Senior Mechanical Engineer

Amentum; United States; On-site; USD 140,000 - 165,000; Full time

Benefits offered by this job

Health, dental, and vision insurance

Paid time off and holidays

Retirement plan

Job summary

Amentum is seeking a Senior Mechanical Engineer to lead design of HVAC, plumbing, and piping systems for industrial and government facilities. You will coordinate mechanical designs across disciplines and mentor engineers, delivering projects from concept to detailed design with compliance to codes and standards.

The role requires ABET-accredited mechanical engineering, 15+ years of relevant experience, and a PE license.

Qualifications

• B.S. Mechanical Engineering from an ABET accredited program.
• 15+ years in industrial/government design of mechanical, HVAC, plumbing systems.
• Proven ability to lead teams within budget and schedule constraints.
• PE license required.

Responsibilities

• Lead and oversee the 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.
• Mentor and guide engineers and designers on codes, standards, and best practices.
• Ensure all work complies with engineering and quality procedures.

Skills

HVAC design

Plumbing systems

Piping systems

Team leadership

Engineering calculations

Code compliance

PE license

Education

ABET-accredited B.S. Mechanical Engineering

Tools

Carrier HAP

Trane TRACE

PipeFlo

AutoCAD

MicroStation

Job description

Senior Mechanical Engineer

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 Senior Mechanical Engineer to support our Projects.

Description

As a senior-level mechanical engineer, you will serve as a technical leader responsible for the design, coordination, and delivery of building mechanical systems for industrial and government facilities. This role includes oversight of HVAC, plumbing, and piping system designs; leadership of mechanical engineering teams; and accountability for technical quality and compliance throughout the project lifecycle.

Key Responsibilities

• Lead and oversee the 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
  • 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

Basic Qualifications

• B.S. Mechanical Engineering from an ABET accredited engineering program
• 15+ years in industrial/government design of Mechanical, HVAC, Plumbing Systems, and related mechanical building systems
• Demonstrated experience delivering projects from concept through detailed design completion
• Proven ability to lead teams of engineers and designers within budget and schedule constraints
• Proficiency with discipline-specific tools such as: Carrier HAP, Trane TRACE, PipeFlo, AutoCAD, MicroStation, etc.
• Thorough knowledge of applicable codes & standards (International Mechanical Code, NFPA, ASHRAE, etc.)
• Professional Engineer (PE) license required

Preferred Qualifications

• Prior nuclear, DOE, or high‑hazard facility design experience
• 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
• Proficiency with Microsoft Office (Excel, Word, Outlook)

Work Environment

• Primarily office-based work in a secure engineering environment
• Amentum office location is preferred; hybrid or remote work may be available by prior agreement based on role and project requirements
• Occasional exposure to industrial facilities, which may include elevated noise levels, hazardous materials, or controlled areas
• Site visits may be 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 engineering environment
• Travel required: less than 10%

Compensation Details

$140,000 - $165,000

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

• Health, dental, and vision insurance
• Paid time off and holidays
• Retirement be