X-energy

Role Description This role is responsible for the development and execution of cyber security engineering strategies and activities in support of plant design and engineering teams. This role integrates the cyber security philosophy into the design of plant information and operational technology systems and is responsible for implementation and assessment of cyber security systems, supports the cyber security assessments of Xe-100 systems, and recommends solutions to cyber security issues. Candidates with 5 years or more combined experience of Cyber Engineering, IT Networking and Operational Technologies preferred for this position. Qualifications - Typically, five plus years of progressive experience in cybersecurity, network security, and operational technologies required. - Must have direct knowledge and experience managing cybersecurity tools such as NDR, EDR, and SIEM. - GICSP, GCIH, GPEN, CISSP, or equivalent, or other specific training or experience in cyber security operations, design, and engineering. - Familiarity with standard principles and practices of cybersecurity design for safeguarded plants and facilities. - Networking/IT systems engineering background and experience. - Knowledge of Federal requirements for Cyber security for Critical Infrastructure Protection (CIP). - Knowledge of IEEE and IEC standards related to cyber security in embedded system and control systems. - Proficiency in developing and reviewing threat assessments and using results of those assessments to develop comprehensive cyber security designs. - Proficiency developing cybersecurity programs, procedures, and processes. - Understanding of nuclear engineering, licensing, regulatory, quality, and safety requirements preferred. Requirements - Collaborate in strategic security relationships between internal resources and external entities to fully secure information, computer, network, and processing systems, including government, customers, vendors, and partner organizations. - Apply industry experience to architect, develop, implement, maintain, and oversee cybersecurity tools and policies to protect X-energy business and plant operations information systems, including cloud governance and security. - Where necessary, provide advanced support to help troubleshoot complex issues and architect new solutions. - Construct and exploit threat intelligence to detect, respond, and defeat advanced persistent threats (APTs). - Produce reports on all activities and incidents to help maintain day-to-day status, develop, and report on trends, and provide focus and situational awareness on all issues. - Identify and remediate control weaknesses. - Review data with firewall administrators, engineering, system administrators, and other appropriate groups to determine the risk of security events. - Perform intermediate level information security analysis work. - Develop plans to safeguard computer/server/network configurations and data files against accidental or unauthorized modification, destruction, or disclosure and to meet emergency data processing needs. - Perform and review technical risk assessments of new and existing applications. - Research, evaluate, and recommend systems and procedures to prevent, detect, containment, and correct data security breaches. - Maintain professional demeanor and behavior at all times in all forms of communication. - Perform other duties as assigned by manager. Benefits - 401K plan with an employer match - Medical/Dental/Vision Insurance - Life and Disability Insurance - Paid Time Off - Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees

Role Description This role is responsible for leading the planning and execution of complex, highly regulated engineering projects from baseline definition through delivery, with full accountability for scope, schedule, cost, and technical outcomes. The position develops and maintains the integrated project baseline (budget, schedule, execution and risk plans, and all contractually required deliverables) and ensures that all governing documents align with corporate processes, quality requirements, and regulatory obligations. - Coordinates inputs and performance commitments from matrixed functions (Finance, Subcontracts/Procurement, Engineering, Licensing, Quality/Safety, and others). - Manages subcontractor and partner performance. - Makes key make/buy, subcontracting, and technical/programmatic decisions needed to achieve contract goals. - Accountable for ongoing project performance management, including risk management, schedule and cost adherence (variance and earned value analysis), document and deliverable status, and technical performance against specifications. - Defines and communicates deliverable acceptance criteria. - Determines the acceptability of deliverables and systems against performance, quality, safety, and operational requirements. - Drives corrective actions where needed. - Operates within nuclear or similarly stringent QA and regulatory frameworks. - Models professional conduct and actively supports the safety culture. - Integrates quality into all relevant processes while performing other duties as assigned. Qualifications - Bachelor's degree required. - Typically, ten plus years’ experience as an engineer and/or engineering manager in the energy/nuclear/petrochemical or high-technology hardware or software system development industry. - Experience in end-to-end complex system development, from concept to qualified hardware/system delivery. - Development experience in nuclear-safety systems, nuclear construction, operations, and/or maintenance. - Experience as a technical lead, proposal manager, or pursuit lead. - Experience working under nuclear regulatory codes or another strict QA program (e.g., NQA-1, N299, ISO-9001). Requirements - Project Management experience. - PMP certification. Benefits - 401K plan with an employer match. - Medical/Dental/Vision Insurance. - Life and Disability Insurance. - Paid Time Off. - Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees. Location - Rockville, MD Work Site Expectations - Remote eligible. Travel Expectations - 5%, as needed. Hours - Standard office hours are Monday - Friday, 8:00am EST to 5:00pm EST. Compensation The salary range for this position is: $155,000 - $180,000. Position Job Classification - Full time - Exempt.

