Sr. Data Engineer Staffing Architecture
The What-If Machine
We run an ads platform and want to build a simulation system that matches ad inventory (slots) against ad campaigns to answer what-if questions about fill rates, reach, and frequency. Users should be able to configure a simulation, submit it, and explore the results later. A single configuration might run up to 1,000 simulations. Design the data pipeline behind this system.
Ask the interviewer clarifying questions to understand the requirements and constraints before designing.
When you're ready, click Ready to Design to start building.
The What-If Machine
A hard Pipeline Design mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Pipeline Design
- Difficulty
- hard
- Seniority
- senior, staff
Interview Prompt
We run an ads platform and want to build a simulation system that matches ad inventory (slots) against ad campaigns to answer what-if questions about fill rates, reach, and frequency. Users should be able to configure a simulation, submit it, and explore the results later. A single configuration might run up to 1,000 simulations. Design the data pipeline behind this system.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your pipeline design solution with real code execution
- Get instant feedback and a hire/no-hire decision