And for $15 in Berlin you would expect a main course, glass of wine, and espresso in a decent sit-down place, tips included.

$15 CA is €9.50...The meal you describe would still cost more than that, maybe $20 CA & that would be the cheaper end of the spectrum (€7 Mittagsmenü, €3 wine, €1.5 espresso + 10% tip, then convert € to $CA).

If you're in central business locations in Mitte or Charlottenburg it would be more than that. That said you have very cheap options for Turkish, Arab or Vietnamese food in other districts like Neukölln. One of the best benefits I had when self-employed was the cheap & decent "ethnic" food options I had near the coworking space I chose in Neukölln vs having to go to the office in an expensive part of Mitte.

Right, I was thinking USD so ~13€. For that you have a nice main, wine, and coffee in half the ethnic places of Berlin. Not in Mitte as you said though.

As a side note, I don't know anyone actually tipping 10%. At this price range usually it's rounded to next full euro.

I try to tip at least 10-15% and in cash as the waiters for sure earn less than I do & honestly the extra Euro or 2 make 0 difference to a well compensated software developer.