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System Design
AI Mock Interview

System Design Mock Interview with an AI that scores you live.

Practice system design interviews on scalability, classic design problems and data trade-offs. The AI plays a senior interviewer, pushes on edge cases, scores you live and reveals an ideal approach.

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Free to start. No credit card required.
What's Covered

Every topic a System Design interview throws at you.

Real interview territory, not generic definitions. The AI draws on these areas and pushes into the sub-topics where you are weakest.

Scalability Patterns
CAP TheoremLoad BalancingShardingCDNRate Limiting
Classic Design Problems
URL ShortenerWhatsAppNetflix CDNUber DispatchTwitter Feed
Data & Storage
SQL vs NoSQLCachingMessage QueuesEvent SourcingCQRS
Sample Questions

A taste of your System Design mock interview.

These are the kinds of scenario-based questions Joshua asks. In a live session they adapt to your answers and your target role.

1

Design a URL shortener that handles 100M new links per day. Start with the API and key generation.

2

How would you design the news feed for a Twitter-scale service? Fan-out on read or write?

3

Where does the CAP theorem actually bite you in a payment system?

4

Design a rate limiter that works across many app servers.

5

A read-heavy service is slow. Walk me through your caching strategy and its failure modes.

Who It's For

Built for these System Design roles.

Senior EngineerArchitectTech LeadStaff Engineer
How It Works

Three steps to interview-ready.

1
1
Pick your level and mode

Choose junior to principal, then text, voice, or full camera + voice simulation for your System Design interview.

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2
Answer one question at a time

Joshua, your AI interviewer, asks scenario-based questions, pushes for specifics, and adapts to your answers across four phases.

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3
Get scored and see ideal answers

Every answer is rated on accuracy, clarity, depth and confidence, with the ideal response revealed so you improve fast.

FAQ

System Design mock interview questions, answered.

Is this for software engineers or infra engineers?

Both. System design is asked of senior software, platform, and SRE candidates. The AI tailors emphasis to your target role.

Does it grade structure, not just answers?

Yes. Clarity and structured reasoning are scored explicitly, because interviewers care as much about how you think as the final design.

Can I do a longer, harder session?

Yes. The 20-question full simulation goes deep into trade-offs and scale, mirroring a senior on-site loop.

Practice other tracks

AWSAWSMicrosoft AzureMicrosoft AzureKubernetes & EKSKubernetes & EKSGoogle CloudGoogle CloudTerraform & IaCTerraform & IaCCI/CD PipelinesCI/CD Pipelines

Ready for your System Design interview?

Start a free System Design mock interview now. Get scored live and see the ideal answer to every question.

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