Two Wallets
A medium Data Modeling mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Data Modeling
- Difficulty
- medium
- Seniority
- L5
Interview Prompt
We run an online education marketplace with two user types: students paying for access, and instructors paying for listing and promotion features. Both can subscribe to different plan tiers using multiple saved payment methods. Design the data model, then write the SQL for month-over-month subscription growth.
Summary
Two user types. Multiple payment methods. One messy billing table.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your data modeling solution with real code execution
- Get instant feedback and a hire/no-hire decision