Senior-Level Mechanical Designer (Hybrid/Remote)
Amentum, Oak Ridge, TN, United States
Senior-Level Mechanical Designer (Hybrid/Remote)
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 currently seeking a Mid-Level Mechanical Designer to support our Nuclear Projects – Oak Ridge.
Description:
As a senior-level mechanical designer, you will provide support for the design and development of HVAC, piping, and plumbing systems for industrial and government (nuclear / DOE) facilities. This role is responsible for the creation, coordination, and checking of complex 3D models and drawing packages, while working closely with mechanical engineers and multidisciplinary teams to deliver high‑quality, fully coordinated design deliverables.
The Senior Mechanical Designer serves as a technical leader within the design team, providing mentoring to junior designers and ensuring designs comply with project requirements, codes, and established quality procedures.
Key Responsibilities:
Develop and maintain 3D models for HVAC equipment, ductwork, piping, and plumbing systems using SmartPlant 3D, AutoCAD Plant 3D, Revit, or similar tools
Produce detailed design deliverables, including:
Equipment layouts
Duct and piping plans
Isometric drawings
Sections, and details
Incorporate engineering design criteria, markups, and redlines into constructible models and drawings
Coordinate designs with mechanical engineers and other disciplines (architectural, structural, electrical, process, I&C, etc.)
Participate in interference detection and resolution (clash reviews)
Perform peer checking and quality reviews of drawings and models created by other designers
Ensure design outputs comply with applicable project standards, client requirements, and quality assurance procedures
Provide direction and mentorship to junior and mid‑level designers
Assist with task planning and workload coordination within the design team
Support training and standardization efforts for design tools and workflows
Basic Qualifications:
High School Diploma or GED (Associate Degree in Drafting, Design, or Engineering Technology preferred)
15+ years of experience in mechanical design for industrial or government facilities
Strong experience with HVAC, piping, and plumbing layout design
Proficiency with 3D modeling tools such as: SmartPlant 3D / Plant 3D / Revit.
Ability to read and interpret engineering calculations, P&IDs, and specifications
Experience producing fully coordinated drawing packages
Preferred Qualifications:
In addition to the Basic Qualifications the ideal candidate might also have:
Prior industrial, nuclear, DOE, or high‑hazard facility design experience
Experience working under a formal quality program (ISO 9001, NQA 1)
Strong organizational and communication skills
Demonstrated attention to detail and commitment to technical excellence
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:
$60 - $79
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:
04/20/2026 - 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.
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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 currently seeking a Mid-Level Mechanical Designer to support our Nuclear Projects – Oak Ridge.
Description:
As a senior-level mechanical designer, you will provide support for the design and development of HVAC, piping, and plumbing systems for industrial and government (nuclear / DOE) facilities. This role is responsible for the creation, coordination, and checking of complex 3D models and drawing packages, while working closely with mechanical engineers and multidisciplinary teams to deliver high‑quality, fully coordinated design deliverables.
The Senior Mechanical Designer serves as a technical leader within the design team, providing mentoring to junior designers and ensuring designs comply with project requirements, codes, and established quality procedures.
Key Responsibilities:
Develop and maintain 3D models for HVAC equipment, ductwork, piping, and plumbing systems using SmartPlant 3D, AutoCAD Plant 3D, Revit, or similar tools
Produce detailed design deliverables, including:
Equipment layouts
Duct and piping plans
Isometric drawings
Sections, and details
Incorporate engineering design criteria, markups, and redlines into constructible models and drawings
Coordinate designs with mechanical engineers and other disciplines (architectural, structural, electrical, process, I&C, etc.)
Participate in interference detection and resolution (clash reviews)
Perform peer checking and quality reviews of drawings and models created by other designers
Ensure design outputs comply with applicable project standards, client requirements, and quality assurance procedures
Provide direction and mentorship to junior and mid‑level designers
Assist with task planning and workload coordination within the design team
Support training and standardization efforts for design tools and workflows
Basic Qualifications:
High School Diploma or GED (Associate Degree in Drafting, Design, or Engineering Technology preferred)
15+ years of experience in mechanical design for industrial or government facilities
Strong experience with HVAC, piping, and plumbing layout design
Proficiency with 3D modeling tools such as: SmartPlant 3D / Plant 3D / Revit.
Ability to read and interpret engineering calculations, P&IDs, and specifications
Experience producing fully coordinated drawing packages
Preferred Qualifications:
In addition to the Basic Qualifications the ideal candidate might also have:
Prior industrial, nuclear, DOE, or high‑hazard facility design experience
Experience working under a formal quality program (ISO 9001, NQA 1)
Strong organizational and communication skills
Demonstrated attention to detail and commitment to technical excellence
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:
$60 - $79
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:
04/20/2026 - 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