I applied in-person. The process took 2 months. I interviewed at P.I. Works (Istanbul) in Dec 2020
Interview
First, they sent the some technical questions that also includes an algorithm question by mail and I answered them. Then we had a 3 hours online interview with R&D manager, other senior engineers online. After this I interviewed with HR and CTO in same day.
Lastly, I interviewed with CEO.
Interview questions [1]
Question 1
Questions were from basic towards advanced. There was an IQ question in between technical questions.