• Serve as the senior integration lead for Main Power Systems • Lead cross-organizational business reviews, planning sessions, and decision forums • Develop multi-year program baselines, long-range resource plans, and annual Estimate at Completion (EAC) strategies • Oversee Earned Value Management System (EVMS) planning and performance measurement • Direct financial execution tracking across all cost elements including labor, subcontracts, vendor agreements, and capital equipment • Lead monthly financial close coordination, variance analysis, and strategic financial reporting • Provide senior-level oversight of procurement execution, vendor performance, and contracting integration • Lead development of advanced tools, workflows, templates, and business processes • Maintain and enhance WBS structures, control account documentation, and program interfaces

Title: Nuclear Engineer IV Location: Rockville, MD time type Full time job requisition id R101095 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 performing engineering tasks associated with designing, developing, and conducting analyses of a nuclear reactor or nuclear facility. Job Profile Tasks/Responsibilities - Perform design, analysis, and evaluation in assigned projects using sound engineering principles and adhering to business standards, practices, procedures, and product / program requirements. - 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. - 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. - Perform other duties as assigned by manager. Job Profile Minimum Qualifications - 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 design and analysis. - Nuclear fuel analysis and qualification. - Criticality safety. - Reactor multiphysics analysis, especially pertaining to transient analysis. - Nuclear materials and chemistry. - Nuclear analysis software development, verification and validation. - Other areas of nuclear engineering or nuclear physics relevant to the design and analysis of small modular reactors, microreactors, and nuclear facilities. Location: 530 Gaither Road, Rockville, MD Work Site Expectations: 4 days in office, 1 day remote Travel Expectations: 10% (as needed for project assignment) Hours: Standard office hours are 8:00am ET to 5:00pm ET, Monday -Friday Compensation As required by Maryland and other applicable state law, X Energy, LLC (X-energy) lists the expected compensation range for a publicly advertised job opportunity based upon the job requirements (e.g. education/training, experience, skill sets, etc.). Individual candidates who meet the job requirements for the posted position will be offered a salary within this range based on their respective levels of education/training, experience, and other qualifications unique to them. Salary ranges may vary based on the specific office location and region referenced in the posting to take into consideration differences in cost of living and may not be reflective of all regions. Please note that compensation ranges listed for US job postings reflect base salary only and do not include benefits or other incentives. Offers within the posted salary range are commensurate with the individual’s qualifications for the position, along with a view on internal equity, market data, and room for growth. The salary range for this position is: $158,000- $183,000 Position Job Classification Full time - Exempt Benefits X Energy, LLC offers a robust benefits package that includes a 401K plan with an employer match, Medical/Dental /Vision Insurance, Life and Disability Insurance, Paid Time Off, and a Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees. An Equal Opportunity Employer.  All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

• Execute the advanced threat hunt operations using known adversary tactics, techniques, and procedures as well as indicators of attack to detect adversaries. • Develop threat intelligence to detect, respond, and defeat advanced persistent threats (APTs). • Develop and produce reports on all activities and incidents to help maintain day-to-day status, develop, and report on trends, and provide focus and situational awareness on all issues. • Identify and remediate control weaknesses. • Review data with firewall administrators, engineering, system administrators, and other appropriate groups to determine the risk of security events. • Perform complex (senior-level) information security analysis work. • Develop and recommend plans to safeguard computer/server/network configurations and data files against accidental or unauthorized modification, destruction, or disclosure and to meet emergency data processing needs. • Execute the performance and review of technical risk assessments and new and existing applications. • Develop and implement systems and procedures to prevent, detect, contain, and correct data security breaches. • Maintain professional demeanor and behavior at all times in all forms of communication. • Perform other duties as assigned by manager.

