Basic Qualifications for Senior Principal Facilities Engineer (Level 4): Must have a Bachelor of Science degree in a STEM (Science, Technology, Engineering or Mathematics) discipline with 8 years of relevant experience; OR Master of Science degree in a STEM (Science, Technology, Engineering or Mathematics) discipline with 6 years of relevant experience; OR PhD in a STEM (Science, Technology, Engineering or Mathematics) discipline with 4 years of relevant experience. Basic Qualifications for Principal Facilities Engineer (Level 3): Must have a Bachelor of Science degree in a STEM (Science, Technology, Engineering or Mathematics) discipline with 5 years of relevant experience; OR Master of Science degree in a STEM (Science, Technology, Engineering or Mathematics) discipline with 3 years of relevant experience; OR PhD in a STEM (Science, Technology, Engineering or Mathematics) discipline with 1 years of relevant experience.