Programmers hiring ad in U-Bahn

Today there was snow lying on the ground in the morning. And as usual, S-bahn did not work, I still don't get it why it happens every year.

So I had to take U-bahn train to the office, which is much slower and more crowded. But my stop was the last one, so when I was about to exit a train I was able to make a pic of an ad:

They are hiring C++ developers, it looks. I wonder why not Javascript/Scala/Ruby, or what is the language that is now in favor or hipsters/front end devs?