Role Description This position is responsible for subcontract and procurement services that will support X-energy's business effort. They will lead the entire life cycle of small, moderate, and large-sized subcontracts, including: - Working with customers and suppliers - Identifying sources to meet X-energy's specific needs - Negotiating terms and conditions - Subcontract administration This role will supervise Subcontract Administrators of varying degrees of seniority and provide management, oversight, and guidance as appropriate to ensure compliance with company policies and procedures and achieve the company’s procurement goals/needs. Qualifications - Bachelor’s degree in business administration or related field from an accredited university or college. - Typically, seven plus years’ experience in procurement/contracts administration or related industry experience. - Previous experience at X-energy exceeding performance standards may be in lieu of years of experience. - Experience with federal government commercial procurements is required. - Understanding of federal government regulatory guidelines. - Experience conducting advanced level price and complex terms and conditions negotiations. - Proficient using Microsoft Office Applications, specifically Word and Excel. - Proficient using Deltek Costpoint Procurement Module. - Experience handling highly confidential and sensitive information. Requirements - Prepare, review, and negotiate standard contract agreements and documents, including teaming, non-disclosure, subcontracts, Purchase Orders, and other vendor agreements. - Provide guidance and support to subcontract administrators and ensure compliance with company policies and procedures. - Approve timesheets and paid time off requests. - Identify distinct contract requirements, provisions, and terms and conditions for subcontractors and vendors for U.S., Canada, and U.K. - Initiate documentation to authorize and direct work in accordance with contractual requirements. - Generate and negotiate change orders and modifications to NDAs, Teaming Agreements, Professional Services Agreements, and Subcontract Agreements. - Resolve issues with customers, subcontractors, vendors, and leadership as needed. - Prepare and disseminate information regarding subcontract status, funding, compliance, modification, deviation, negotiation, and termination. - Conduct proper due diligence for all procurement requests, including vetting potential vendors and subcontractors. - Maintain approved vendor list through verification that vendors are not excluded in SAM.gov. - Support company proposal efforts as necessary. - Maintain and follow procurement and Quality Assurance policies and procedures for U.S., Canada, and U.K. - Ensure all procurement files are compliant with DCAA, CPSR, and Prime Contract requirements. - Maintain all documents, reviews, awards, and subcontracts in an organized, detailed, and centralized filing system. - Uphold open lines of communication with program managers, finance, leadership, and customers. - Maintain professional demeanor and behavior at all times in all forms of communication. - Perform other duties as assigned by manager. Benefits - 401K plan with an employer match - Medical/Dental/Vision Insurance - Life and Disability Insurance - Paid Time Off - Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees.

