Senior Mechanical Designer, Washington DC

System One is seeking a highly motivated Senior Mechanical Designer to support the design and development of advanced Generation IV nuclear reactor systems. This role is responsible for creating structural and mechanical design solutions, developing 3D CAD models, and producing detailed engineering drawings to support conceptual and preliminary design efforts.

The ideal candidate brings extensive experience in mechanical/structural design and drafting, with strong proficiency in SolidWorks and a deep understanding of engineering standards and design best practices.

• Develop robust 3D CAD models using advanced modeling techniques to support rapid design evolution
• Create, maintain, and review complex mechanical and structural designs
• Perform trade studies and propose innovative design solutions
• Support engineering analysis needs (structural, thermal, safety, etc.) through model configurations
• Generate and review engineering drawings including layouts, details, and general arrangements in accordance with ASME Y14.1 and Y14.5 standards
• Perform tolerance stack-up analyses
• Review and check drawings for accuracy and compliance with drafting standards
• Maintain configuration control of models and drawings using PDM/PLM systems
• Document design progress, changes, and decisions
• Support technical documentation including reports, presentations, and design reviews
• Collaborate with internal teams and external suppliers to ensure design alignment
• Contribute to continuous improvement of design standards, processes, and documentation

• 15+ years of experience in mechanical/structural design and drafting
• Strong proficiency in SolidWorks
• Experience with Geometric Dimensioning & Tolerancing (GD&T)
• Experience creating and reviewing fabrication drawings
• Strong background in Design for Manufacturability (DFM) and Design for Assembly (DFA)
• Experience in mechanical and machine design
• Experience working with Product Data Management (PDM) systems
• Strong analytical and problem-solving skills
• Ability to manage multiple priorities with minimal supervision
• Excellent communication and documentation skills

• Experience working with supplier engineering and manufacturing vendors
• Nuclear or highly regulated industry experience

• High level of integrity, professionalism, and teamwork
• Detail-oriented with strong organizational skills
• Ability to work in a fast-paced, evolving engineering environment

• Prolonged sitting and/or standing
• Fine motor skills for computer-based work
• Ability to lift up to 25 lbs
• Standard office/engineering environment (>8 hours/day)
• Occasional travel (0–5%)

System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.

System One, and its subsidiaries including Joulé, ALTA IT Services, TeamPeople, and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.