Principal Manufacturing Systems Engineer (Level 4): Bachelor's degree in a STEM discipline with 8 years of experience in engineering, aviation, systems engineering, aerospace, or manufacturing/production or Master's degree in a STEM discipline with 6 of experience in engineering, aviation, systems engineering, aerospace, or manufacturing/production or PhD in a STEM discipline with 4 years of experience in engineering, aviation, systems engineering, aerospace, or manufacturing/production. Basic Qualifications for Principal Manufacturing Systems Engineer (Level 3): Bachelor's degree in a STEM discipline with 4 years of experience in engineering, aviation, systems engineering, aerospace, or manufacturing/production or Master's degree in a STEM discipline with 3 of experience in engineering, aviation, systems engineering, aerospace, or manufacturing/production or PhD in a STEM discipline with 0 years of experience.