The interview was a one-hour tech screen.

The first 15 minutes consisted of a discussion of my past experience. Questions included:

• "Tell me about some of the models you've worked with? What was the impact? What were the features? What were you experimenting with?"
• "Tell me about a time you were 50% of the way into a project and decided to pivot."

We then spent approximately 40 minutes on a coding question. The task was to implement a rate limiter capable of enforcing a maximum number of requests per second for each source (e.g., IP address).

The last 5 minutes were for me to ask questions.

Implement a rate limiter capable of enforcing a maximum number of requests per second for each source (e.g., IP address).

Assume that your rate limiter receives events of the form (source, timestamp), where each event represents a request and must make a decision to either allow or throttle the request.