Systems Engineer

X-energy LLC conducts a thorough recruiting process and will never issue offers without interview to discuss qualifications and responsibilities. All applications will be submitted via our company career page, www.x-energy.com/careers/ . We will never ask you to provide payment information as part of the recruiting process. If anyone claiming to represent X-energy directs you in a manner otherwise, please contact us at www.x-energy.com/contact-us . Job Description This role is responsible for executing rigorous systems engineering processes to support the design, integration, and management of complex nuclear systems throughout their lifecycles. Working within established model-based systems engineering frameworks, this position ensures all system components work together effectively and meet project requirements. The Systems Engineer focuses on verifying and validating product requirements according to the systems engineering lifecycle process while maintaining clear documentation of design decisions and system interfaces. This Systems Engineer III-IV role owns the complete lifecycle journey of complex nuclear fuel production systems from initial concept through operations, executing INCOSE-aligned systems engineering processes at every phase. The engineer establishes and maintains enterprise engineering procedures defining how design control, configuration management, verification & validation (V&V), and quality assurance (QA) are executed. Throughout the lifecycle journey, the Systems Engineer owns multi-system integration and manages configuration baselines for assigned subsystems, ensuring all components work together effectively and meet NRC and DOE requirements. Core responsibilities include interface management, design change control, and comprehensive V&V activities – managing Requirements Verification Traceability Matrices (RVTM), developing and executing test plans, overseeing Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT), and applying rigorous verification methods (inspection, analysis, demonstration, and test). The engineer manages requirements traceability using JAMA as the primary platform (IBM DOORS experience transferable) and coordinates cross-discipline activities using JIRA for project management and issue tracking. The role requires proven systems engineering leadership: translating ambiguous high-level direction into actionable plans, driving cross-functional efforts to completion with minimal oversight, and resolving stakeholder concerns through systematic problem-solving. Job Profile Tasks/Responsibilities Apply systems thinking and take a holistic approach to solve problems, analyze and design systems, considering the interdependencies and interactions between various components. Lead and manage systems engineering lifecycle efforts surrounding: Stakeholder and operational analysis Requirement identification, decomposition, and management Functional decomposition and modeling Logical system architecture development and modeling Physical product definition, interface management, and change control Design integration and testing System verification and validation Concept of operations development and modeling Develop and maintain system behavior models using model-based systems engineering (MBSE) tools within established Product Lifecycle Management (PLM) frameworks. Lead the identification and monitoring of technical risks and the development of risk mitigation strategies. Support value engineering activities including cost analyses, economic feasibility assessments, and cost reduction opportunity identification. Write and review engineering documentation, reports, and communicate technical details and project progress to technical and non-technical stakeholders. Execute systems engineering processes within X-energy's quality management framework. Work across engineering disciplines to ensure effective integration of system components and subsystems. Perform work in accordance with X-energy quality assurance procedures to ensure engineering products meet required standards. Always maintain professional demeanor and behavior in all forms of communication. Perform other duties as assigned by manager. Level I : Assist and support team members with the execution of the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document, under guided supervision. Establish a foundation in nuclear systems design and nuclear quality assurance requirements while deepening understanding of, and experience with processes, tools, and key product and safety considerations for nuclear components, systems, and facilities. Level II:  Support team members with the execution of the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document, under guided supervision. Coordinate with engineering team members, partners, and suppliers (where applicable) to facilitate the convergence of efforts, guide implementation, provide engineering assurance, and deliver high-quality engineering work products. Level III:  Execute the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document, under minimal supervision. Provide ownership, responsibility, and accountability over technical scope involving the coordination of multiple individual contributors working in a specific area. Level IV:  Lead the execution the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document, without close supervision and some latitude for independent judgment. Provide feedback and guidance to more junior team members with the execution of the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document. Lead small groups of engineers to solve complex technical problems and deliver high-quality engineering work products on time and within budget.