I got an EB1 after switching from an H1B to an O1 since academic H1Bs are not transferable. I am good at what I do but am nothing like a Nobel prize winner. It requires fulfilling the requirements in a way the makes sense for a software engineer. For me that was working on projects at organizations of high repute; reviewing others work in open source projects; being a member of various open source organizations based on the merit of my contributions; the job I was switching paying well (more than 2-3x the prevailing wage, which most large tech companies pay); speaking at conferences; having letters of recommendation from people in my field.