I know a few people across different CS disciplines in Germany and none of them has IG (i.e. union) based wages. €72k a year is realistic with 3y experience in southern Germany or one of the big cities. You can start at 50k if you look around a bit after Uni, no PhD needed. The step to 62k is then easily done by changing companies once after 2/3 years. That sector has seen a lot of wage inflation in recent years.