[Skip to main content](#main-content) [OpenNash Jobs](https://jobs.opennash.com/) [Hiring report](/reports/hiring/) · [All Coherent jobs](https://jobs.opennash.com/companies/coherent/) · [Search jobs](/search/) Coherent · Fremont, CA # Principal Foundry Quality Engineer Fremont, CA, United States On-site Senior individual contributor Manufacturing & Production Listed on Coherent’s official careers site. Posted October 5, 2026. Check that it is still open and apply there. [Apply on Coherent’s careers site →](https://hcwp.fa.us2.oraclecloud.com/hcmUI/CandidateExperience/en/sites/CX_1/job/2015113) [OpenNash Jobs](https://jobs.opennash.com/) / [Coherent](https://jobs.opennash.com/companies/coherent/) / Principal Foundry Quality Engineer ## Job description ### Primary Duties & Responsibilities Lead the development of predictive quality methodologies that align supplier PCM data with Coherent device designs, wafer-level test results, reliability performance, and factory yields. Identify yield and performance issues not detected by foundry PCM monitoring and partner with foundries to implement enhanced test structures, monitoring strategies, and process controls that improve correlation and early detection of manufacturing risks. Partner with internal engineering teams and external wafer foundries to develop and implement comprehensive foundry quality processes and procedures for Coherent Silicon Photonic PIC Products. Utilize Quality Metrics and KPIs from die testing and transceiver assembly/test sites to derive predictive quality metrics (e.g. defect density, yield, escapes, corrective action effectiveness) and drive preventive measures internally and from the PIC foundries. Participate in the Materials Review Board with factory quality and engineering partners to disposition discrepant material and document routine troubleshooting process flows for improved efficiency. Apply AI and big data techniques to analyze foundry quality data, predict trends, and recommend corrective actions. Perform quality and process audits of new and existing foundries to assess compliance to industry standards and assess product quality and reliability risk. Lead root cause investigations and collaborate with process integration, device engineering, reliability, and foundry teams to implement corrective actions, drive specification changes, resolve process issues, and manage material disposition through the CCB process. Participate in new product design for quality and reliability (DfQnR) reviews and Failure Mode Effects and Analysis (FMEA). Support PIC qualification activities for new PIC products, foundry qualifications, and ongoing improvements. ### Education & Experience BS/MS/PhD in Material Science, Physics, Electrical Engineering, or equivalent field. 5+ years of experience in CMOS or Silicon Photonics foundry process technology development, foundry technology interface, or related fields and technology nodes. ### Skills Strong interpersonal, teaming, and problem-solving skills. Work effectively with other members of Coherent Corp within the US and Asia counterparts. Excellent communication skills and ability to influence individuals with diverse backgrounds. Proficiency in Semiconductor Device Physics and Defect Mechanism analysis. - Proficiency in analytical tools for data analysis and MS Office - Familiarity with optical device manufacturing preferred, including: Lasers Modulators Photodetectors Optical switches Co-packaged optics Optical transceivers ### Working Conditions - Ability to travel domestically and internationally as required. 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 the site EHS procedures and Coherent Corp. 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. ## At a glance - Posted by the employer: Oct 5, 2026 - First seen by OpenNash: Oct 11, 2026 - Last checked: Oct 18, 2026 - Listed for: 13 days - Location: Fremont, CA, United States - Work arrangement: On-site[Apply on Coherent’s careers site →](https://hcwp.fa.us2.oraclecloud.com/hcmUI/CandidateExperience/en/sites/CX_1/job/2015113) ## More jobs at Coherent ### [Lead Reliability & Customer Quality Engineer](https://jobs.opennash.com/companies/coherent/jobs/dfffeb9b615ba48e9d17/) Fremont, CA, United States ### [Senior Assembly Development Engineer](https://jobs.opennash.com/companies/coherent/jobs/e470698968c0097c9511/) Fremont, CA, United States ### [Director of Indium Phosphide (InP) Wafer Fab Operations](https://jobs.opennash.com/companies/coherent/jobs/1238dd464117f9925404/) Fremont, CA, United States ### [Director, Product Management](https://jobs.opennash.com/companies/coherent/jobs/6c3ad5dc5b2d52a42691/) Fremont, CA, United States ## Similar jobs at other companies ### [Principal Software Engineer - CoreAI (Foundry Observability)](https://jobs.opennash.com/companies/microsoft/jobs/5bb71416b2ef5139f80c/) Microsoft · United States, Washington, Redmond ### [Principal Quality Engineer - Program Quality](https://jobs.opennash.com/companies/bae-systems/jobs/6859a98ca965a70c31cd/) BAE Systems · Maple Grove, Minnesota, United States ### [Principal Quality Engineer – Design & Operations Quality](https://jobs.opennash.com/companies/bae-systems/jobs/4a65b5bcdbcdbf60b5aa/) BAE Systems · Maple Grove, Minnesota, United States ### [Program Quality Engineer Principal - E6](https://jobs.opennash.com/companies/lockheed-martin/jobs/bfc9fe42607a166a0d2b/) Lockheed Martin · Fort Worth, TX OpenNash lists jobs from employers’ own careers sites and does not handle applications. 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