[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 # Senior Design Engineer Fremont, CA, United States On-site Senior individual contributor Design Listed on Coherent’s official careers site. Posted July 21, 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/2013423) [OpenNash Jobs](https://jobs.opennash.com/) / [Coherent](https://jobs.opennash.com/companies/coherent/) / Senior Design Engineer ## Job description ### Primary Duties & Responsibilities Design, simulate, and develop high-speed, high-sensitivity InGaAs/InP photodiodes for optical transceivers and next-generation optoelectronic applications. Support product development from concept through qualification and manufacturing, ensuring performance, quality, and reliability objectives are achieved. Collaborate with epitaxial growth and semiconductor process engineers to define and optimize device structures, epitaxial designs, and fabrication processes. Work closely with test and reliability engineers to develop characterization plans, analyze device performance, and coordinate reliability qualification activities. Evaluate device performance through electrical and optical characterization and recommend design improvements based on test results. Partner with internal wafer fabrication teams and external manufacturing partners to develop and implement advanced manufacturing technologies. Analyze engineering data, troubleshoot technical issues, and drive continuous improvements in device performance, manufacturability, and yield. Document design methodologies, experimental results, and technical findings while contributing to intellectual property development and innovation initiatives. Stay current with emerging technologies and industry trends in photodiodes, optical communications, and III-V semiconductor devices. manufacturing technologies. ### Education & Experience PhD in photodiodes design and development or with 3+ years of relevant experience Optoelectronic device design and simulation Familiar with photodiode epi materials growth and development wafer front process and backend process. test and characterization. Strong analytical and problem-solving skills with the ability to work effectively in cross-functional engineering teams. Excellent written and verbal communication skills. ### Skills - Understand the architectural designs of high-speed and high-sensitive InGaAs / InP photodiodes - Support design high-speed and high-sensitive photodiode epi structures - Support design both front- and back-end wafer process flows - Support and Perform device characterization - Support product qualification and release Working Conditions This role will be based on-site in Fremont, CA. Regular use of a computer and other office equipment is necessary. Physical Requirements Sitting for extended periods while working on a computer or in meetings. Use of hands and fingers for typing, writing, and handling documents. Occasional lifting of objects or materials up to 20 pounds for administrative tasks. Ability to communicate verbally and in writing. 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: Jul 21, 2026 - First seen by OpenNash: Oct 11, 2026 - Last checked: Oct 18, 2026 - Listed for: 89 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/2013423) ## More jobs at Coherent ### [Lead Design Engineer](https://jobs.opennash.com/companies/coherent/jobs/bb65ca3801d4d066afde/) Fremont, CA, United States ### [Lead Electrical Design Engineer](https://jobs.opennash.com/companies/coherent/jobs/0204f98db4f25e84e465/) Fremont, CA, United States ### [Principal Design Engineer](https://jobs.opennash.com/companies/coherent/jobs/4ca9e1a7fd9ab4da9843/) Fremont, CA, United States ### [Senior Optical Transceiver Test/Design Engineer](https://jobs.opennash.com/companies/coherent/jobs/484ea492cded3b013546/) Fremont, CA, United States ### [Sr. Principal Module Design Engineer](https://jobs.opennash.com/companies/coherent/jobs/f798e253b4994f336d88/) Fremont, CA, United States ## Similar jobs at other companies ### [ElectroMechanical Design Engineer (Harness Design)](https://jobs.opennash.com/companies/lockheed-martin/jobs/569a4923ece2ce5bd925/) Lockheed Martin · Orlando, FL ### [Circuit Design Engineer II - CCA Design](https://jobs.opennash.com/companies/lockheed-martin/jobs/8137c8df707402b35fde/) Lockheed Martin · Littleton, CO ### [Senior Design Engineer - OHL England, AR England, AR ENGINEERING / DESIGN STUDIES / METHODS ENGINEERING / DESIGN STUDIES / METHODS](https://jobs.opennash.com/companies/vinci/jobs/df61f6056abfde88babd/) VINCI · England, AR ### [Junior Tendering Engineer England, AR England, AR ENGINEERING / DESIGN STUDIES / METHODS ENGINEERING / DESIGN STUDIES / METHODS](https://jobs.opennash.com/companies/vinci/jobs/3017bf700baf3ad59e1b/) VINCI · England, AR ### [Roadway Design Engineer](https://jobs.opennash.com/companies/ferrovial/jobs/6452d3b2e597f590ea68/) Ferrovial · Nashville, TN OpenNash lists jobs from employers’ own careers sites and does not handle applications. Dates come from the employer where stated; “first seen” and “last checked” are our own observations. OpenNash Jobs · Official listings with dates and links to the employer. [Weekly hiring report](/reports/hiring/) · [Methodology](/methodology/)