We have multiple openings for experienced Optical Engineers. You will support optical systems design, modeling, analysis, and engineering for complex high energy laser systems, diagnostics, beam transport, and high-fidelity optical systems. This role requires balancing parallel tasks with broadly defined priorities while collaborating across scientists, engineers, technicians, and designers. This position is in the Optical Design and Engineering group within the Laser Systems Engineering and Operations (LSEO) Division, part of LLNL's Engineering Directorate supporting projects across the National Ignition Facility and Photon Science (NIF&PS) / Light Matter and Fusion (LMF) directorate. This position requires full-time on-site presence due to the nature of the work. This position will be filled at either level based on knowledge and related experience as assessed by the hiring team. Additional job responsibilities and qualifications (outlined below) will be assigned if hired at the higher level. In this role, you will Work under limited direction with moderate responsibility, use comprehensive knowledge, and exercise independent judgment to determine methods and recommend improvements within established frameworks and contribute to the fulfillment of project and organizational goals. Design and model moderately complex to complex optical systems such as high energy lasers, diagnostics, relay imaging systems, and beam transport systems in CODE V and FRED to inform design decisions and tradeoffs.  Design, analyze, and document optical component and system specifications, including performance, fabrication, inspection, and acceptance criteria.  Perform non-sequential, stray light, and ghost analysis and develop mitigation strategies for optical systems and subsystems. Perform tolerancing, error budgeting, and performance analyses for optical systems and subsystems. Define and derive assigned moderately complex to complex optical requirements from established physics and system-level performance requirements. Diagnose moderately complex to complex optical issues, develop practical solutions, and present technical results to multidisciplinary teams of scientists, engineers, technicians, and designers. Perform other duties as assigned. Additional job responsibilities, at the SES.3 level Function independently with minimal direction, taking significant responsibility and using advanced knowledge and judgment to establish objectives, prioritize parallel tasks, allocate resources, and collaborate in the development of innovative methods/technology to guide the completion of projects and contribute to the development of organizational goals. Lead conceptual and preliminary designs for complex optical systems and perform advanced physical optics simulations, optical tolerancing, and system parameter studies using FRED/Code V scripting and modeling. Provide technical leadership for optical design and engineering efforts, including fabrication and test strategy development, design reviews, and pursuit of solutions in situations that may not be well defined.