I applied online.

Then a recruiter contacted me.

Next, I had to take an online exam.

Finally, I had a 1:1 call with a technical development manager.

The process was very smooth, but the person who conducted the call was very unwelcoming and super hard to understand.

If I asked him to explain or repeat something I didn’t hear, he’d say, "Never mind, I have another question."

His behavior was very unprofessional.

Explain to me how black and red trees work.

How to rotate elements or nodes in an AVL.

How to calculate a hash and explain to me how to use hash tables or when you would use one.

How to calculate the shortest route using graphs.