Entry-Level Mechanical Engineer

About the Role

We are seeking a mechanical engineering professional to provide design engineering support for large-scale, complex projects for clients including the U.S. Department of Energy, the National Nuclear Security Administration (NNSA), and commercial nuclear companies. This role will provide leadership across capital projects involving nuclear infrastructure, advanced reactor deployment, fuel cycle facilities, and mission-critical national security programs, ensuring the highest standards of safety, quality, regulatory compliance, and financial performance.

Key Responsibilities

• Perform design of HVAC, plumbing, and piping systems, including B31.3 process piping.
• Serve as technical authority for mechanical system design within assigned project scope.
• Review, approve, and check engineering calculations, layouts, specifications, and drawings.
• Apply advanced engineering judgment to resolve complex design issues.
• Support project planning by assisting with scope definition, equipment sizing, schedule development, and budget control for mechanical design activities.
• Coordinate mechanical designs with structural, electrical, architectural, and process disciplines.
• Apply applicable codes, standards, and procedures (e.g., IMC, ASHRAE, NFPA, ASME).
• Interface with clients and other stakeholders as a senior technical contributor.
• Provide senior-level support during procurement and construction phases, including review and resolve RFIs, submittals, and field issues.
• Mentor and guide engineers and designers on applicable codes, standards, and best practices.
• Ensure all work under your technical responsibility complies with Amentum’s engineering and quality procedures.

Requirements & Tech Stack

• B.S. Mechanical Engineering from an ABET accredited engineering program.
• Proficiency with discipline-specific tools such as: Carrier HAP, Trane TRACE, PipeFlo, AutoCAD, MicroStation.
• Knowledge of applicable codes & standards (e.g., International Mechanical Code, NFPA, ASHRAE).
• Proficiency with Microsoft Office (Excel, Word, Outlook).

Qualifications

• U.S. citizenship is 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%.

Preferred Qualifications:

• Prior nuclear, DOE, or high-hazard facility design experience.
• Industrial/government design of Mechanical, HVAC, Plumbing Systems, and related mechanical building systems.
• Professional Engineer (PE) license.
• Experience working under a formal quality program (ISO 9001, NQA 1).
• Strong leadership, communication, and technical mentoring skills.
• Demonstrated attention to detail and commitment to technical excellence.