Jobs at small Minneapolis companies nobody posts about - first time posting

I asked around at a community meeting and got three leads. I have read a lot of threads here and could not find my exact situation. They like a brief email with a résumé. What do you write in a cold email?

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.