6k is even above IG Metall pay schemes, you will never get 6k in Germany 3years after graduation. I call bullshit. It may be possible if you have a PhD or for some not engineering related reason are rising ranks very fast.
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.
That's absurd I have multiple german friends >70k euro + all the other benefits. All stem yes but only 1 is a phd. Frankfurt, Berlin, and Stuttgart too so not just 1 isolated city.
6k base means 80k all-in/year which is the highest union level (e.g. IG metall EG17 in Baden-Wurttemberg). You can reach this level only on a specialist level (PhD) position, with very senior >> 3 years experience or as a manager.
It actually is a igm contract. Base salary + "freiwillige Leistungszulage". Also I haven't had significantly less in my last job (in the last position there). Also a lot of friends (engineers/Maschinenbau mostly) earn (at least) the same. All at around 80k (with a 40h work week) all in my age (i.e. around 3-5 years out of university). And yes, bigger companies.