This shouldn't be a problem as long as you're willing to: - not sign, in the first place, any NDA or confidentiality agreement that would extend the employer's

This shouldn't be a problem as long as you're willing to: - not sign, in the first place, any NDA or confidentiality agreement that would extend the employer's right to anything that 1) you work on your own time and 2) isn't directly related to the current field of work you're doing for the employer - in general, steer away from employers that spend time worrying about their employees leaking out their precious knowhow - to enforce the above choices should you find yourself in such a situation; in other words, walk away real soon now