Is it not legal to work for the old company as a side job?

[Dr.PI]

For a start, there is only a certain amount of time that you are allowed to work, which translates to approximately 120% maximum possible employment. Furthermore, as far as I remember you are not allowed to take a significant side work if your main employer doesn’t agree.

Overemployment possible?

Hi Does anybody have experience with “Overemployment”? (Working multiple remote jobs). I have a remote job in IT. I don’t have to put in too much hours or efforts in it but they are really satisfied with me. Now I’ve got an offer for another remote job with should also not take too much effort. I’m thinking of trying to do both at the same time. How possible would that be in Switzerland? Will the employer find out because of AHV/pensions contributions/something else? What’s the worst that c…

On the other hand, once your contract with your previous employer is finished, you have close to 0 obligations towards them. You can tell them that this is their problem now and they should have increased your salary before to prevent you from leaving.