Senior-Level Mechanical Designer (Hybrid/Remote)

AmentumOak Ridge, TN
$60 - $79Hybrid

About The Position

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.

Requirements

  • 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
  • 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

Nice To Haves

  • 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

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

Benefits

  • 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
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