To become one a person needs at least a bachelor's degree in computer science or a related major.(Sokanku).
The process to obtaining a major in computer science involves studying for computer science, calculus, engineering, and physics.
Employers also want people who have actual experience with computers. (Naviance).
A computer systems engineer should also have good communication skills because they will have to deal with contacts with their clients to fully understand what they want.(Sokanku)
They should also have decuctive and inductive reasoning to help them understand what problems need to be fixed or how a computer should be upgraded.