Welcome to your interview.
The question is on your right: Cron-Based Distributed Task Scheduler. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Design a distributed Task Scheduler that can accept new tasks from users, store them durably, and schedule and execute them periodically based on a cron expression.