Location: Alhambra, CA

Position Summary: The Backend Process Engineer – InP Wafer Fab position is responsible for development, optimization, and manufacturing support of backend wafer fabrication processes for Indium Phosphide (InP)–based photonic devices, including DFB lasers, Semiconductor Optical Amplifiers (SOAs), and Gain Chip products. This role provides technical ownership of critical backend modules including wafer lapping/thinning, n-side metallization, rapid thermal annealing (RTA), and automated optical inspection (AOI). The position also supports singulation, optical coatings, reliability readiness, and packaging interfaces, with a strong focus on yield, defect reduction, and manufacturing stability.

Responsibilities:

Backend Process Ownership and Optimization (35%):

Own and optimize backend wafer fab processes including lapping/thinning, n-side metallization, and RTA

Establish robust process windows, recipes, and control limits for backend modules

Maintain stable manufacturing performance through continuous monitoring and improvement

Yield Improvement, Defect Reduction, and AOI Control (25%):

Own and maintain AOI processes for backend defect detection and yield monitoring

Drive singulation yield improvement and defect reduction through data analysis and root-cause investigations

Analyze inline and post-process data to identify trends and systematic issues

Implement corrective and preventive actions and verify effectiveness

Singulation, Optical Coatings, and Packaging Interface Support (20%):

Support cleaving, dicing, and singulation processes to ensure device integrity

Provide process engineering support for AR/HR optical coatings and vendor qualifications

Collaborate with packaging, device, and reliability teams to ensure packaging readiness

New Product Introduction and Technology Support (10%):

Support new product introduction (NPI), process transfers, and technology changes

Evaluate backend process risks associated with new designs, materials, and device structures

Documentation, Process Control, and Manufacturing Support (10%)

Author and maintain SOPs, travelers, process specifications, and control plans

Define SPC metrics and control strategies for backend processes

Provide hands-on manufacturing and troubleshooting support as needed

Minimum Qualifications:

Bachelor’s degree or higher in Chemical Engineering, Materials Science, Electrical Engineering, Physics, or a related field

Minimum of 3+ years of experience in backend semiconductor processing

Hands-on experience with lapping/thinning, metallization, and thermal processes

Understanding of InP-based or III-V compound semiconductor wafer fabrication processes

Experience with AOI systems, yield analysis, and data-driven process improvement

Strong understanding of singulation, packaging interfaces, and reliability requirements

Proficiency in SPC, DOE, and statistical analysis

Ability to work across cross-functional manufacturing and engineering teams

Preferred experience with InP or III-V optoelectronic devices

Familiarity with AR/HR optical coating processes

Experience supporting high-mix, low-volume manufacturing environments preferred

The intent of this job description is to describe the major duties and responsibilities performed by incumbents of this job. Incumbents may be required to perform job-related tasks other than those specifically included in this description.

All duties and responsibilities are essential job functions and requirements and are subject to possible modification to reasonably accommodate individuals with disabilities.

A reasonable estimate of the pay range for this position is $100,000 - $135,000. There are several factors taken into consideration in determining base salary, including but not limited to: job-related qualifications, skills, education and experience, as well as job location and the value of other elements of an employee’s total compensation package.

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