Principal R&D Scientist

X-Ray Expert Position Onto Innovation is a leader in process control, combining global scale with an expanded portfolio of leading-edge technologies that include: 3D metrology spanning the chip from nanometer-scale transistors to micron-level die-interconnects; macro defect inspection of wafers and packages; metal interconnect composition; factory analytics; and lithography for advanced semiconductor packaging. Our breadth of offerings across the entire semiconductor value chain helps our customers solve their most difficult yield, device performance, quality, and reliability issues. Onto Innovation strives to optimize customers' critical path of progress by making them smarter, faster and more efficient. Job Summary We are seeking a highly motivated X-Ray expert to conduct advanced X-Ray research supporting the development of next-generation metrology solutions for semiconductor manufacturing. The scientist will perform X-Ray experiments, collect and analyze measurement data, develop theoretical models, and create physics-based and machine learning algorithms for microelectronics and advanced-material characterization. Key Responsibilities Data collection and Hardware management Data Analysis and Algorithm Development Documentation and Stakeholder Collaboration Qualifications Ph.D. in physics, applied physics, materials science, chemical engineering, or a closely related technical field with a strong academic background in X-Ray science. Deep understanding of the physics and instrumentation of advanced X-Ray techniques, with hands-on experience in data analysis for CD-SAXS, XRD, XRR, or XRF. Experience conducting X-Ray experiments at a synchrotron, national laboratory, or comparable advanced research facility. Experience optimizing experimental methods for throughput, sensitivity, precision, and signal-to-noise performance. Experience with rigorous electromagnetic modeling, scattering theory, computational physics, or related simulation techniques. Familiarity with X-Ray hardware configurations and incorporating system non-idealities into theoretical simulations. Experience developing analytical or numerical methods for inverse-problem solving, optimization, parameter estimation, signal processing, and statistical inference. Familiarity with uncertainty quantification, error-budget development, Gauge R&R, measurement-system analysis, and metrology validation. Demonstrated experience using Python, MATLAB, JMP, or comparable scientific-computing and statistical-analysis tools. Experience developing machine learning or AI methods for scientific data analysis, physical-system modeling, parameter extraction, or inverse problems. Knowledge of semiconductor devices, thin films, nanoscale structures, microelectronics manufacturing, or advanced materials is a plus. Evidence of research impact through publications, conference presentations, patents, technical reports, or successful technology transfer. Excellent communication skills and ability to present technical materials both to working-level peers and to senior management internally and externally. Ability to work independently while collaborating effectively with multidisciplinary and geographically distributed stakeholders. Ability to travel up to 25%. Success Attributes A rigorous, data-driven approach to technical problem solving. Strong scientific curiosity and self-motivation, and persistence when working through complex experiments, iterative modeling, and detailed data validation. Attention to data quality, reproducibility, uncertainty, and documentation. Ability to integrate experimental observations, physical understanding, and computational methods. Willingness to perform both innovative algorithm development and conventional data analysis methods required to achieve optimal measurement performance. Clear communication and effective collaboration with research, engineering, and business stakeholders. Why Join Onto Innovation? At Onto Innovation, we believe your work should matter—and so should your well-being. That's why we offer competitive salaries and a comprehensive benefits package designed to support you and your family. From health, dental, and vision coverage to life and disability insurance, PTO, and a 401(k) with employer match, we've got you covered. You'll also enjoy access to our Employee Stock Purchase Program (ESPP), wellness initiatives, and cutting-edge tools—all within a collaborative, inclusive culture where your contributions are valued and recognized. Compensation & Growth • Base Salary Range: $160,000.00 - $240,000.00, offered in good faith and based on experience, location, and qualifications. Additional Rewards: Annual bonus opportunities and potential long-term incentives tied to both company and individual success. Empowering Every Voice to Shape the Future: Onto Innovation is committed to creating a workplace where every qualified candidate has an equal opportunity to succeed. We evaluate applicants based on skills, experience, and potential - without regard to race, color, religion, gender, sexual orientation, national origin, age, disability, veteran status, or any other characteristic protected by law. We believe diversity of thought and background drives innovation and strengthens our team. Important Note on Export Compliance For certain positions requiring access to technical data, U.S. export licensing review may be necessary for applicants who are not U.S. Citizens, Permanent Residents, or other protected persons under 8 U.S.C. 1324b(a)(3). Onto Innovation