For a GmbH you need at least 2 people, one of whom must be resident (C permit or Swiss I think). It is possible for one partner to have power of attorney for the other, so in effect run the company alone.

If your company will sell labour (mine does) it will need a 'Bewilligung zur Personalverleih' (labour secondment permit) that will need a deposit or bank guarantee for CHF 50k (for low incomes) or CHF 100k. It is worth checking up on this.

My bookkeeper handles lots of small foreign IT contracting companies and speaks OK English. I'll put you in touch if you like.