About Barber-Nichols:  Barber-Nichols (BN) is a leading provider of custom turbomachinery for the Defense, Aerospace, Cryogenics and Energy industries. This is a unique place. Our company is made up of people that are at the top of their game. And we are working with customers who are at the top of their game. Together, we help our customers revolutionize their markets and build amazing relationships with them in the process. If you're seeking to work with an amazing team in a “get-it-done” atmosphere that supports your development, and recognizes your achievements, BN is the place for you.    Position Summary:  The Principal Engineer serves as a technical expert who ensures the proper turbomac