Engineer IV, Nuclear

Engineer IV, Nuclear

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X-energy LLC conducts a thorough recruiting process and will never issue offers without an interview to discuss qualifications and responsibilities. All applications will be submitted via our company career page,  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

X-energy LLC is hiring an experienced Engineer responsible for developing and executing the V&V/CGD plans for SCALE and MCNP. The Engineer IV will perform engineering tasks associated with designing, developing, and conducting analyses of a nuclear reactor or nuclear facility.

• Develop and execute the V&V/ Commercial Grade Dedication (CGD) plans for SCALE and MCNP.
• Perform design, analysis, and evaluation in assigned projects using sound engineering principles and adhering to business standards, practices, procedures, and product/program requirements.
• Collaborate in planning, scheduling, and organizing detailed phases of engineering work.
• Collaborate in the technical oversight and direction of internal or external design teams.
• Facilitate and assist in the assessment of customer needs and capture requirements and functions related to nuclear engineering.
• Execute nuclear engineering assignments with clear and specified objectives; utilize conventional specifications and/or Interface Control Documents and plans.
• Recommend system design alterations and enhancements to improve quality of products and/or procedures from an assembly, transportation, construction, commissioning, operations, maintenance, and/or decommissioning perspective.
• Lead reviews and presentations for internal company design reviews and customer design reviews regarding nuclear design.
• Organize engineering efforts in assigned areas between specialty and other engineering groups or disciplines, with the client, suppliers, contractors, or other groups as required.
• Maintain a professional demeanor and behavior at all times, in all forms of communication.
• Lead the execution of 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.
• Perform other duties as assigned by manager.

• Perform benchmark analyses against experimental data and other code packages and quantify uncertainties in computational models and develop methods to address them.
• Verify and validate nuclear physics calculations that support our reactor design, licensing, and safety analysis activities.
• Document V&V activities in accordance with NQA‑1 and regulatory requirements and support licensing activities through rigorous validation of safety‑related calculations.

• Bachelor’s degree in nuclear engineering or related degree from an accredited institution.
• Typically, ten years of experience in an engineering role.
• A master’s degree in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of two years of experience.
• A Ph.D. in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of three years of experience.
• Previous experience at X‑energy exceeding performance standards may be in lieu of years of experience.
• Possess technical experience and proven expertise in one or more of the following areas:
  • Reactor core design and analysis.
  • Radiation shielding…