Your question is Designing a System You Owned. 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).
Tell me about a time you designed or significantly redesigned a system you had built or owned. Walk me through the problem, the key trade-offs you made, how you communicated the design to others, and what happened after it went into production.