Which engineers are required to make laptops?

There is a basic requirement of 4 kind of engineers and they're:

• Electronics and Electrical Engineer, for completely making the motherboard of the phone/laptop.
• Electronics and Communication Engineer, to work closely with the Electrical Engineers and then add in their expertise to make the device compatible for Networking and Communicating purposes in the hardware area.
• Computer Science Engineer works with the EE/EC Engineers to write the Hardware code for BIOS of the system being made/developed.
• Design Engineer/Designer to make the outer body of the system being developed. The Design area is several different engineers combined, like they can be Mechanical Engineers or just Designers.