Divide list of Millions of records into 3 usable lists (10-50k each)

I have a 3 gb file of records (10s of millions of data points) that I need to be made useful for use in my business. The list is of generic business professionals but I want to only have CEOs/founders of eCommerce, SaaS, and Digital Media companies that are small-medium. You need to be smart enough to be creative about how to find the leads necessary as the data doesn't have everything needed. For example to find eCommerce businesses, you could use [login to view URL] to determine which sites use Shopify, BigCommerce, etc. and generate a list of all C-level people who use that software. For finding all digital media businesses, you could use [login to view URL] to see which companies use Google Adsense, ClickBank, Amazon Associates, etc. For finding all SAAS businesses, you could use [login to view URL] to see which companies use PayPal, Stripe, etc. to try to find which use that. After finding list of companies, you will need to only include emails that link to C-level people or people that might be owners. You probably need a decent amount of big data or database experience. My budget is ideally $100 but I'd like cost to be less. Thank you for your consideration. -Neil