Due to the COVID-19 pandemic, there were 4-5 online interviews. Almost each interview contained 2-3 questions of two main types:

• Algorithmic problems on general topics (binary search, sorting, two pointers)
• Java-specific questions (iterators, concurrency)

All code for problems had to be written in an online editor without compilation or execution, which might have been a challenge for some.

Concurrency:

• Concurrent singleton initialization
• Implement a simple concurrent stack