Welcome to your interview.
The question is on your right: Complex REST API with JSON. 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.
Create REST API endpoints for a JSON file: save a given JSON object using POST, retrieve the top K objects from the database based on criteria with pagination and sorting, and parse data from the file and store it.