Product Engineer

Coherent Corp.; Sherman (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

Coherent Corp. in Sherman, CA, seeks an experienced Semiconductor Yield Engineer to own InP edge-emitting laser and photodiode yield and drive improvements. You will monitor trends, identify detractors, and collaborate across epitaxy, process, device design, test, manufacturing, quality, and reliability teams.

You will analyze test data, plan experiments, implement corrective actions, and verify sustained process stability while reporting findings through technical reviews.

Qualifications

• BS/MS in Electrical Engineering or related discipline; 4+ years in semiconductor product/engineer roles.
• Experience analyzing semiconductor device performance and yield loss with structured root cause analysis.
• Experience with III-V devices, InP lasers or photodiodes preferred.

Responsibilities

• Own product yield for InP edge-emitting lasers and photodiodes; monitor performance and drive yield improvements.
• Monitor trends across wafers, lots, and manufacturing stages to identify excursions and quality concerns.
• Analyze wafer- and die-level test data to prioritize improvement opportunities.
• Collaborate with epitaxy, process engineering, device design, test, manufacturing, quality, and reliability teams to investigate failures and establish root cause.
• Develop and implement corrective and preventive actions; verify effectiveness.
• Plan experiments to understand relationships between epitaxial properties, fabrication, and device performance.
• Support product characterization and evaluation of process changes to maintain performance and manufacturability.
• Communicate trends, findings, actions, and progress through clear technical reports.

Skills

Yield analysis

Root cause analysis

Statistical methods

Data scripting

Cross-functional teamwork

Communication

Semiconductor knowledge

Education

BS in Electrical Engineering

MS in Electrical Engineering or related

Tools

JMP/JSL

SQL

Python

Job description

Primary Duties & Responsibilities

• Own product yield for InP edge-emitting lasers and photodiodes, including monitoring performance, identifying yield detractors, and driving measurable yield improvement.


• Monitor electrical and optical device trends across wafers, lots, and manufacturing stages to identify process or epitaxial excursions, performance shifts, and emerging quality concerns.


• Analyze wafer-level and die-level test data using yield summaries, failure paretos, wafer maps, and statistical comparisons to prioritize improvement opportunities.


• Work closely with epitaxy, process engineering, device design, test, manufacturing, quality, and reliability teams to investigate failures and establish root cause.


• Develop and implement corrective and preventive actions with cross-functional teams. Verify effectiveness through device performance, yield improvement, and sustained process stability.


• Plan and evaluate experiments to understand relationships between epitaxial properties, fabrication processes, and device performance.


• Support product characterization, specification reviews, and evaluation of process changes to maintain product performance and manufacturability.


• Communicate yield trends, investigation findings, corrective actions, and improvement progress through clear technical reports and regular product reviews.

Education & Experience

• Minimum 4 years of relevant experience in semiconductor product engineering, device engineering, process engineering, or a related technical role.


• BS/MS in Electrical Engineering, Physics, Materials Science, Optical Engineering, or a related discipline, or an equivalent degree.


• Experience analyzing semiconductor device performance, investigating manufacturing yield loss, and applying structured root cause analysis.


• Experience with III-V semiconductor devices, particularly InP lasers or photodiodes, is preferred.

Skills

• Strong understanding of semiconductor laser fundamentals, including threshold current, optical gain and loss, slope efficiency, spectral behavior, and temperature-dependent performance.


• Strong root cause analysis and problem-solving skills, with the ability to connect device behavior to potential epitaxial, fabrication, or test-related causes.


• Working knowledge of statistical analysis, process control, and design of experiments.


• Ability to take ownership of yield issues, prioritize investigations, and follow corrective actions through implementation and verification.


• Strong interpersonal, teaming, and technical communication skills.


• Work effectively with other members of Coherent Corp. across engineering, manufacturing, quality, and reliability functions to resolve technical issues and improve product yield.


• Data processing, scripting, and automation skills are a significant plus, particularly experience with JMP/JSL, SQL, Python, or similar tools for analyzing large manufacturing datasets.

Working Conditions

• Work in office and semiconductor manufacturing environments.

Physical Requirements

• Ability to perform computer-based data analysis, prepare technical documentation, and participate in technical discussions.


• Ability to access laboratory and manufacturing areas, including occasional standing and walking, as required by the role.

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.:

Integrity – Create an Environment of Trust

Collaboration – Innovate Through the Sharing of Ideas

Accountability – Own the Process and the Outcome

Respect – Recognize the Value in Everyone

Enthusiasm – 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 [e-mail].

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!