Staff Wafer-level Testing Engineer (Operations & Process)

Lumilens Inc.; Singapore; On-site; SGD 90,000 - 150,000; Full time

Benefits offered by this job

Competitive salary

Career growth

World-class team

Collaborative environment

Job summary

Lumilens is seeking a hands-on wafer-level test engineer to own and optimize wafer-level testing processes in our Singapore fab. You will lead setup and qualification of automated probers, optical alignment systems, and ATE, and drive yield, cycle time, and process control improvements with cross-functional teams.

You should have a strong analytical mindset, 5+ years in semiconductor wafer testing, and proficiency with data analysis tools (Python/R/Spotfire) to monitor performance and implement

Qualifications

• Bachelor’s degree in a relevant engineering field.
• Minimum 5 years in semiconductor wafer-level testing.
• Proficient in data analysis for yield modeling and SPC.
• Experience with DOE and continuous improvement.
• Strong cross-functional communication and project management.

Responsibilities

• Wafer-Level Test Process Ownership: Own and continuously improve wafer-level test processes for stable, repeatable production.
• Production Operations: Drive day-to-day wafer-level test operations and monitor performance.
• Test Process Development & Qualification: Develop and qualify test flows, conditions, and parameters.
• Process Control: Establish specifications, control plans, and monitoring methods.
• Yield Improvement & Failure Debug: Monitor yield, identify losses, and lead corrective actions.
• Test Data Analysis: Analyze data to identify trends and shifts; track performance metrics.
• Process Documentation: Create process specs, work instructions, and qualification reports.
• Cycle Time & Productivity Improvement: Improve test cycle time, throughput, and cost.
• Continuous Improvement: Lead DOE, SPC, Six Sigma projects to improve capability.
• Cross-Functional Collaboration: Work with engineering, quality, supply chain, and management.

Skills

Analytical thinking

Problem solving

Cross-functional collaboration

Process optimization

Data-driven decision making

Education

Bachelor’s degree in Electrical/ Electronics/ Microelectronics/ Physics/ Optical Engineering

Tools

JMP

Spotfire

Python

R

Job description

About Lumilens

At Lumilens, we are building the essential photonics infrastructure that will drive tomorrow’s AI supercomputing. From chip-to-chip optical interconnects to scalable photonic engines, Lumilens is ushering in a new era of computing that is faster, cooler, and dramatically more efficient. We’re a well-funded startup backed by Mayfield and led by veterans who have built and scaled some of the industry’s most transformative technologies.

About the Role

This is a critical technical role responsible for the operational execution, process control, and continuous improvement of Lumilens’ wafer-level testing operations. You will serve as a key owner of wafer-level test processes, test flow, manufacturing readiness, production performance, yield, and process optimization, working closely with internal engineering teams and external manufacturing partners to ensure robust, scalable, and efficient wafer-level testing. The role requires a highly analytical and hands-on engineer who can translate product and test requirements into reliable production processes and drive continuous improvement.

Key Responsibilities

• Wafer-Level Test Process Ownership: Own and continuously improve wafer-level test processes to ensure stable, repeatable, and efficient production execution. Lead the setup, qualification, and day-to-day operation of automated wafer probers, optical alignment systems, and Automated Test Equipment (ATE) for electrical and photonic wafer-level testing.

• Production Operations: Drive day-to-day wafer-level test operations, monitor production performance, identify process constraints, and ensure execution against production plans and quality requirements.

• Test Process Development & Qualification: Develop, optimize, and qualify wafer-level test processes, including test flows, test conditions, process parameters, and operating procedures for new and existing products.

• Process Control: Establish and maintain process specifications, control plans, operating windows, and monitoring methodologies to ensure consistent test performance and minimize process variation.

• Yield Improvement & Failure Debug: Monitor wafer-level test yield and defect performance, identify systematic and process-related losses, and lead improvement activities to increase yield and manufacturing efficiency. Drive effective corrective and preventive actions to prevent recurrence.

• Test Data Analysis: Analyze wafer-level test data to identify trends, abnormal conditions, process shifts, and systematic failures. Establish appropriate metrics and monitoring mechanisms to track production performance.

• Process Documentation: Develop and maintain test process specifications, work instructions, control plans, qualification reports, and other manufacturing documentation required for production execution.

• Cycle Time & Productivity Improvement: Drive improvements in test cycle time, throughput, yield, process efficiency, and overall manufacturing cost without compromising product quality or reliability.

• Continuous Improvement: Lead structured improvement activities using data-driven methodologies such as DOE, SPC, Six Sigma, and root-cause analysis to improve process capability and manufacturing performance.

• Cross-Functional Collaboration: Work closely with product engineering, quality, supply chain, industrial engineering, and program management teams to ensure successful product qualification, production ramp, and ongoing manufacturing execution.

Requirements & Qualifications

• Bachelor’s degree in Electrical Engineering, Electronics Engineering, Microelectronics, Physics, Optical Engineering, Semiconductor Engineering, or a closely related discipline.

• Minimum 5 years of experience in semiconductor wafer-level testing, wafer sort, test process engineering, manufacturing operations, parametric test process engineering within semiconductor fab, OSAT, high-tech manufacturing environment or silicon photonics environments.

• Strong analytical and problem-solving skills, with demonstrated ability to analyze test data, identify root causes, and drive permanent corrective actions. Proven proficiency in data analysis software (e.g., JMP, Spotfire, Python, R) for yield modeling, statistical process control (SPC), and test time reduction.

• Strong understanding of wafer-level test processes, test flow development, process control, yield management, and production test methodologies.

• Strong cross-functional communication and project management skills, with the ability to drive technical issues to closure across internal and external teams.

• Experience in photonics, silicon photonics, optical devices, or advanced semiconductor packaging is a strong advantage.
  

Benefits

• Competitive salary and benefits

• Opportunities for career advancement

• Work with a world-class team solving cutting-edge challenges

• Collaborative and innovative work environment
  

Lumilens is committed to building a diverse and inclusive workplace. We are proud to be an equal opportunity employer.