Senior Plant Maintenance Manager

Coherent Corp., named to Forbes' 2026 America's Best Companies, is a global leader in the datacenter and communications industries. Headquartered in Saxonburg, Pennsylvania, USA, and founded in 1971, Coherent operates in over 20 countries worldwide. Since entering Vietnam in 2005, Coherent has expanded to more than 3,200 employees across Ho Chi Minh (VSIP1), Dong Nai (Nhon Trach 1), Hanoi, and Bac Ninh (Yen Phong IP). As part of our global growth strategy and commitment to developing local talent, we aim to create over 8,000 new job opportunities in Vietnam within the next five years through hundreds of millions of dollars in investment projects.
Work Location: VSIP I (Ho Chi Minh)
BASIC FUNCTION OF THE JOB:
- Lead a high-performing Plant Maintenance organization to ensure the reliability, availability, safety, compliance, and optimal performance of all manufacturing equipment, automated production systems, utilities, facilities, and plant infrastructure at AO VSIP 1.
- Provide strategic leadership for Equipment Maintenance and Facilities teams to drive asset reliability, business continuity, and operational excellence.
- Develop and implement preventive, predictive, and reliability-centered maintenance (RCM), lifecycle management, spare parts optimization, and continuous improvement initiatives to maximize equipment uptime and Overall Equipment Effectiveness (OEE).
- Modernize maintenance capabilities by adopting advanced technologies, automation, digitalization, AI-enabled predictive maintenance, smart diagnostics, and condition monitoring.
- Build and develop team capabilities to support increasingly advanced manufacturing technologies and align maintenance practices with industry best practices.
- Collaborate closely with Engineering, Manufacturing, Quality, EHS, contractors, equipment service providers, and suppliers to proactively manage asset risks, infrastructure readiness, technology upgrades, and long-term asset replacement strategies.
- Build a scalable, future-ready maintenance organization that supports safe, reliable, efficient, and sustainable operations while enabling business expansion, long-term growth, and manufacturing excellence
Leadership, Supervision & Organization Development
- Build, lead, coach, and develop the Equipment Maintenance and Facilities teams to deliver stable and sustainable performance.
- Ensure the maintenance organization is adequately staffed, trained, engaged, and empowered to maintain production equipment, utilities, facilities, and critical plant systems.
- Execute performance management, employee development, succession planning, recruitment, coaching, and communication activities effectively and on schedule.
- Foster a culture of open communication, accountability, safety, quality ownership, customer focus, and employee engagement.
- Maintain clean, safe, and organized work areas while serving as a role model for ethics, professionalism, leadership, technical competence, and business performance.
2. Business Operations, Budget & Governance
- Prepare and manage annual budgets for maintenance, spare parts, utilities, facility services, projects, and equipment replacement or upgrades.
- Establish and monitor department KPIs, including OEE, equipment uptime, MTBF, MTTR, preventive maintenance (PM) compliance, utility availability, maintenance cost, energy consumption, and project delivery.
- Ensure maintenance records, reports, performance metrics, and documentation are accurate, controlled, and submitted on time.
- Ensure maintenance and facilities processes comply with ISO 9001, ISO 13485 (where applicable), ITAR/Export Compliance, SOX, Quality, EHS, and corporate procedures.
- Review and continuously improve maintenance processes using Lean, Six Sigma, Process Value Chain, and continuous improvement methodologies to increase efficiency and reduce cycle time.
3. Manufacturing Equipment Maintenance & Reliability
- Lead day-to-day maintenance activities for all manufacturing equipment to ensure safe, reliable, and efficient operations with minimal downtime.
- Develop, implement, and sustain preventive, predictive, and corrective maintenance programs for production equipment, automation systems, and supporting equipment.
- Drive equipment reliability improvements using Root Cause Analysis (RCA), Failure Mode and Effects Analysis (FMEA), MTBF, MTTR, OEE analysis, Total Productive Maintenance (TPM), risk assessment, 5 Whys, and permanent corrective actions.
- Optimize maintenance planning, work scheduling, maintenance system utilization, repair quality, and maintenance execution effectiveness.
- Develop and implement spare parts strategies to ensure the availability of critical components while minimizing excess inventory and overstock.
- Support new equipment selection, installation, qualification, handover, upgrades, capacity expansion, and equipment lifecycle replacement planning.
4. Facilities, Utilities & Site Infrastructure Management
- Design, maintain, repair, and improve plant facilities, building infrastructure, utility systems, and production support equipment.
- Ensure reliable operation of HVAC, chillers, cleanrooms, air compressors, vacuum systems, RO/DI water systems, wastewater treatment, HT/LT electrical systems, fire protection, BMS, and SCADA systems.
- Maintain required environmental and utility conditions, including temperature, humidity, water quality, compressed air, vacuum, electrical power, fire safety, and environmental controls for production areas.
- Manage contractors, vendors, consultants, and service providers for equipment installation, relocation, modification, preventive maintenance, calibration, inspection, and handover activities.
- Ensure contractor work complies with technical specifications, building codes, safety requirements, manufacturer guidelines, statutory regulations, and approved schedules.
- Maintain system documentation, operating procedures, work instructions, calibration schedules, shutdown checklists, security support, and housekeeping standards.