No! You mean starting out with solderboards, diodes, capacitors, and something to code the O/S from scratch? What I said before, No!

Actually... when software comes into play, one would need to re-invent the entire computer revolution all over..... starting by programming punch cards. Then eventually working up to tools that can be used to develop a modern day o/s.

Most companies like Intel, AMD, etc... have dozens, if not hundreds of engineers that specialize in specific functions, like memory management, die development, cooling, circuitry, etc... The list goes on and on.

As for software, no one person could even develop a now arcane o/s like Windows 3.0, all by themselves...