteboard, which it reads with every answer. It keeps a 45-minute clock in a timed round, or follows you as deep as you want untimed, and ends with a debrief scored out of 100 with notes on each stage.

Can I do a system design mock interview in the style of a specific company?

Yes. Company rounds use a question reported at that company and run in the style its round is reported to take, weighing what it is reported to weigh: Anthropic, Google, Meta, Amazon, OpenAI, Microsoft and others. The descriptions come from public interview guides and candidate accounts, and from a company’s own interview guidance where it publishes any; none is endorsed by the companies.

Is the AI mock interview free?

Anyone can start a round and hear the interviewer open it, with no account. Answering the interviewer, the scored debrief and the company-style rounds are part of Pro. The walkthroughs, where you watch a strong candidate answer the same questions turn by turn, are free with a Google sign-in.

Should I watch a walkthrough before a mock interview?

For a new question, yes: watch how a strong candidate paces the hour and makes each call first, then sit the same question as a mock a few days later without looking. The debrief then shows what you actually kept, stage by stage, with links back to the same stage of the walkthrough.