We are seeking a mechanical engineering professional to be based in Oak Ridge, Tennessee, this role will provide design engineering support for large-scale, complex projects for a diverse portfolio of clients that includes the U.S. Department of Energy, the National Nuclear Security Administration (NNSA), and commercial nuclear companies. The successful candidate will provide leadership across capital projects involving nuclear infrastructure, advanced reactor deployment, fuel cycle facilities, and mission-critical national security programs while ensuring the highest standards of safety, quality, regulatory compliance, and financial performance.
This is an opportunity to play a key role in delivering projects that strengthen America's nuclear security mission, support the deployment of next-generation nuclear technologies, and expand the nation's commercial nuclear capabilities.
Amentum Nuclear Projects is a Tier 1 services provider supporting the U.S. Department of Energy's, the National Nuclear Security Administration (NNSA), and leading commercial nuclear companies. We deliver safe, innovative, and mission-focused solutions at some of the nation's most complex nuclear security, production, and advanced nuclear technology facilities.
Our core capabilities include:
Program and project management
NNSA capital line-item projects
Naval Reactors facility designs
Nuclear facility modernization and construction management
Nuclear material and fuel cycle management
Technical consulting and owner's engineering
Engineering, procurement, and construction management (EPCM) projects
Engineering and project delivery for advanced reactor programs, including Small Modular Reactors (SMRs) and advanced reactor technologies
Engineering support for commercial nuclear fuel fabrication facilities
Engineering and project execution for nuclear fuel reprocessing and related fuel cycle infrastructure
Job Description
As an Entry Level Mechanical Engineer, you will be responsible for the design, coordination, and delivery of building mechanical systems for industrial and government facilities. This role includes oversight of HVAC, plumbing, and piping system designs; leadership of mechanical engineering teams; and accountability for technical quality and compliance throughout the project lifecycle.
The successful candidate will work closely with project management, discipline leads, and clients to deliver fully coordinated, code-compliant, and high-quality engineering solutions in accordance with Amentum's established quality procedures.
Key Responsibilities:
Perform design of HVAC, plumbing, and piping systems, including B31.3 process piping
Serve as technical authority for mechanical system design within assigned project scope
Review, approve, and check engineering calculations, layouts, specifications, and drawings
Apply advanced engineering judgment to resolve complex design issues
Support project planning by assisting with:
Scope definition
Equipment sizing
Schedule development
Budget control for mechanical design activities
Coordinate mechanical designs with structural, electrical, architectural, and process disciplines
Apply applicable codes, standards, and procedures (e.g., IMC, ASHRAE, NFPA, ASME)
Interface with clients and other stakeholders as a senior technical contributor
Provide senior-level support during procurement and construction phases, including review and resolve RFIs, submittals, and field issues
Mentor and guide engineers and designers on applicable codes, standards, and best practices
Ensure all work under your technical responsibility complies with Amentum's engineering and quality procedures
Basic Qualifications:
B.S. Mechanical Engineering from an ABET accredited engineering program
Proficiency with discipline-specific tools such as: Carrier HAP, Trane TRACE, PipeFlo, AutoCAD, MicroStation, etc.
Knowledge of applicable codes & standards (International Mechanical Code, NFPA, ASHRAE, etc.)
USA citizenship is required
Preferred Qualifications:
In addition to the Basic Qualifications the ideal candidate might also have:
Prior nuclear, DOE, or high-hazard facility design experience
Industrial/government design of Mechanical, HVAC, Plumbing Systems, and related mechanical building systems
Professional Engineer (PE) license
Experience working under a formal quality program (ISO 9001, NQA 1)
Strong leadership, communication, and technical mentoring skills
Demonstrated attention to detail and commitment to technical excellence
Proficiency with Microsoft Office (Excel, Word, Outlook)
Work Environment:
Primarily office-based work in a secure engineering environment?
Amentum office location is preferred; hybrid or remote work may be available by prior agreement based on role and project requirements
Occasional exposure to industrial facilities, which may include elevated noise levels, hazardous materials, or controlled areas
Site visits may be required
Physical Requirements: ?
Ability to sit or stand for extended periods
Ability to lift up to 35 lbs?occasionally
Vision correctable to 20/20
Ability to read and use computer-aided design software effectively
Appropriate PPE and training will be provided as required
Compliance & Eligibility Requirements:
U.S. Citizenship required (no dual citizenship)
Valid driver's license is required
Ability to obtain and maintain a security clearance
Ability to pass?pre-employment background investigation and drug screening
Willingness to work overtime or outside normal hours as needed
Professional appearance appropriate for a customer-facing engineering environment
Travel required: less than 10%
Compensation Details:
$80,000 - $100,000
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:
08/12/2026 - 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 (https://postings.govdocs.com/#/vxSkbztPuAwwxfs) .
