What skills do you need to be an airplane engineer at Boeing?

Answer 1

You need to know how to design airplanes. To learn this you get a degree in aerospace engineering.

And when you DO get this degree and go to work for Boeing, you will quickly learn that airplanes, especially transport-category aircraft like Boeing makes, are so complex there's no way one person could design an entire airplane. They specialize--there's a team of engineers who do nothing but design the various ports and doors the ground crew uses when they work on a plane. If the ground crew can service an airplane fifteen minutes faster, that gives the passenger service agents fifteen more minutes to load the plane while maintaining the same schedule which makes the passengers happier, or it lets the plane leave fifteen minutes quicker which lets the airline make more money.