If you're on your employer's dime you work on their projects and leave your own side projects at home. Once you're off the clock you get to work on whatever you want.
As long as you don't have any obvious conflicts of interest it's pretty simple. If your side project is something that could put your employer out of business it's worth treading carefully but if there's no overlap at all it's simple enough.
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Doesn't seem like a difficult thing to balance.
If you're on your employer's dime you work on their projects and leave your own side projects at home. Once you're off the clock you get to work on whatever you want.
As long as you don't have any obvious conflicts of interest it's pretty simple. If your side project is something that could put your employer out of business it's worth treading carefully but if there's no overlap at all it's simple enough.