Your question is System Design With A/B Testing. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a system relevant to the role's domain, starting with number of users, data collection pipeline (batch vs real-time processing), existing output/log data, and A/B testing strategy.
Asked in the Virtual Onsite Round 5 (Science Application / Miniature System Design) stage. This is a customer-focused system architecture and research application question. Keep your answer grounded in how you would turn logs into model improvements and measure impact.