Senior Mechanical Engineer

Amentum; Aiken (SC); On-site; USD 110,000 - 160,000; Full time

Benefits offered by this job

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

Job summary

Amentum in Aiken, SC is seeking a Senior Mechanical Engineer to provide engineering support for U.S. Department of Energy projects at the Savannah River Site. This role involves designing HVAC, plumbing, and piping systems, leading engineering teams and ensuring compliance with established engineering procedures.

The ideal candidate has a B.S. in Mechanical Engineering and 15 years of relevant experience. The compensation range is $110,000 – $160,000, and benefits include health insurance, retirement, and educational reimbursement.

Qualifications

• 15 years of industrial/government design of Mechanical, HVAC, Plumbing, and related mechanical building systems.
• Demonstrated experience delivering projects from concept through detailed design completion.
• Thorough knowledge of applicable codes & standards (IMC, NFPA, ASHRAE, ASME, etc).

Responsibilities

• Lead and oversee the design of HVAC, plumbing, and piping systems.
• Develop, review, approve, and check engineering calculations, layouts, specifications, and drawings.
• Coordinate mechanical designs with structural, electrical, architectural, and process disciplines.

Skills

Mechanical Engineering

HVAC design

Plumbing systems design

Piping systems design

Project management

Education

B.S. in Mechanical Engineering

Tools

Computer-aided design software

Job description

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.

SENIOR MECHANICAL ENGINEER – AIKEN, SC office at the Savannah River Site (SRS). The Engineer will provide engineering support for U.S. Department of Energy (DOE) facilities and projects in Design Services. The Engineer must have demonstrated experience in preparing documents to support the development of or changes to complex engineering designs or design changes supporting facility or project scoped work.

As a Senior Mechanical Engineer, you will serve as a technical leader responsible for the design, coordination, and delivery of building mechanical systems for the SRS facilities. This role involves HVAC, plumbing, and piping system designs; potential leadership of mechanical engineering teams; and accountability for the technical quality and compliance of performed work.

The successful candidate will work closely with project management, discipline leads, and facility management to deliver fully coordinated, code-compliant, and high-quality engineering solutions in accordance with the SRS established procedures.

Key Responsibilities

• Lead and oversee the design of HVAC, plumbing, and piping systems, including B31.3 process piping.
• Develop, review, approve, and check engineering calculations, layouts, specifications, and drawings.
• Apply advanced engineering judgement to resolve complex design issues.
• Support project planning by assisting with scope definition, equipment sizing, schedule development, and budget control for mechanical design issues.
• Coordinate mechanical designs with structural, electrical, architectural, and process disciplines.
• Apply applicable codes, standards, and procedures (e.g. IMC, ASHRAE, NFPA, ASME).
• Familiar with SRS Engineering Standards Program.
• Ensure all work under your technical responsibility complies with SRS engineering and quality procedures.

Required Qualifications

• B.S. in Mechanical Engineering from an ABET accredited engineering program.
• 15 years in industrial/government design of Mechanical, HVAC, Plumbing, and related mechanical building systems.
• Demonstrated experience delivering projects from concept through detailed design completion.
• Thorough knowledge of applicable codes & standards (IMC, NFPA, ASHRAE, ASME, etc).

Preferred Requirement

• Previous demonstrated work history with the SRS Engineering Standards Program & SRS engineering procedures.

Physical Requirements

• Primarily office-based work in a secure engineering environment.
• Ability to stand or sit for extended periods.
• Ability to read and use computer-aided design software effectively.
• Appropriate PPE and training will be provided as required.

Other Requirements

• Good communication and analytical skills; knowledgeable about Microsoft Office applications.
• Willingness to work overtime or outside normal work hours as needed.
• Individuals must be capable of obtaining a DOE site security badge. The position may require the ability to pass and maintain a Security Clearance. Due to the nature of the work, the candidate must be a US Citizen; dual citizenship is not permitted.

Additional Notes

SRS office location is required; telework is situational per SRMC procedure.

Compensation Details

$110,000 – $160,000

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

• 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

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

06/01/2026 – 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.

Equal Employment Opportunity Statement

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 (https://postings.govdocs.com/#/vxSkbztPuAwwxfs).