Mechanical / HVAC Designer Senior

As a Mechanical / HVAC Designer in the Amentum Nuclear Projects and Consulting business unit you will work with Senior level designers to create HVAC equipment, ductwork and piping 3D models. Additional responsibilities will include coordination with other disciplines working in BIM models, working with mechanical engineers, and designers/engineers in other disciplines to deliver a fully coordinated and collaborated project. Designer will be responsible for creating the design deliverables such as orthographic and isometric drawings.  Additionally, designers will assist in interference detection and resolution as well as ensuring proper integration with other tools.

Qualifications - External

• High School Diploma/GED

• Experience using BIM tools for Plant such as: SmartPlant 3D, Revit, BIM/3D software, etc…

• Proficiency using design software such as: AutoCAD, and MicroStation

• Industrial HVAC ductwork and piping layout design experience

• General understanding of Building Mechanical Systems: HVAC/Piping/Plumbing

Preferred Qualifications:

• In addition to the Basic Qualifications the ideal candidate might also have:

• 5 or more years of experience preferred.

• Trade School or Associates Degree

• Strong communication skills.

• Exhibit integrity and the highest quality in all activities

• Self-motivated, team-focused professional

• Self-starter with the ability to learn new design software

• Previous nuclear and industrial design experience

• Attention to detail

Essential Functions 

Work Environment  
Office environment. (95%)  

Telework is not an option for this role, all work performed from secure office environment.  

May be exposed to areas of high noise levels, hazardous propellants, explosives, chemicals and industrial facilities.  
 
Physical Requirements:  
Appropriate PPE and training will be provided for all conditions. 
Must be able to move and sit for extended periods (100%) as well as and lift up to 35 lbs (25%). Vision correctable to 20/20. Candidate must have the ability to read and use SmartPlant design software unassisted.   
Equipment and Machines: 
Standard office equipment - PC, telephone, fax, copier, job related software (SmartPlant design) and other related equipment (90%) 
Attendance: 
Regular attendance mandatory (100%) 
Overtime/work outside normal schedule required (as needed) 

Travel required (<10%) 
 
OTHER ESSENTIAL FUNCTIONS 
U.S. Citizenship required. No dual citizens. Valid driver's license is required. Must be able to work in a team atmosphere. Must put forward a professional behavior that enhances productivity and promotes teamwork and cooperation. Must be familiar with and comfortable working in a team environment.  Appropriate grooming and dress code acceptable for a customer environment is necessary. Must be able to obtain and maintain a security clearance as required. Must take and pass a pre-employment drug and background check.

Compensation Details:

$50 - $80

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:

09/10/2026 - 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.