Backend Process Engineer - Sherman, TX, United States
Originally posted 9 September 2026 by the employer.
This position is responsible for facet inspection Automated Optical Inspection (AOI) unit process.
About the role
This position is responsible for the facet inspection Automated Optical Inspection (AOI) unit process used to detect, classify, and control visual defects on semiconductor laser facets and related device surfaces. The Engineer will own inspection performance, yield monitoring, defect classification, recipe development, and continuous improvement for AOI inspection.
What you'll do
- Be responsible for wafer back-end processes like dicing, sorting, top/bottom/facet AOI, frame creation, tape/detape, wafer/frame cleaning. - Monitor process performance using SPC, inspection yield, defect pareto, false-call/escape metrics, and equipment health indicators; maintain process control and respond to excursions. - Develop, characterize, optimize, and release process recipes for semiconductor laser facet inspection, including lighting, focus, image acquisition, inspection regions, thresholds, algorithms, and defect classification criteria. - Plan and execute engineering experiments, gauge studies, correlation studies, and capability analyses to improve defect detection sensitivity, repeatability, reproducibility, and discrimination between true defects and cosmetic variation. - Drive continuous improvement activities to reduce scrap and reinspection, improve process capability and throughput, reduce cycle time and cost, and increase automated disposition where technically justified. - Train Process Technicians, Operators, and Engineers on facet inspection methods, AOI/dicing/sorting recipes, defect classification, reaction plans, and proper handling of inspected material.
What you'll need
- A bachelor's degree in Electrical Engineering, Mechanical Engineering, Materials Science, Physics, Optics/Photonics, Computer Engineering, or a closely related science or engineering major and at least 2 years of relevant experience in semiconductor, optoelectronics, precision inspection, machine vision, or automated manufacturing. - Working knowledge of semiconductor wafer/device processing, engineering practices, and manufacturing process control. - Deep Knowledge of automated optical inspection (AOI), machine vision, optical microscopy, image acquisition, lighting, focus, and defect detection concepts. - Ability to develop and optimize recipes, thresholds, regions of interest, defect classifiers, and acceptance criteria for high-volume manufacturing. - Knowledge of engineering statistics including SPC, DOE, process capability, measurement system analysis, gauge R&R, correlation, and hypothesis testing. - Ability to analyze inspection images and large defect datasets, build paretos and trend analyses, and distinguish true process defects from inspection artifacts or nuisance calls.
Nice to have
- Experience with semiconductor laser devices, GaAs/InP processing, optical microscopy, machine vision, or automated optical inspection. - Experience with semiconductor laser facets, cleaved/coated optical surfaces, GaAs/InP devices, or optoelectronic manufacturing. - Fluency in MS Office suite and JMP or other statistical analysis software; experience with AOI software, image analysis tools, SQL/Python, or manufacturing data systems.
Skills: AOI, facet inspection, defect classification, SPC, recipe development
This role has been open 35 days — exactly the 35-day median for Process Engineering roles.
Process Engineering · Metrology Inspection
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Open roles in category
26
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Median days open
35 d
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Median salary
—
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See the full market breakdown ▾Category comparison, skills in demand, and who else is hiring
| Metric | Coherent Corp | All employers we track in this specialty (26 roles · 9 employers) |
|---|---|---|
| Open roles in this specialty | 2 | 26 |
| Open roles in the wider Process, Fab & Equipment family | 136 | 9879 · 109 employers |
| Median days open | 32 d | 35 d (−3 d vs this employer) |
| Median salary (USD postings) | — | — |
Skills observed across this category: AOI, facet inspection, defect classification, SPC, recipe development
Who's hiring in this category
- Micron Technology · 13 open roles · median 30 d
- Skyworks · 3 open roles · median 76 d
- Coherent Corp (this employer) · 2 open roles · median 32 d
- Entegris · 2 open roles · median 74 d
- STMicroelectronics · 2 open roles · median 32 d
- ASM International · 1 open role · median 14 d
How we counted: 26 open Process Engineering (Metrology Inspection) roles from 9 employers tracked in the SemiconductorJobs index, counted 15 Oct 2026. Specialty figures count only roles carrying this exact specialty label, so an employer's related work in neighbouring specialties is not included there — it is counted in the wider Process, Fab & Equipment family row. Figures refresh nightly.