Senior Tester

Job Summary

Perform scheduled preventive maintenance (PM) on lithography tools (scanners, steppers,

tracks) and associated inspection/metrology systems, following OEM and client procedures.

• Support corrective maintenance: troubleshoot faults at module and board level, replace parts,

and run post-maintenance qualifications to return tools to production.

• Carry out calibrations, alignments and performance checks, and record results against tool

specifications.

• Respond to tool-down calls within shift SLAs and escalate to senior FSEs or OEM support when

needed.

• Log all work accurately in the client's CMMS/ticketing system, including parts used, downtime

and root cause.

• Assist with tool installations, upgrades, retrofits and de-installations.
• Monitor spare-parts usage and flag consumables and critical spares for replenishment.
• Follow cleanroom protocols, lock-out/tag-out (LOTO) and EHS requirements (SEMI S2/S8 aware)

at all times.

• Contribute to uptime, MTBF and MTTR improvement through shift handovers, issue tracking

and lessons learned.

• Work rotating shifts, including nights, weekends and on-call, in line with fab operating needs.

Key Responsibilities

Perform scheduled preventive maintenance (PM) on lithography tools (scanners, steppers,

tracks) and associated inspection/metrology systems, following OEM and client procedures.

• Support corrective maintenance: troubleshoot faults at module and board level, replace parts,

and run post-maintenance qualifications to return tools to production.

• Carry out calibrations, alignments and performance checks, and record results against tool

specifications.

• Respond to tool-down calls within shift SLAs and escalate to senior FSEs or OEM support when

needed.

• Log all work accurately in the client's CMMS/ticketing system, including parts used, downtime

and root cause.

• Assist with tool installations, upgrades, retrofits and de-installations.
• Monitor spare-parts usage and flag consumables and critical spares for replenishment.
• Follow cleanroom protocols, lock-out/tag-out (LOTO) and EHS requirements (SEMI S2/S8 aware)

at all times.

• Contribute to uptime, MTBF and MTTR improvement through shift handovers, issue tracking

and lessons learned.

• Work rotating shifts, including nights, weekends and on-call, in line with fab operating needs.

Skill Requirements

Diploma in Electronics, Electrical, Mechatronics, Mechanical or a related engineering field.

• 1-3 years' hands-on experience in semiconductor fab equipment maintenance, preferably on

lithography, inspection systems or comparable equipment.

• Working knowledge of electronics, electro-mechanical systems, vacuum, pneumatics and basic

optics.

• Able to read schematics, interlock diagrams and OEM manuals, and use standard test

equipment (multimeter, oscilloscope).

• Experience working in a cleanroom environment under strict safety and contamination-control

protocols.

• Willing to work rotating shifts and be on call.
• Singapore Citizen or Singapore Permanent Resident. Malaysian citizens are also welcome to

apply.

Other Requirements

Preferred and good-to-have

• Exposure to DUV or EUV lithography scanners, track systems, or wafer inspection/metrology

tools.

• OEM training certificates or formal equipment courses.
• Familiarity with SECS/GEM, tool logs and data-driven troubleshooting.
• Basic understanding of SPC, uptime/MTBF/MTTR metrics and 8D or root-cause analysis