[hola_mundo]

I've done similar things in the past. My two cents:

1) Sign up for a free Crunchbase trial.

2) Search for companies that fit your criteria (Crunchbase can do precise / granular searches)

3) Add names of promising companies to a spreadsheet

4) After the list has a few dozen names, cancel Crunchbase account

5) Google the CEO or CTO of each company

6) Find their email address (try https://hunter.io/ or just Google the person in depth and you'll often find a public email)

7) Write cold email explaining: your specific skills and 1-2 sentences on why you're passionate about their industry.

8) End email with a specific ask: if you're hiring, would you have 15 minutes to chat next week?