Mechanical HVAC Engineer 3

Amentum delivers world-class solutions through the expertise, dedication, and collaboration of our people. We partner with our customers to solve complex challenges and are committed to fostering a workplace where employees can grow, succeed, and make a difference. We are currently seeking a Mechanical Engineer 3 to support our Denver office. Purpose/Scope Description: Perform a variety of engineering assignments in planning and overseeing research, development, design, manufacture, test, installation, operation, and maintenance of diverse electronic/mechanical equipment and systems and generally as a member of a design, analysis or review team on more complex assignments or as a lead on less complex assignments. Essential Responsibilities:

1. Perform a range of design development, analysis or review tasks under minimal supervision.
2. Act as a lead on less complex tasks and responsible for a portion of a design or section of an analysis or design review.
3. Generate complete design specifications of more complex projects.
4. Coordinate and work closely with other engineering, logistics, finance, and program management disciplines to define system specifications and requirements.
5. Establish and maintain a filing system or databases as needed for tracking project status.
6. Develop, maintain and produce technical documentation and system/subsystem specifications.
7. Direct interface and liaison with customers at all levels from quotation to final design and test activities, design reviews and technical working group meetings to comply with requirements and specifications.
8. Conduct site visits, experimental investigations and analyze engineering problems, propose solutions and alternatives, and provide recommendations.
9. Verify and comply with engineering documentation standards and test procedures.
10. Support development of technical proposal and provide comments on the technical content and level of effort of the proposed scope of work.

Required Qualifications: Bachelors degree in Engineering, or related scientific field. 5 years of job-related experience or equivalent. Good communications and analytical skills Working knowledge of computer systems and integrated software application programs. Position may require travel. Position may require the ability to pass and maintain a Security Clearance. US Citizen only. Dual Citizens are not allowed. Preferred Qualifications: Experience in HVAC systems design and associated engineering calculations (e.g. Air-handling systems, HEPA filtered exhaust systems, duct systems, heating and chilled water hydronic piping systems, steam and condensate piping systems, and HVAC system controls). Experience sizing and selecting HVAC equipment (e.g. air-handling units, fans/blowers, pumps, cooling towers, chillers, boilers, coils, HEPA filtration systems, dampers, valves, and controls). Proficient in editing and writing HVAC construction and equipment specifications. Experience using HVAC computer load and design programs such as Trane Trace software. Working knowledge of ASHRAE standards. Working knowledge of DOE codes. Familiar with SMACNA standards. Familiar with NFPA standards. Familiar with AutoCAD is preferred Revit BIM experience is preferred. Compensation & Benefits: HIRING SALARY RANGE:$120K – $140K Annually (Salary to be determined by the education, experience, knowledge, skills, and abilities of the applicant internal equity, and alignment with market data.) Compensation Details: $120,000 – $140,000 The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws. Benefits Overview: Our health and welfare benefits are designed to support you and your priorities. Offerings include: Health, dental, and vision insurance Paid time off and holidays Retirement benefits (including 401(k) matching) Educational reimbursement Parental leave Employee stock purchase plan Tax-saving options Disability and life insurance Pet insurance Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits. Original Posting: 07/24/2026 - Until Filled Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs. Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters. #J-18808-Ljbffr Amentum