Mechanical Process Engineer

Amentum is a global leader in advanced engineering and innovative solutions, supporting critical missions across defense, intelligence, energy, and civilian sectors. Our people are our competitive advantage, driven by purpose, collaboration, and a commitment to delivering excellence for our customers and communities.

We are seeking a Mechanical Process Engineer to join Amentum’s Advanced Solutions Group. Candidates may be based at either our Tullahoma, TN; Farmington Hills, MI; or Greenville, SC office.

Our Advanced Solutions Group delivers the design, construction, and operation of unique and complex research and development facilities across the nuclear, automotive, motorsports, defense, and aerospace industries. Our team has supported an impressive range of clients, including Audi, Boeing, BMW, Fiat Chrysler, Ford, Honda, General Motors, NASA, the U.S. Air Force, U.S. Navy, U.S. Department of Energy, Volkswagen, and organizations throughout North America, Europe, and Asia.

Essential Responsibilities:

• Design process and mechanical systems, including:
  • High-pressure cryogenic and pneumatic piping systems.
  • High-temperature systems, including steam systems.
  • Refrigeration, vacuum, and fuel systems.
  • Specialty HVAC systems and components.
• Size and specify piping/ducting and related components, and select compressors, pumps, fans, valves, flow measurement, and fluid conditioning equipment.
• Create engineering calculations and specifications and oversee the creation of engineering drawings.
• Gather information, interview stakeholders, conduct studies and calculations, and prepare rough layouts and sketches as required.
• Analyze work features, apply sound engineering principles and practices, and review assigned task results for completeness, accuracy, and adequate documentation.
• Under the direction of a Senior Engineer, plan, schedule, conduct, and coordinate engineering work, including selecting, adapting, or modifying techniques, procedures, and criteria.
• Provide installation support and supervision, working with suppliers, subcontractors, and other trades from the office and project sites.
• Collaborate with structural, machine design, controls and instrumentation, and aerodynamics/fluid dynamics engineers.
• Work on and lead project teams developing new designs for process systems supporting automotive and aerospace research and test facilities, taking ownership of assigned technical schedules, budgets, and quality standards.
• Support the Project Manager and Senior Engineer with ongoing design efforts, working independently and as part of a multi-disciplined team to meet project budgets and schedules.
• Develop technical reports and presentations for project management and clients.
• Participate in internal and external meetings and design reviews with team members and clients.
• Participate in proposal development and support marketing activities.
• Work in a fast-paced, deadline-driven environment while maintaining high-quality standards.

Required Qualifications:

• US citizenship is required to comply with government customer requirements and/or applicable government regulations.

• A Bachelor of Science in Mechanical, Aerospace, or a related engineering field from an ABET-accredited program.
• Minimum of 5 years of engineering experience, or 2–3 years of engineering experience with a Master of Science (MS) degree from an accredited engineering school.
• Ability to work in a multi-discipline team environment is required
• Ability to work effectively in a multi-discipline team environment.
• Demonstrated knowledge and experience with common process piping systems.
• Strong mechanical and process engineering analytical skills.
• Excellent oral and written communication, technical problem-solving, and organizational skills, with a self-motivated and team-oriented approach.
• High ethical standards and a strong commitment to self-development, teamwork, and desire to work.
• Experience managing project scope, schedules, and budgets.
• Design experience, including the layout and development of process drawings and specifications.
• Knowledge of AMSE B31.1 and B31.3 and ASME B&PV Code.
• Knowledge of thermodynamics, fluid flow – compressible and incompressible, thermal sciences, and process systems. 

Preferred Qualifications:

• PE license or FE/EIT certification.
• Prior design experience with process systems.
• Experience in the design and/or maintenance of mechanical process systems.
• Experience with AutoCAD, AutoPipe, Caesar II, Mathcad, Creo, and AFT.
• Previous DOE nuclear, DoD, NASA, or test facility experience.

Description of Work Environment:

• Work will mainly be performed in an inside-office environment.
• Field work may be required, including climbing test stands and working around machinery.
• Travel may be required to support design reviews, attend factory acceptance testing of equipment, support construction activities, and provide onsite support for startup and commissioning activities.

Compensation Details:

$100,000 - $115,000

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:

10/16/2026 - 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.