Role Description X-energy LLC is hiring a Supply Chain Data & Analytics Lead to join its team. The Supply Chain Data & Analytics Lead drives operational excellence through data-driven insights and strategic reporting infrastructure. This role has a dual mandate: - Analyze current procurement data to identify and resolve bottlenecks impacting PO cycle time, enabling immediate process improvements. - Design and implement the reporting architecture for Ariba that will support long-term performance optimization. The ideal candidate combines analytical rigor with business acumen to transform raw data into actionable intelligence that accelerates X-energy's supply chain performance. Qualifications - Bachelor's degree in Data Analytics, Business Analytics, Supply Chain Management, Industrial Engineering, or related field. - 7+ years of relevant experience. - 4-6 years of experience in procurement analytics, supply chain analytics, or business intelligence. - Strong proficiency in data analysis and visualization tools (Excel, Power BI, Tableau, SQL). - Demonstrated ability to extract insights from complex datasets and communicate findings to non-technical audiences. - Experience with supply chain processes and procurement KPIs (cycle time, maverick spend, supplier performance, etc.). - Proficiency in statistical analysis tools (R, Python) or advanced analytics techniques. - Knowledge of data governance principles and best practices. - Strong business acumen with the ability to connect data insights to operational outcomes. Requirements - Experience with SAP Ariba reporting and analytics modules (preferred). - Advanced degree (Master's) in Analytics, Data Science, Supply Chain, or related field (preferred). - Experience in manufacturing, construction, or project-based industries (preferred). - Familiarity with ERP systems (SAP, Oracle) and procurement system integrations (preferred). - Certification in data analytics, business intelligence, or supply chain management (CSCP, CPSM) (preferred). Benefits - 401K plan with an employer match. - Medical/Dental/Vision Insurance. - Life and Disability Insurance. - Paid Time Off. - Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees. Success Metrics - Identify and quantify top 5 bottlenecks in current PO cycle time within first 60 days. - Deliver measurable reduction in average PO cycle time through data-driven interventions. - Successfully implement Ariba reporting infrastructure ready for day-one go-live. - Achieve 95%+ data quality score in Ariba post go-live. - Deliver monthly executive scorecards with actionable insights driving continuous improvement. Location 530 Gaither Road, Rockville, MD 20850 Work Site Expectations Remote Travel Expectations Up to 10% as needed Hours 8:00am-5:00pm, Mon-Fri Compensation The salary range for this position is: $95,000 - $136,000 Position Job Classification Full time - Exempt

• Responsible for the network and on-premises virtual infrastructure development, security, and operations • Integrate network/computer/storage management system for Cloud Service Providers and on-premises Infrastructure-as-a-Service (IaaS) solutions into full-lifecycle operational service delivery and project management platforms • Design and deploy hardened and compliant office and enterprise Network Infrastructure supporting multi-tenant, virtualized and/or High-Performance Computing production environments • Develop and maintain security, availability, performance, and scalability, continuous improvement, and monitoring for highly available and redundant network and virtual infrastructure • Take ownership of project requirement development, deployment, and operational release management

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 ensuring payroll is processed on time, accurately, and in compliance with government regulations. The position entails excellent time management skills to ensure all daily and monthly deadlines are met. Job Profile Tasks/Responsibilities - Process multi-state and international bi-weekly payroll for 400+ employees. - Ensure adherence to company’s guidelines and policies. - Coordinate with HR benefits team to ensure benefit deductions are correct. - Accurately set up garnishments. - Timesheet Administrator for Deltek Timekeeping system, ensuring timesheets are processed in a timely manner. - Coordinate across team members and various internal departments to address time administration, labor processing, and payroll related tasks. - Research and resolve payroll problems and processing errors; partner with HR personnel to ensure timely resolution of employee payroll issues/inquiries. - Conduct training for existing and new employees and managers on the timekeeping system. - Responds to States and Unemployment accounts set up and resolving issues. - Provide support on all payroll matters as needed. - Assists A/P with billing and invoice processing. - Assists Accounting team on payroll related inquiries/issues. - Maintain professional demeanor and behavior at all times in all forms of communication. - Perform other duties as assigned by manager. Job Profile Minimum Qualifications - Associate’s degree required. - Typically, 15 years of relevant experience required. - Proficient in multi-state and international payroll preparation and all related duties such as processing timesheets, maintaining payroll records, inputting new hire information, year-end processing, payroll related accounts reconciliation. - Experience with international payroll. - Demonstrated experience as a payroll specialist in a government contracting environment. - Demonstrated experience working with Deltek T&E system and ADP Workforce System. Location: Remote Travel Expectations: 5% Hours: Standard office hours are 8:00am EST to 5:00pm EST, Monday -Friday Compensation As required by Maryland and other applicable state law, X Energy, LLC (X-energy) lists the expected compensation range for a publicly advertised job opportunity based upon the job requirements (e.g. education/training, experience, skill sets, etc.). Individual candidates who meet the job requirements for the posted position will be offered a salary within this range based on their respective levels of education/training, experience, and other qualifications unique to them. Salary ranges may vary based on the specific office location and region referenced in the posting to take into consideration differences in cost of living and may not be reflective of all regions. Please note that compensation ranges listed for US job postings reflect base salary only and do not include benefits or other incentives. A reasonable estimate for this position at the level of experience required is: $41.32 - $68.87/ hr Position Job Classification Full time - Non-Exempt Benefits X Energy, LLC offers a robust benefits package that includes a 401K plan with an employer match, Medical/Dental /Vision Insurance, Life and Disability Insurance, Paid Time Off, and a Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees. An Equal Opportunity Employer.  All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability. X Energy, LLC participates in E-Verify. Please visit the links below for more information about E-Verify and the protection of your Right to Work. Right To Work Link: If you have the right to work, don't let anyone take it away (e-verify.gov) E-Verify Participation Link: E-Verify Participation Poster English and Spanish

