Your resume must also demonstrate at least one year of specialized experience at or equivalent to the GS-07 grade level or pay band in the Federal service or equivalent experience in the private or public sector. Specialized experience must demonstrate the following: Applying mechanical/HVAC engineering principles, design criteria, building codes, and safety regulations to assigned projects; examining HVAC systems to identify repairs; AND monitoring contracts to advise customers on scope of work. Examples of qualifying specialized experience include technical work in: drafting, surveying construction estimating, physical science, mathematics, aerospace, architecture, chemicals, electrical or mechanical systems, mining, petroleum, or nuclear systems. Experience in a trade or craft may be credited as specialized experience when the work provided intensive knowledge of engineering principles, techniques, methods, and precedents. Examples are trade positions with substantial developmental, test, or design responsibilities such as: Planner and estimator who analyzed designs for production purposes. Instrument maker or model maker who performed design or development work on devices fabricated. Engineering technicians may be certified by the National Institute for Certification in Engineering Technologies, an organization sponsored by the National Society of Professional Engineers. Certification by the Institute will be helpful as a measure of the technician's quality of experience. Additional qualification information can be found from the following Office of Personnel Management website: https://www.opm.gov/policy-data-oversight/classification-qualifications/general-schedule-qualification-standards/0800/engineering-technical-series-0802/ Experience refers to paid and unpaid experience, including volunteer work done through National Service programs (e.g., professional, philanthropic, religious, spiritual, community, student, social). Volunteer work helps build critical competencies, knowledge, and skills and can provide valuable training and experience that translates directly to paid employment.