I applied online and had two interviews. The first was with an HR person, and it was not technical at all. The second was with a developer on the team I applied to. I did not continue to the next interview as I failed the second one. Both interviews were on Skype and included a 20-minute live coding session on CoderPad.

1. What is the maximum value of an unsigned integer in a 32-bit system?

2. Which is better for a sorted array: a Binary Search Tree or a linked list?

3. How many bytes are there in 64 bits?

4. What is the time complexity of a Binary Search Tree on a sorted array?

5. What is the time complexity of a linked list in the worst-case scenario?

6. What is the difference between a process and threads?

7. What does ARC stand for?

8. What is a View Controller doing?

9. What is the difference between a protocol and a delegate in Objective-C?

10. What do you use to round the corners of a UIView?

11. What is a singleton class, and how do you create one?

12. What is a category in Objective-C? Can you add a stored property to a category?

13. What are Blocks in Objective-C, and how do they work?

14. During a live coding session on CoderPad, the coding question was not practical. It used C syntax, while I know Objective-C. It was simple but very difficult to understand and solve.