The first interview was by phone call, with high-level questions like: "What do you know about the company?" and "Did you work with such technologies?"

The second contact involved being asked to deliver a piece of my work (source code, diagram, etc.) by email.

The third interview was on-site, and the questions focused on logic and mathematics, requiring solutions on a whiteboard.

At the end, I was asked to write Java code that was "100% correct" to solve a problem. In this question, I asked if the numbers were distinct, and they said yes. I wrote the code accordingly (using a while loop). However, when I finished, they corrected the source code to replace the while loop with a for loop to support duplicated elements.

Example: if n-1 and n+1 are prime, n should be divisible by 6.

In an array of n integers, write a code that returns all couples for which the sum equals 100.