We are seeking a Nuclear Facility Mechanical Project Engineer to provide engineering design solutions for new construction, upgrades to facility mechanical systems (i.e., ventilation, fire suppression, compressed gas, chillers, boilers), and modifications to conventional office and laboratory facilities. You will apply technical knowledge in mechanical engineering to develop conceptual ideas into workable and cost-effective solutions that maintain facilities supporting research and investigations of nuclear materials. You will participate in new and ongoing projects with technical responsibilities including design, development, fabrication, integration, testing and fielding of facility projects and upgrades. This position will report programmatically to the Facility Projects Capabilities Manager in the Superblock. This position is in the Defense Technologies Engineering Division (DTED) within the Engineering Directorate. This position requires full-time on-site presence due to the nature of the work. This position will be filled at either the SES.2 or SES.3 level depending on your qualifications. Additional job responsibilities (outlined below) will be assigned if you are selected at the higher level. You will  Independently prepare and influence moderately complex mechanical designs that require in-depth analysis, ingenuity, and creativity by utilizing design criteria, calculations, schematics, sketches, construction documents, procedures, and specifications. Utilize technical engineering skills and moderately complex mechanical system experience to develop detailed designs, drawings, calculations, bills of materials, budgets, presentations, schedules, and work planning documentation to support facility improvement projects and activities, including evaluating system capacities, planning sequencing of work, and ensuring constructability. Support significant R&D projects by applying comprehensive knowledge, skills, and innovation to create mechanical solutions that are safe and compliant with DOE orders and specifications and LLNL procedures and work control system processes. Determine functional requirements for mechanical systems in a hazard category 2 nuclear facility for new or modified specialized equipment and support systems and perform advanced engineering calculations. Write and communicate clear concise requirements using in-depth analysis and/or ingenuity. Participate in design reviews to obtain approvals of project scope and designs. Provide technical input to others on moderately complex design requirements and identify and evaluate potential system impacts for projects affecting facility systems while complying with LLNL procedures, work control system processes, and DOE requirements. Guide the successful completion of projects, provide regular status updates to stakeholders, and recognize when to develop and initiate workarounds to project obstacles. Provide engineering support during construction performed by outside contractors including reviewing submittals and shop drawings, responding to contractor questions, evaluating change order requests, or resolving field problems. Generate detailed plans, schedules, and budgets for project activities. Perform other duties as assigned. Additional job responsibilities, at the SES.3 level  Lead highly complex internal multi-disciplinary engineering projects as the Project Lead or Design Manager with overall responsibility for developing technical criteria, budgets, schedules, and deliverables. Develop, implement, and provide highly advanced engineering solutions and technical analysis to resolve highly complex technical issues. Provide project planning and project management knowledge and skills for significant R&D projects, while also applying high level expertise and innovation to create mechanical solutions that are safe and compliant with DOE orders and specifications. Lead complex internal system projects with responsibility for the development of and compliance with technical criteria, schedules, and deliverables, and direct the work of design drafters preparing drawings. Collaborate with senior stakeholders, management, and DOE personnel in management and execution of the portfolio of facility projects, serving as the primary technical resource, and influencing and providing strategic technical advice. Participate in the planning development, implementation, and refinement of broad project vision and strategy and influence technical direction for the projects and the team to drive successful outcomes for deliverables. Contribute to new ideas, modify approaches, and/or redefine customer requirements that impact organizational operations or directions. Provide advanced level capability in the design and analysis of highly complex mechanical systems.