Pass your next system design interview
Paste the role you are applying for. Mox builds a focused interview plan with a short diagnostic, targeted drills, realistic mock interviews, and feedback on what to fix next.
"Design a system like Twitter that can handle millions of tweets per day."
I would start by identifying the key requirements. We need to handle posting tweets, following users, and displaying timelines...
"Good start. Could you sketch the high-level system architecture?"
Focused system design practice: voice conversation, an interactive architecture board, and evidence-based feedback after each interview.
Practice the complete interview loop
Build confidence by practicing the same skills you need to explain under interview pressure.
Voice-Based Interviews
Practice with realistic voice conversations just like a real interview. Our AI asks follow-up questions based on your answers.
Interactive Diagrams
Sketch your system architecture in real-time with our built-in drawing tool. The AI can see and respond to your diagrams.
Detailed Feedback
Receive comprehensive feedback on your performance, with specific suggestions for improvement and key concepts you missed.
System Design Library
Practice system design questions covering microservices, distributed systems, caching, and more.
A Personalised Interview Plan
Follow a focused sequence of diagnostics, drills, and mock interviews built around your role and weak spots.
Success Tracking
Track your progress over time and see your improvement in different areas of system design.
How MockMe.ai Works
Our platform makes preparing for system design interviews easy and effective.
Tell Mox About the Role
Paste the job listing or describe the company, level, and interview timeline in a short conversation.
Take a 5-Minute Diagnostic
Talk through five system design dimensions so Mox can find the gaps that will matter most in a full interview.
Follow Your Interview Plan
Work through targeted drills, two role-relevant mocks, and a final readiness interview in the right order.
Plans & Pricing
Simple, affordable plans to fit your prep
Job-Specific Interview Plan
Everything needed for one serious interview push
- Role and company-specific plan
- 5-minute cross-topic diagnostic
- Focused weakness drills
- Two targeted mock interviews
- Final readiness interview
- Full question and drill library
Frequently Asked Questions
Everything you need to know about MockMe.ai
How does MockMe.ai compare to real interviews?
MockMe.ai simulates the core system design interview loop: a voice-based interviewer presents a problem, asks follow-up questions based on your answers, accepts architecture diagrams on supported desktop screens, and generates a detailed performance report.
What types of system design questions are available?
Our library includes questions on designing systems like Twitter, Netflix, Uber, distributed databases, URL shorteners, notification systems, and many more. We cover microservices, distributed systems, caching strategies, load balancing, and other critical system design topics.
What is included in the Interview Plan?
The Interview Plan includes a short diagnostic, focused drills, two targeted mock interviews, a final readiness interview, and 30 days of full access to the question and drill libraries. It is a one-time payment and does not renew.
How detailed is the feedback?
Our feedback is comprehensive and includes an overall assessment, specific strengths and weaknesses, missed concepts or considerations, and actionable suggestions for improvement. We analyze your approach to scaling, data modeling, API design, and other critical system design components.
Is there a limit to how long the interviews can be?
Most MockMe interviews take 20-30 minutes. There is no strict time limit, and you can end the interview whenever you have finished explaining your design.
Can I try MockMe.ai before paying?
Yes. New accounts include one free 5-minute diagnostic with no card required. Mox uses it to identify your weak spots before showing the personalised interview plan.
Ready to Ace Your System Design Interview?
Complete a realistic voice interview and leave with a focused, evidence-based plan for your next practice session.