Hi @attika59,
no, not in the sense of having more than 100% employment.
I cannot say anything about contractors.
For salaried employees, I don’t see any issue as long as your total official workload doesn’t exceed the maximum number of work hours. That is currently 45 or 50 hours, depending on the type of work. s. State Secretariat of Economic Affairs
So a 50% contract here for 20 hours and another 50% there for another 22 hours would not raise issues and also alleviate concerns of the employers that your side hustle interferes with your main job.
You may be able to tweak that number, but having two contracts adding up to nominally 60 hours a week may raise eyebrows.
Again, for salaried employees, there are rules to ensure that they have rest periods:
S. also fact sheet on multiple employers.
(Sorry, both sources only available in German)
See also my previous post (esp. item 2):
So first, read your contract.
What’s the worst that could happen if they find out?
They can fire you. Well, realistically, only if you’re in clear violation of your contract, e. g. you work for a competitor, violate confidentiality agreements or have a strict “no side hustle rule (without prior permission)” rule.
I strongly suggest to get written permission from each employer, allowing side hustles in a broad manner, and to anticipate a discussion about any formal “overwork”. Usually, employers can refuse permission beforehand only with very good reasons.
It’s more about communication than the official rules. After all, you wan to stay on good terms with both employers.
Cheers,
J.