My interview was conducted over the phone and consisted purely of technical questions.

The interviewer spoke softly and had a rather thick accent, which I don't hold against him, but ultimately made every one of his utterances extremely difficult to understand.

After this interview, I was explicitly told that I'd be contacted with my results within three weeks. However, Visa neglected to ever contact me.

On top of this, Visa seems to have no consistency in how they conduct their interviews. I say this because I personally know people who had Visa phone interviews around the same time that I did, but their experiences were drastically easier and favored behavioral questions over technical ones.

Describe Euclid's Algorithm and provide some of its real-world applications.

What is the difference between a hash function and a secure hash function, and how would you go about altering a hash function to make it secure?