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SensAI
Early Access

Hi, I'm SensAI

I'm the AI that watches you struggle with DP and doesn't judge. I read your code, look at your whiteboard, and tell you exactly what an interviewer would say. Except I'm available at 2 AM and I don't charge by the hour.

390Problems I can help with
35System designs I've reviewed
24/7Available (I don't sleep)

100% free. No payment. No credit card. Just click and you're in.


Things Iโ€™m actually good at

I review your code

You submit, I tell you the complexity, what you nailed, and what would make an interviewer raise an eyebrow. Faster than waiting for a friend to "review it later."

I nudge, not spoil

Stuck for 15 minutes? I see your code and give you one sentence. Not the answer. Just the right push. "Think about what happens when the window shrinks."

I read your whiteboard

Draw boxes and arrows. Ask me "What's missing?" I'll tell you the load balancer is pointless without a cache and your DB will melt at 100K QPS.

I answer follow-ups

"Why Kafka here?" "What if Redis goes down?" "Is this O(n) or O(n log n)?" I have the full context of whatever you're reading. Ask anything.

I stress-test your designs

Build an architecture in the simulator. I'll tell you where it breaks, what's over-engineered, and what would get you a "No Hire" verdict.

I draw diagrams

When I explain something, I render actual flowcharts. Not "Client -> LB -> DB" in text. Real diagrams with boxes and arrows you can screenshot for your notes.


What Iโ€™m learning next

Mock Interviews

I pick a problem. I ask you to scope it. I push back when you hand-wave. I score you. 45 minutes, no human needed. Your friends said they'd practice with you. I actually will.

Your Personal Study Plan

Based on what you've solved, what you keep getting wrong, and when your interview is. Not a generic "do 150 problems" list. A plan that changes as you change.


Get Early Access

All features above are currently unlocked for everyone.

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Shape what we build next

Every piece of feedback is read by the team and directly influences our roadmap.

What type of feedback?

Install SystemCraft

Add to your home screen for instant access, offline reading, and a distraction-free experience.

Offline reading Faster loads No browser tabs App-like feel

Unlock AI Features

One click to activate - no payment, no credit card. Just sign in and you're in.

AI code review and hints
SensAI chat assistant
AI mock interviews
Whiteboard analysis
100% free during early access