Principal Quality Engineer-Optical Systems
Coherent
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Sunnyvale, CA · Posted August 19, 2026
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Where Sunnyvale, CA ranks
Where Sunnyvale, CA placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #1Best cities for consumer and retail pay after cost of living$194k · of 11
- #3Best cities for data and analytics pay after cost of living$213k · of 28
- #4Best cities for pay after cost of living in California$192k · of 32
- #4Best all-round cities for AI careers95 / 100 · of 100
- #4Best all-round cities for AI careers in the West Coast88 / 100 · of 39
- #5Best cities for pay after cost of living in the West Coast$192k · of 39
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
How AI is used in this kind of work
AI use among engineers, all other is little observed so far. Measured exposure for engineers, all other: 7% (little observed).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
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About the job
Primary Duties & Responsibilities
Partner with cross-functional teams including optical design, mechanical engineering, manufacturing, process engineering, and suppliers to ensure quality is built into product and process development.
Lead structured root cause investigations using methodologies such as 8D, DMAIC, Fishbone, and 5-Why to resolve internal and customer-facing quality issues.
Drive corrective and preventive actions (CAPA) to closure and verify effectiveness through data-based validation and follow-up.
Develop and maintain quality plans, control plans, inspection strategies, and process documentation for optical systems and assemblies.
Implement and monitor yield metrics, and other quality indicators to reduce variation and improve product performance.
Conduct and support internal audits to ensure compliance with ISO 9001 and other applicable quality management standards.
Collaborate with suppliers to evaluate process capability, manage nonconformances, and improve overall supply chain quality performance.
Support new product introduction (NPI) and production ramp activities, ensuring process readiness, risk mitigation, and manufacturing scalability.
Drive continuous improvement initiatives using Lean and Six Sigma principles within a technical manufacturing environment.
Prepare and present quality performance reports, audit findings, and improvement plans to leadership and key stakeholders.
Education & Experience
M.S. or higher in Electrical Engineering, Optical Engineering, Mechanical Engineering, Materials Science, or related technical field.
Minimum 10 years of experience in quality engineering focused on optical systems, photonics devices, or optoelectronic assemblies.
Demonstrated experience supporting products through NPI and high-volume technical manufacturing environments.
Experience working in fast-paced or startup environments preferred.
Skills
Strong technical understanding of optical systems including lasers, transceivers, photonic components, packaging, and opto-mechanical assemblies.
Exceptional root cause investigation and failure analysis capabilities in complex technical manufacturing environments.
Experience conducting internal audits and supporting external audits within ISO-based quality management systems.
Proven track record in process improvement, yield enhancement, and implementation of quality systems and controls.
Hands-on experience working closely with manufacturing teams to resolve quality escapes and improve process robustness.
Ability to synthesize complex technical data into clear, actionable recommendations for cross-functional teams and leadership.
Strong communication skills and ability to work effectively across global teams and suppliers.
Self-driven, adaptable, and comfortable operating in ambiguous or rapidly evolving environments.
Working Conditions
Office environment with regular interaction in laboratory and manufacturing settings.
Occasional domestic and international travel to suppliers and manufacturing sites may be required.
Physical Requirements
Ability to work in laboratory and manufacturing environments, including extended periods of sitting, standing, and use of standard lab equipment.
Safety Requirements
All employees are required to follow site Environmental, Health, and Safety (EHS) procedures and Coherent corporate EHS standards.
Quality and Environmental Responsibilities
Depending on location, this position may be responsible for the execution and maintenance of the ISO 9000, 9001, 14001 and/or other applicable standards that may apply to the relevant roles and responsibilities within the Quality Management System and Environmental Management System.
Culture Commitment
Ensure adherence to company’s values (ICARE) in all aspects of your position at Coherent Corp.:
I ntegrity – Create an Environment of Trust
C ollaboration – Innovate Through the Sharing of Ideas
A ccountability – Own the Process and the Outcome
R espect – Recognize the Value in Everyone
E nthusiasm – Find a Sense of Purpose in Work
Coherent Corp. is an equal opportunity/affirmative action employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law.
If you need assistance or an accommodation due to a disability, you may contact us at talentacquisition@coherent.com .
Coherent is a global leader in lasers, engineered materials and networking components. We are a vertically integrated manufacturing company that develops innovative products for diversified applications in the industrial, optical communications, military, life sciences, semiconductor equipment, and consumer markets. Coherent provides a comprehensive career development platform within an environment that challenges employees to perform at their best, while rewarding excellence and hard-work through a competitive compensation program. It's an exciting opportunity to work for a company that offers stability, longevity and growth. Come Join Us!
Note to recruiters and employment agencies: We will not pay for unsolicited resumes from recruiters and employment agencies unless we have a signed agreement and have required assistance, in writing, for a specific opening.