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. 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 Jr-Level Mechanical Designer to support our Nuclear Project – Oak Ridge.

Description:

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.

Key Responsibilities:

• Develop 2D drawings for HVAC equipment, ductwork, piping, and plumbing systems using AutoCAD, MicroStation, 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)
• Ensure proper integration of mechanical designs 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

Basic Qualifications:

• 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 MicroStation
• 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

Preferred Qualifications:

In addition to the Basic Qualifications the ideal candidate might also have:

• Prior nuclear, DOE, or high‑hazard facility design experience
• Experience working under a formal quality program (ISO 9001, NQA 1)
• Experience supporting multidisciplinary design teams
• Demonstrated interest in professional growth and technical development

Work Environment:

• 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

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 engine

       

Compensation Details:

$55,000 – $65,000

       

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:

05/07/2026 - 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.