Staff Mechanical Engineer

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 & ResponsibilitiesApply the Onto Innovation product development process from concept through manufacturing release, with strong emphasis on control system architecture, integration, and validation for precision semiconductor capital equipment.Lead mechanical and mechatronic design with a focus on dynamics-informed design to enable high-performance motion control (stiffness, damping, eigenfrequency management, thermal stability).Develop and support motion control systems including:Servo loop design, tuning, and optimization (PID, feedforward, notch filtering)Stage control architectures (single-axis, multi-axis, coordinated motion)Integration of encoders, interferometers, and high-resolution feedback systemsPerform dynamic system analysis including:Modal analysis and frequency response (Bode/Nyquist)Vibration characterization and mitigation aligned to VC standardsIdentification and mitigation of structural resonances impacting control bandwidth and stabilityConduct controls-driven design analysis, including:Tolerance stack-up with impact on control performance (following error, settling time)FEA with focus on dynamic behavior (mode shapes, compliance paths)Thermal-mechanical interactions affecting control accuracy and driftDefine and validate control performance requirements, including:Positioning accuracy, repeatability, settling time, and throughputStability margins and robustness to disturbancesSystem-level error budgeting (mechanical + control contributions)Participate in system integration and commissioning, including:Servo tuning and optimization on hardwarePrototype bring-up, system identification, and parameter extractionDebugging control instabilities, noise, and cross-axis couplingSupport system-level characterization and validation:Frequency response measurement (FRF), step response, tracking performanceVibration sensitivity and environmental couplingCompliance with SEMI and other performance standardsCollaborate cross-functionally with controls, electrical, and software teams to:Define control architectures and interfacesTranslate system requirements into control specificationsEnsure alignment between mechanical design and control performanceSupport multiple programs by delivering controls-aware designs that meet schedule, cost, and performance targets.Provide technical support to manufacturing, service, and customers for motion performance issues, root cause analysis, and field improvements.QualificationsControls-Relevant QualificationsBS/MS/PhD in Mechanical Engineering or related field with strong emphasis on dynamics, controls, or mechatronics7+ years of experience in precision mechanical/mechatronic systems with hands-on motion control and servo tuning experienceStrong fundamentals in:Control systems engineering (feedback control, stability, loop shaping)Structural dynamics and vibration analysisSystem identification and frequency-domain analysisExperience with:Servo tuning tools and motion controllersMulti-axis stage systems and precision motion platformsSensors and feedback systems (encoders, interferometers, capacitive sensors)Proficiency in:FEA tools for dynamic and thermal modelingTroubleshooting complex system-level performance issuesFamiliarity with semiconductor equipment or similar high-precision, high-bandwidth motion systemsUnderstanding of compliance standards (SEMI, CE, UL) with respect to system performance and safetyStrong ability to:Diagnose and resolve control-performance limitations (mechanical vs control root cause)Work at system level across mechanical, electrical, and software domainsCommunicate complex control concepts clearly to cross-functional teamsMust be able to travel internationally to customer sites at least 20% of the time, with additional travel as business needs require.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:$144,000.00 - $216,000.00, 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 ComplianceFor 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).SummaryLocation: Milpitas-CAType: Full time