Automated AI video call where they first ask you several technical questions about a language you've used. At the end, they ask how you would implement a solution for problems they present.

Why do we need to pin objects when dealing with native code in C#? What problems can occur if we don't handle pinning correctly?

Could you design a URL shortener service that handles 10,000 new URLs per day and needs to store them for at least 5 years? The service should generate unique short URLs under 10 characters and resolve them in under 100 milliseconds. Consider how you would handle URL collisions and what happens when URLs expire.

How would you handle regional performance if your URL shortener service needed to serve users across different continents? What architecture changes would you consider?