One option that may help is to use LinkedIn to find the key decision makers, figure out their email address (almost all companies have a fixed naming convention) and then put them in a Facebook Custom Audience group. Then just keep targeting them so at least they are aware of who you are and what you're doing.
The key people to target are lower level engineers, program managers as well as the VPs in charge of their respective cloud platforms.
This is pretty creative, but doesn't this require the targets to have Facebook accounts associated with their professional email addresses from Linkedin?
The key people to target are lower level engineers, program managers as well as the VPs in charge of their respective cloud platforms.