I guess it depends on what "developer friendly" means. If it means 'easiest method for a developer to contact me' that's email. It's ubiquitous. Everyone has at

I guess it depends on what "developer friendly" means. If it means 'easiest method for a developer to contact me' that's email. It's ubiquitous. Everyone has at least one. It's easy. If it means 'easiest method for only developers to contact me' that would probably be some documented REST API. Either way, I agree the answer isn't Linkedin.