Hi, thanks for submitting your question today. My name is XXXXX XXXXX I’m happy to assist you with your question today.
Assuming you a) don't steal their ideas, b) spend your on-the-job hours devoting your time exclusively to them/their projects, then I don't foresee a problem. You'll also have to closely review any proposed contracts
/restrictions they place on you during and post employment. Some contracts require you to assign any invention (not just ideas you come up with on their time but your own time as well) to the employer. California does not enforce non-compete agreements post-employment, but you'll want to be clear that you are able to use your (personal/ non-employer) ideas after you quit. Further, be sure not to even use any of the employer's materials, facilities etc. when developing ideas for your business
venture; don't let there be a question of whether you did the work on your time with your resources. You may even want to keep a log of what you are doing on your own projects and when, which is super anal, but may protect you in case a dispute ever arises.
I believe this answers your question. However, if you need clarification or have follow-up questions regarding this matter, I will be happy to continue our conversation – simply reply to this answer. If you are otherwise satisfied with my response, please leave a positive rating as it is the only way I am able to get credit for my answers. Thank you, XXXXX XXXXX wish you all the best with this matter.