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Senior Engineer

Coherent Corp. US
Fremont, CA Full Time
POSTED ON 2/18/2026 CLOSED ON 4/29/2026

What are the responsibilities and job description for the Senior Engineer position at Coherent Corp. US?

About Indium Phosphide (InP) Technology
The world’s communications infrastructure depends on semiconductor lasers, and particularly those based on indium phosphide technology. Indium phosphide lasers are engineered to emit at wavelengths that are optimal for long-distance transmission through fiber optics. In short, they enable the optical networks that form the global internet.

Coherent’s broad portfolio of InP components includes application-specific Fabry-Pérot lasers, directly modulated lasers (DMLs), and tunable lasers. It also includes photodiodes for high-speed receivers and power monitoring. In 2022, we introduced 200 Gbps indium phosphide electro-absorption modulated lasers (EMLs) for high-speed datacenter transceivers. This design provides our customers with the most advanced, robust, and cost-competitive laser devices for their 800G and next-gen 1.6T datacom transceiver designs. 

Our world-class and highly reliable InP technology platform is one of the very few in the industry that has been proven, with more than one hundred million lasers in the field deployed over the last decades.

We are seeking a Senior Engineer to sustain and optimize Wet Etch and eBeam Lithography processes and tools at our Fremont Christy site.

 

Primary Duties & Responsibilities

  • Sustain and develop Wet Etch and electron-beam Lithography processes
  • Analyze statistical process control (SPC) data and respond in time to ensure process quality and reliability 
  • Disposition lots on hold. Investigate root causes of failures and optimize the process
  • Document Work Instructions and Process Flows. Train production technicians
  • Maintain metrology tools in responsible areas
  • Collaborate across multiple teams to ensure product quality and high yield

 

Education & Experience

  • PhD., M.S., or B.S. in Electrical Eng., Chemical Eng., Material Eng. or equivalent experience in the related fields. 
  • 2 or more years of hands-on experience in processing and characterization of semiconductor materials in cleanroom.

Skills

  • Experience in wafer process, especially in wet etch and lithography
  • Experience with metrology tools of step profiler, CDSEM, and AFM
  • Experience with data analysis programs and SPC rules
  • Knowledge of semiconductor lasers and detectors

Working Conditions

  • On-site

Physical Requirements

  • Able to work in a clean room.

 

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 talentacquisition@coherent.com.


 

Salary.com Estimation for Senior Engineer in Fremont, CA
$133,308 to $159,855
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