Mid-Level Plant Designer

Plan Designer Mid

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 Plant Designer to support our Oak Ridge, Tennessee office.

Looking for a Plant Designer to participate in the design process, assisting in developing design calculations using standard and advanced analysis (FEA software) techniques, developing design drawings, and construction specifications for structures made of steel, concrete, and masonry. You will be able to participate and focus on new design challenges, expanding career skills while supporting the development of life changing infrastructure that improves communities all over the United States.

The necessary Job skills will include but are not limited to:

• A general understanding of Building Mechanical Systems: HVAC/Piping/Plumbing
• Develop piping systems and equipment layout in SmartPlant 3D or similar BIM design tools.
• Developing General Equipment Arrangement Deliverables.
• A basic understanding of schedules and budgets of the Plant Design and Piping Team.
• Assist with resolving interferences and developing resolutions
• Ensuring proper integration with other BIM tools such as Intelligent Schematics.
• Working with Piping Engineering on Pipe Specifications and Stress analysis support locations.
• Working with Structural Engineering for Pipe Support designs.
• Managing the model outputs for material lists and reports.
• Working with Civil on underground interface connections

Work Location:

This position is designed to support either in-office or remote work, with a strong preference for the successful candidate to work from Amentum's office in Oak Ridge, Tennessee. Employees who reside within 50 miles of Oak Ridge will be expected to work from the Oak Ridge office. Employees who live more than 50 miles away are eligible for a remote work arrangement; however, remote employees must travel to the Oak Ridge office on a quarterly basis. Those working remotely are required to maintain a company-approved secure workspace that meets all client security requirements and is located within the United States. This U.S.-based secure work location requirement applies to all projects associated with the position.

Qualifications

• AS Degree or Higher
• 5+ years using BIM tools for Plant Design
• Chemical process industrial mechanical/piping design experience
• Nuclear piping design experience is preferred

Essential Functions

Intermittent sitting, walking, standing, bending, squatting, climbing, kneeling, twisting, and lifting. Lifting requirements limited to 20 lbs. in the form of supplies, drawings, etc. Longest distance carried is 50 feet. Hand manipulation is required for simple grasping, pushing and pulling, and fine manipulation. Right and/or left hands utilized. Occasional need to reach and/or work above the shoulder, for supplies, as well as below the shoulder for same. No foot controls necessary. Must be alert to equipment in the field, there will be occasional travel, will work near construction job site equipment when in the field, occasional need to work near hazardous equipment and machinery, occasional need to walk on uneven ground, exposure to dust, gas or fumes, exposure to noise, extremes in temperature or humidity, and potential work at heights.

OTHER ESSENTIAL FUNCTIONS

• U.S. Citizenship required.
• Valid driver’s license is required. Must be able to work in a team atmosphere.
• Must put forward professional behavior that enhances productivity and promotes teamwork and cooperation.
• Grooming and dress must be appropriate for the position and must not impose a safety risk/hazard on the employee or others.
• Must take and pass a pre-employment drug and background check.

Compensation Details:

$35.00 - $70.00

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:

11/03/2026 - 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.