At BWX Technologies, Inc. (NYSE: BWXT), we are People Strong, Innovation Driven. A U.S.-based company, BWXT is a Fortune 1000 and Defense News Top 100 manufacturing and engineering innovator that provides safe and effective nuclear solutions for global security, clean energy, environmental restoration, nuclear medicine and space exploration. With more than 7,800 employees, BWXT has 14 major operating sites in the U.S., Canada and the U.K. We are the sole manufacturer of naval nuclear reactors for U.S. submarines and aircraft carriers. Our company supplies precision manufactured components, services and fuel for the commercial nuclear power industry across four continents. Our joint ventures provide environmental restoration and operations management at a dozen U.S. Department of Energy and NASA facilities. BWXT's technology is driving advances in medical radioisotope production in North America and microreactors for various defense and space applications. For more information, visit www.bwxt.com . Follow us on LinkedIn (https://www.linkedin.com/company/bwx-technologies/mycompany/?viewAsMember=true) , X (https://twitter.com/BWXT) , Facebook (https://www.facebook.com/BWXTech) and Instagram (https://www.instagram.com/bwxtechnologies/) . **Welcome to BWXT** We believe in empowering our employees and cultivating a dynamic workplace that fosters growth and collaboration. Whether you're an experienced professional or just starting your career, you'll find opportunities to challenge yourself, learn from seasoned experts, and contribute to nuclear innovation. We require a diverse range of skills to support our work in the markets that drive our business and welcome candidates from all backgrounds and life stages who are passionate about making a difference. **Position Overview:** BWXT Advanced Technologies is seeking a Mechanical System Design Engineer. This position is focused on system design, not detailed component design, and will report administratively to the Mechanical System Design Supervisor. The System Design Engineering group supports programs for internal and external customers across Advanced Manufacturing, Medical Radioisotopes, and Nuclear Reactor Design. **Location:** On-site in Lynchburg, Virginia **Your Day to Day as a Mechanical System Design Engineer:** + Identify relevant system requirements and interface requirements then prepare appropriate system design documentation such as system design descriptions and control narratives. + Select components (e.g., valves, heat exchangers), perform basic calculations, and prepare specifications for their detailed design. + Design piping systems including line sizing and pressure drop calculations. + Create appropriate output documentation such as process flow diagrams, P&IDs, component data sheets and system test request documentation. + Utilize appropriate regulations, design codes and standards (e.g., ASME) for fluid systems. + Coordinate with other interfacing disciplines such as electrical engineers, I&C engineers, mechanical equipment designers, and test engineers. + Prepare and present system design results to internal and external stakeholders. **Required Qualifications:** + A Bachelor's degree in Physics or an Engineering discipline is required. + A minimum of four (4) years of relevant work experience is required. + Must possess a technical background in mechanical engineering design, fluid systems, thermodynamics, and process instrumentation. + Proficiency with standard Microsoft Office applications is required. + Excellent written and verbal communication skills are required. + Must possess the ability to self-direct with minimal day-to-day supervision. + Must be a U.S. citizen. + Must be able to obtain and maintain a U.S. Department of Energy (DOE) or Department of Defense (DOD) security clearance, whichever is required. **Preferred Qualifications:** + Previous nuclear reactor experience. + Experience with MatLab, and/or MathCad. + Experience with 2D or 3D computer modeling. + Pipe Stress Analysis experience. + Experience with system analysis tools such as Simulink, Flownex, Relap, or Gothic. **What We Offer:** + Competitive salary and benefits package, including health, dental, and retirement plans. + Flexible work schedules and paid time off to promote a healthy work-life balance. + Professional development opportunities, including mentorship programs and sponsorship for continuing education. + An inclusive atmosphere that celebrates new perspectives and supports collaboration between different generations. + The chance to be part of a mission-driven organization making a positive impact on the future of energy. + Opportunities for continuous learning and training to grow throughout your career! Pay: $[[cust_salaryMin]] - $[[cust_salaryMax]] The base salary range for this position in [[stateProvince]] at the start of employment is expected to be between $[[cust_salaryMin]] and $[[cust_salaryMax]] per ye