Mid-Level Mechanical Designer (Hybrid/Remote)

Amentum•Oak Ridge, TN

1d•Hybrid

About The Position

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 Group. As a mid-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. Working under the guidance of Senior Designers and Mechanical Engineers, you will develop 3D models and produce detailed design deliverables while coordinating closely with multidisciplinary teams to deliver fully integrated, high‑quality design packages. This role requires strong technical proficiency with BIM and plant design tools and the ability to work independently on assigned design tasks within established quality and project standards.

Requirements

High School Diploma or GED (Associate Degree in Drafting, Design, or Engineering Technology preferred)
5+ years of experience in mechanical design for industrial or government facilities
Experience with HVAC, piping, and plumbing layout design
Proficiency with 3D modeling tools such as: SmartPlant 3D / Plant 3D / Revit.
Ability to learn new design software and workflows efficiently
Self‑motivated, detail‑oriented, and team‑focused work style
Strong communication and coordination skills
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%

Nice To Haves

Prior 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

Responsibilities

Develop 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 markups, and redlines into constructible models and drawings
Coordinate designs with mechanical engineers and other disciplines (structural, electrical, process, I&C)
Participate in interference detection and resolution (clash reviews)
Ensure proper integration of mechanical designs with other models and project tools
Apply established design standards, procedures, and quality requirements
Perform self‑checks and assist senior staff with drawing corrections and revisions
Participate in field walkdowns or site coordination activities when needed