Staff Mechanical Engineer

Onto Innovation Inc.; Milpitas (CA); On-site; USD 144,000 - 216,000; Full time

Job summary

Onto Innovation is seeking a Staff Mechanical Engineer in Milpitas to lead precision motion control design for semiconductor capital equipment. You will apply dynamics-informed design, develop servo loops, stage control architectures, and integrate high-resolution feedback systems.

You will collaborate across controls, electrical, and software teams to translate system requirements into robust mechanical and control solutions, while supporting manufacturing and field improvements and traveling

Qualifications

• 7+ years of experience in precision mechanical/mechatronic systems.
• Strong fundamentals in control systems, dynamics and vibration analysis.
• Experience with servo tuning tools and motion controllers.
• Familiarity with semiconductor equipment or similar high-precision motion systems.
• Willing to travel internationally up to 20%.
• Knowledge of SEMI, CE, UL compliance.

Responsibilities

• Apply 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.
• Develop and support motion control systems including: Servo loop design, tuning, and optimization; Stage control architectures; Integration of encoders and high-resolution feedback systems.
• Perform dynamic system analysis including: Modal analysis and frequency response; Vibration characterization and mitigation; Identification and mitigation of structural resonances.
• Collaborate cross-functionally with controls, electrical, and software teams to define architectures and interfaces and translate system requirements into control specifications.
• Provide technical support to manufacturing, service, and customers for motion performance issues and field improvements.

Skills

Control systems

Structural dynamics

System identification

Servo tuning

Multi-axis motion

FEA tools

Encoders feedback

Education

BS/MS/PhD in Mechanical Engineering

Tools

FEA software

Motion controllers

Sensors/encoders

Job description

## Staff Mechanical EngineerApplylocations: Milpitas-CAtime type: Full timeposted on: Posted Todayjob requisition id: R-6117Onto 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 & Responsibilities*** Apply 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 systems* Perform dynamic system analysis including: + Modal analysis and frequency response (Bode/Nyquist) + Vibration characterization and mitigation aligned to VC standards + Identification and mitigation of structural resonances impacting control bandwidth and stability* Conduct 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 drift* Define and validate control performance requirements, including: + Positioning accuracy, repeatability, settling time, and throughput + Stability margins and robustness to disturbances + System-level error budgeting (mechanical + control contributions)* Participate in system integration and commissioning, including: + Servo tuning and optimization on hardware + Prototype bring-up, system identification, and parameter extraction + Debugging control instabilities, noise, and cross-axis coupling* Support system-level characterization and validation: + Frequency response measurement (FRF), step response, tracking performance + Vibration sensitivity and environmental coupling + Compliance with SEMI and other performance standards* Collaborate cross-functionally with controls, electrical, and software teams to: + Define control architectures and interfaces + Translate system requirements into control specifications + Ensure alignment between mechanical design and control performance* Support 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.**Qualifications*** Controls-Relevant Qualifications* BS/MS/PhD in Mechanical Engineering or related field with strong emphasis on dynamics, controls, or mechatronics* 7+ years of experience in precision mechanical/mechatronic systems with hands-on motion control and servo tuning experience* Strong fundamentals in: + Control systems engineering (feedback control, stability, loop shaping) + Structural dynamics and vibration analysis + System identification and frequency-domain analysis* Experience with: + Servo tuning tools and motion controllers + Multi-axis stage systems and precision motion platforms + Sensors and feedback systems (encoders, interferometers, capacitive sensors)* Proficiency in: + FEA tools for dynamic and thermal modeling + Troubleshooting complex system-level performance issues* Familiarity with semiconductor equipment or similar high-precision, high-bandwidth motion systems* Understanding of compliance standards (SEMI, CE, UL) with respect to system performance and safety* Strong ability to: + Diagnose and resolve control-performance limitations (mechanical vs control root cause) + Work at system level across mechanical, electrical, and software domains + Communicate complex control concepts clearly to cross-functional teams* Must 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).