Jobs at small San Diego companies nobody posts about, home health aide here

Two small San Diego employers told me they are hiring but have not posted yet. I am in San Diego, in case local advice matters. They like a brief email with a résumé. Should I visit in person?

A short email with two sentences about what you can do and your résumé attached worked for me. I followed up after a week.

Keep a list of who you contacted and when. It makes follow-ups easy.