Staff Mechanical Engineer

The Nuclear Company is the fastest growing AI tech-enabled startup in the nuclear and energy space, pioneering a fleet-scale approach to building the next generation of nuclear reactors. Through our design-once, build-many model, we're accelerating the deployment of safe, reliable, and affordable nuclear energy. We operate with an AI-first mindset. Every employee is expected to leverage AI, technology, and the Nuclear Operating System (NOS) as integral components of their role to improve the quality, speed, and impact of their work. We expect every team member to continuously identify opportunities to automate workflows, enhance decision-making, improve processes, and contribute to the ongoing evolution of NOS as a strategic operating capability that enables The Nuclear Company to scale with excellence. We hire people who are driven by purpose, thrive in ambiguity, and are energized by building what has never been built before. Our team combines intellectual curiosity with high agency, embraces candid feedback and continuous learning, and holds themselves and others to exceptional standards. Our values—Transparency, Responsibility, Unity, Scrappy, and Tenacity—guide how we hire, collaborate, and make decisions every day. They are not words on a wall; they are the standard by which we operate. TRUST is the foundation of our safety culture, fostering intellectual honesty, accountability, and open communication, while our values challenge every team member to execute with urgency, humility, resilience, and an unwavering commitment to our mission. About the role The Staff Mechanical Engineer will be a technical lead responsible for designing, analyzing, and maintaining complex mechanical systems and components for nuclear power plants (operating or a new build) or advanced reactor projects. They will work with a multi-discipline team of engineers in the design, analysis, and evaluation of systems and components using engineering software, including support to lead engineers. They apply advanced engineering principles and engineering codes & standards, such as AMSE and ANSI, to develop solutions that meet strict safety, regulatory, and quality standards. They will resolve technical issues for operating nuclear power plants, new plants, and other nuclear and non-nuclear projects. This role supports Corporate initiatives as well as ongoing construction projects. Responsibilities

• Design and analysis of mechanical components and systems.
• Prepare engineering calculations, drawings and specifications.
• Prepare or review engineering modification packages.
• Provide technical guidance to junior engineering staff.
• Diagnose mechanical equipment failures, support root cause analyses, and implement corrective actions.
• Conduct calculations and analyses to ensure the structural integrity and performance of mechanical systems.
• Review vendor documentation and technical specifications.
• Participate in design reviews and technical meetings.
• Interface with engineers in other disciplines such as civil/structural, electrical and instrumentation and controls (I&C).
• Support the implementation of quality assurance and quality control programs.
• Prepare technical reports and documentation.

Experience

• Bachelor of Science (B.S.) degree in Mechanical Engineering from ABET Accredited University.
• Engineering in Training (EIT) license. Professional Engineer license is a plus.
• 8+ years of engineering experience.
• Strong understanding of mechanical engineering principles and practices.
• Proficiency in engineering software (e.g., AutoCAD, SolidWorks, ANSYS).
• Must be capable of obtaining security clearance for unescorted access to a nuclear station.
• Good communication and interpersonal skills.
• Strong analytical and problem-solving skills.

Preferred Experience

• Previous causal analysis experience is a plus.
• Previous qualified standard design experience is a plus.
• AI-Enhanced Simulation & Analysis: Familiarity with AI-augmented engineering simulation tools that complement traditional software (e.g., ANSYS, SolidWorks) to accelerate structural integrity calculations, thermal-hydraulic analyses, and performance optimization of mechanical systems and components.
• Digital Twin & Smart Monitoring: Familiarity with digital twin technologies or IoT-integrated monitoring systems that use real-time data and machine learning to model mechanical system behavior, enabling proactive maintenance planning and performance trending across plant systems.

Benefits

• Competitive compensation packages
• 401k with company match
• Medical, dental, vision plans
• Generous vacation policy, plus holidays

Estimated Starting Salary Range The estimated starting salary range for this role is $xxxxx - $xxxxx annually less applicable withholdings and deductions, paid on a bi-weekly basis. The actual salary offered may vary based on relevant factors as determined in the Company’s discretion, which may include experience, qualifications, tenure, skill set, availability of qualified candidates, geographic location, certifications held, and other criteria deemed pertinent to the particular role. EEO Statement The Nuclear Company is an equal opportunity employer committed to fostering an environment of inclusion in the workplace. We provide equal employment opportunities to all qualified applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected characteristic. We prohibit discrimination in all aspects of employment, including hiring, promotion, demotion, transfer, compensation, and termination. Export Control Certain positions at The Nuclear Company may involve access to information and technology subject to export controls under U.S. law. Compliance with these export controls may result in The Nuclear Company limiting its consideration of certain applicants.

Recruiting Fraud Alert Your safety is our priority. We want to ensure your job search stays secure. Please note that the team at The Nuclear Company only communicates through official @thenuclearcompany.com email addresses. We will never ask for payments or sensitive financial information at any stage of our recruitment process. For your peace of mind, please verify all openings and submit your applications directly through our official careers page.