I received multiple calls from them regarding four different positions, each with a different recruiter. I completed a couple of tests, which were very easy, covering Python, data structures, and an English assessment.

After that, they informed me that an interview would be scheduled "soon" and advised me to be patient.

Well, two months later, nothing had happened. I then received four emails (one for each position) from the recruiters informing me of my rejection.

How do you do parallel matrix-matrix multiplication?

Explain your experience working with Python.

How do you choose a sorting algorithm?