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 all steps in the accounts payable (AP) process on time, accurately, and in compliance with government regulations and company policies. Job Profile Tasks/Responsibilities - Support the full cycle AP process including entering invoices into the accounting system, posting vouchers, issuing checks and generating ACH payments. - Manage the AP invoicing mailbox ensuring timely and accurate payments to vendor and employees. - Route and track invoices for electronic signatures and approvals. - Maintain AP records and associated filing systems; enters data into computer systems; updates and reconciles accounts, compiles documentation, and generates reports. - Respond to vendor inquiries in a timely manner, reconcile vendor statements, research, and correct discrepancies. - Retrieve documents to support customer invoicing, audit, and research. - Assist in standardizing procedures to generate efficiency. - Perform the pay cycles to generate payments for corporate suppliers, employee reimbursements and subsidiary client refunds. - Incumbent transmits cash forecasting and remittance advices for electronic payments. - Provide data entry, accounting support and communicating with company vendors in terms of invoice processing and payment. - Support sales and use tax filings. - Maintain communication with internal parties both in the Accounting Department and with other departments. - Match and enter all Purchase Order invoices from inventory and non-inventory vendors, research and resolve all quantity and price variances with urgency and maintain excellent communication with the vendor. - Maintain professional demeanor and behavior at all times in all forms of communication. - Execute the core tasks and responsibilities, listed in the Job Profile Task/Responsibilities section of this document, with minimal supervision. - Perform other duties as assigned by manager. Job Profile Minimum Qualifications - High school diploma is required. - Typically, five years of experience in a relevant role required. - Experience using Microsoft Office applications (i.e. Word, Excel, Outlook). - Some knowledge of accounts payable principles and practices. Location: Remote Travel Expectations: 5% Hours: Standard office hours are 8:00am ET to 5:00pm ET, Monday -Friday Compensation As required by Maryland and other applicable state law, X Energy, LLC (X-energy) lists the expected compensation range for a publicly advertised job opportunity based upon the job requirements (e.g. education/training, experience, skill sets, etc.). Individual candidates who meet the job requirements for the posted position will be offered a salary within this range based on their respective levels of education/training, experience, and other qualifications unique to them. Salary ranges may vary based on the specific office location and region referenced in the posting to take into consideration differences in cost of living and may not be reflective of all regions. Please note that compensation ranges listed for US job postings reflect base salary only and do not include benefits or other incentives. A reasonable estimate for this position at the level of experience required is: $30.68- $51.14/hr Position Job Classification Full time - Non-Exempt Benefits X Energy, LLC offers a robust benefits package that includes a 401K plan with an employer match, Medical/Dental /Vision Insurance, Life and Disability Insurance, Paid Time Off, and a Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees. An Equal Opportunity Employer.  All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability. X Energy, LLC participates in E-Verify. Please visit the links below for more information about E-Verify and the protection of your Right to Work. Right To Work Link: If you have the right to work, don't let anyone take it away (e-verify.gov) E-Verify Participation Link: E-Verify Participation Poster English and Spanish