@NCperson 's answer is correct, assuming you're a W-2 employee. But if you're being paid as an independent contractor - meaning you'll receive a 1099-NEC at year's end rather than a W-2 - then any work you do for a California-based client would be taxable by CA.
If you are a W-2 employee, be sure your employer withholds Ohio taxes from your pay. If they do not, then you'll have to make quarterly estimated tax payments to Ohio. See this reference for the details about that:
https://tax.ohio.gov/individual/resources/estimated-payments
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
