I think the next step after reading that material is to just get experience in it. Consider applying to some software companies that are massive in scale. AWS,

I think the next step after reading that material is to just get experience in it. Consider applying to some software companies that are massive in scale. AWS, GCloud, Azure, Netflix. People whose systems need good design. Once you get into a place like that, go after positions on teams that own huge systems, and get mentorship.