Step 1 of 4
Which company is your dream destination?
We'll tailor your study plan with company-specific question patterns and rubrics.
Step 2 of 4
What level are you targeting?
This determines the depth and complexity of systems we'll focus on.
Step 3 of 4
When is your interview?
Be honest — we'll pace your plan to match your runway.
Step 4 of 4
Quick skill check
3 questions to find where you shine and where to focus. No judgment.
How do you handle 10× traffic on your app overnight?
A Upgrade the server CPU
B Add a load balancer + horizontal scaling
C Enable CDN caching for static assets only
D Not sure — this is new to me
A read-heavy leaderboard needs millisecond latency for millions of users. Pick your storage?
A PostgreSQL with an index
B Redis Sorted Sets
C MongoDB with aggregation
D Not sure how caches differ from databases
Your service returns HTTP 500 errors at peak. First thing you check?
A Application logs and error traces
B Database connection pool exhaustion
C Restart the server
D Not sure how to start debugging this