Mechanical Designer Jr

Jr-Level Mechanical Designer

Amentum is a global leader in advanced engineering and innovative solutions, supporting critical missions across defense, intelligence, energy, and civilian sectors. We are currently seeking a Jr-Level Mechanical Designer to support our Nuclear Project – Oak Ridge.

As a Jr-Level mechanical designer, you will support the design and development of HVAC, piping, and plumbing systems for industrial and government facilities, including nuclear and DOE projects. Working under the supervision of Senior Designers and Mechanical Engineers, this role contributes to the development of construction‑level design deliverables that meet project, quality, and safety requirements.

This role is ideal for an early‑career designer who is building technical skills in CAD and plant design tools, enjoys collaborative work, and is eager to grow within a multidisciplinary engineering environment.

• Develop 2D drawings for HVAC equipment, ductwork, piping, and plumbing systems using AutoCAD, Micro Station, or similar tools
• Prepare design deliverables under supervision, including equipment layouts, duct and piping plans, isometric drawings, sections, and details
• Incorporate engineer and senior designer markups and redlines into accurate drawings
• Coordinate designs with mechanical engineers and other disciplines (structural, electrical, process, I&C) and ensure proper integration with other disciplines
• Apply established design standards, procedures, and quality requirements
• Perform self‑checks and support revisions to drawings as directed
• Participate in field walkdowns or site coordination activities when needed

• High School Diploma or GED (Associate Degree in Drafting, Design, or Engineering Technology preferred)
• 0 to 5 years of experience in mechanical design for industrial or government facilities
• Experience with HVAC, piping, and plumbing layout design
• Working knowledge of 3D design software such as AutoCAD and Micro Station
• Ability to learn new software tools, workflows, and design standards
• Strong attention to detail and willingness to accept technical guidance and feedback
• Effective communication skills and ability to work in a team‑based environment

• Prior nuclear, DOE, or high‑hazard facility design experience
• Experience working under a formal quality program (ISO 9001, NQA
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• Experience supporting multidisciplinary design teams
• Demonstrated interest in professional growth and technical development

• This position is primarily located onsite at an active industrial construction project
• The work environment may involve frequent presence in construction and operational areas with exposure to elevated noise levels, hazardous materials, and other site‑specific hazards
• Adherence to project safety requirements and site access controls is required

• 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

• 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 engineer

$55,000 – $65,000

• 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

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.

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