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🥝 Senior Mechanical Engineer (E4/E5)

System One | Hartsville, United States | Posted May 30, 2026

Job Description

Job Title: Senior Mechanical Engineer (E4/E5)
Company: System One
Location: Remote or Onsite (Naperville, IL | Atlanta, GA | Ridgeland, MS)
Position Type: Long-Term Contract
Position Overview
System One is seeking a Senior or Specialist Mechanical Engineer (E4/E5) to support design modification packages for mechanical systems and components in nuclear power plants. This role is part of a growing engineering team focused on delivering high-quality solutions for complex nuclear projects.

The ideal candidate will bring strong technical expertise in mechanical system design, along with the ability to lead projects, review complex calculations, and mentor junior engineers.
Key Responsibilities

+ Develop and support engineering design modification packages for nuclear plant systems

+ Perform and review complex calculations and design deliverables

+ Analyze mechanical and electromechanical systems using principles of:

+ Mechan...

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