There are a lot of jobs in tech, but they mostly seem to be small companies trying to pay little. So to get by at 15€ a hour, you'll probably find a lot of offers.
Accommodation is cheap, I pay 400€ for 50sqm, a friend of mine pays 550 for 70sqm with 3 rooms. That's in a central part of town. In general, between 320 - 600 you can find a pretty reasonable place for a person to live alone.
Döner costs €2.50, a chinese meal off a stall costs €3.00, a restaurant meal in some small restaurant 5€ or 6€, in some normal restaurant maybe 9€ to 12€. Beer costs €3 in most clubs and bars, cocktails €4.50 to €8.00.
Transport costs €70 a month for the train? Not so sure about this. Parking is easy on the outskirts, but the very center of town you usually need to pay in a parkhouse.
Lots of english speaking people, and it's very popular for euro-immigrants (france, england, spain, etc), so a very western europe scene, and very easy to get by on english only.
Berlin generally has a bad work climate (I've heard people say), so if I were you, I'd apply for 10-20 jobs from Warsaw, then come over, stay a week in a ferienwohnung, do all the interviews and if you find one you like, move here. Moving without a job could put you under undue pressure. Warsaw is just 4 hours by train, is it not?
I believe there are a lot of young companies in Berlin, so I don't think the Airbus style jobs are really available here.