Now I'm going to work as a builder in an electric power construction unit to do electric power construction.

Big companies may be good. If it is streamlined, you may not be able to grow rapidly. Small companies can't learn anything, but their strength is limited, their projects are small and their horizons are small. Of course, small companies need to get started quickly, and maybe pressure forces you to grow. Really want to learn, first go to construction for a while, then go to design. 1- 10kV medium and low voltage power distribution, rural power distribution network has low technical content and is complex, so I hope you will consider it carefully.