It is an online programming task in C++ 14. However, the details are not allowed to be published. I have made many similar programming task before in other job applications. I succeed with some and failed in the other. However, this one was really interesting. Actually, the most interesting one at all by far. Although I did not pass, I was happy to test my abilities in such very elegant way. I would definitely consider re-applying again when I feel confident about my abilities to be part of this team. An environment where the first screening test that looks like the one I did is an every engineer dream! It was my first time applying for a Germany based company. I understand now why "Made in Germany" make any product much brighter!