To add to this I would like to say that if you do reach out to candidates be cognizant of the fact that you interrupted their life with this solicitation so be sure you provide all relevant information about the job, position, duties and details about your startup in the email so the candidate can make a decision if they are interested or not from your email.

If they have to go out and spend 30 minutes to an hour to google stuff about you then it's probably not going to happen.

Lastly if they don't respond to a LinkedIn message or email within a week just move on and don't keep sending follow up emails. There is a reason the candidates didn't respond because they don't want to and shouldn't have to spend even 5 minutes responding to your unsolicited email

Thanks