The technical interview consisted of two, one-hour long interviews out of a total of five. These interviews tested concurrency and algorithms. Interviewers encouraged pseudocode but would give poor feedback if it was actually used, and did not consider problems that have solutions within a language's standard libraries.

Construct a callback registration system that, when fired, executes all registered callbacks, and then any callback registered after fire() was called.

Set values in a level within a binary tree and rebalance the tree optimally.