If you live alone in a major city, have student loans, and don't have great healthcare benefits from your employer, you'd be lucky to save much of anything on that salary. Banking $10k is a pipe dream.
MY wife worked at a coffee shop until we had our daughter. Making around $20k / year.
In that time, we grew our net worth to $250k.
That's not a lot by some standards, but it is a hell of a lot more than most people our age have. Even people in similar income brackets as us. All it takes is living below your means.
I would be surprised if the $57k figure was accurate for people living in major cities.
I would also be surprised if the average CS graduate is competitive enough for roles in major cities. The most desirable roles are only going to be realistic for the most qualified candidates.
That is probably inflated by many grads getting jobs in NoVa, which is not exactly cheap (unless you want a hellish commute).
[1] https://www.niche.com/colleges/search/best-colleges-for-comp...