In Baden you have the omni-present Migros Klubschule of course www.migros.ch, then there is the TLC http://www.tlclanguage.ch/?clang=1

Migros offers swiss german courses. I'd rather learn German first and then (or parallel) some swiss german.

Never tried them, so I cannot tell you about the quality.

If you are going to work for ABB or Alstom, don't worry, they'll organize language courses for you.