Senior Manufacturing Engineer, High-Precision Assembly

Coherent Vietnam is seeking Manufacturing Engineers to support the transfer, ramp-up, and ongoing production of high-precision optical, mechanical, and opto-mechanical assemblies used in advanced semiconductor equipment.

This role is focused on precision assembly in a Class 1000 cleanroom environment. The products are complex, high-value subassemblies where dimensional accuracy, optical performance, cleanliness, FOD/ESD control, process discipline, and documentation accuracy are critical.

The selected candidates will work closely with global engineering, manufacturing, quality, metrology, and production teams to establish robust local manufacturing capability in Vietnam. The role includes hands-on process support, technician training, troubleshooting, continuous improvement, and close collaboration with the United States development and manufacturing teams.

The selected candidates will have the opportunity to spend significant upfront training time in the United States.

We are open to considering candidates at Engineer, Senior Engineer, or Team Lead level depending on relevant experience, technical expertise, and leadership capability.

Manufacturing Environment

This is not a traditional high-volume production role. The manufacturing environment is low-volume, high-value, and technically demanding, with strict customer, quality, and documentation requirements.

You will work with:

• High-precision optical, mechanical, and opto-mechanical assemblies used in advanced semiconductor equipment
• Class 1000 cleanroom manufacturing environments
• Sensitive optical, coated, precision-machined, and high-value components
• Strict FOD, ESD, contamination-control, and cleanliness requirements
• Precision assembly tooling, calibrated fixtures, torque tools, adhesives, and alignment methods
• Advanced inspection and metrology systems including CMM, optical inspection, interferometry, and precision mechanical measurement equipment
• Manufacturing processes with strong emphasis on quality, traceability, process stability, yield, and on-time delivery

Working Location: Nhon Trach 1 (Dong Nai)

Key Responsibilities:

• Support the transfer and ramp-up of high-precision semiconductor equipment assembly processes from the United States to Vietnam.
• Develop, review, maintain, and improve manufacturing processes for complex optical, mechanical, and opto-mechanical assemblies to ensure process stability, product quality, yield performance, operational efficiency, and on-time delivery.
• Create and update work instructions, assembly procedures, process-control sheets, travelers, kitting documents, inspection records, and technician training materials, ensuring alignment with quality and traceability requirements.
• Train, support, and qualify technicians and production teams on assembly methods, cleanroom behavior, optical-component handling, tooling, inspection steps, documentation discipline, and quality requirements.
• Work hands-on in a Class 1000 cleanroom manufacturing environment with precision components, calibrated tools, fixtures, adhesives, and inspection equipment.
• Support setup, qualification, use, and improvement of assembly tooling, fixtures, process equipment, inspection methods, and process controls.
• Ensure compliance with FOD, ESD, cleanliness, contamination-control, product-handling, optical-component handling, cleanroom requirements.
• Troubleshoot assembly, alignment, inspection, cleanroom, and process issues; identify root causes; and implement effective corrective and preventive actions.
• Support first-article builds, pilot builds, process validation, production qualification, manufacturing readiness, and production ramp activities.
• Work with CMM, precision mechanical measurement tools, optical inspection tools, and interferometric metrology systems as required.
• Analyze process data, inspection results, metrology data, and quality trends to improve yield, process stability, cycle time, and overall manufacturing performance.
• Support process capability improvement, process-control activities, and data-driven problem solving to strengthen manufacturing performance and process stability.
• Work closely with engineering, production, quality, maintenance, supply chain, metrology, and global technical teams to support operational objectives, customer requirements, and manufacturing readiness.
• Support customer audits, internal audits, ISO activities, and quality-system requirements as required.
• Promote a disciplined, safe, clean, and continuous-improvement-oriented manufacturing environment.

Requirements:

• Bachelor's degree in Engineering, Science, or a related technical field. Preferred majors include Mechanical Engineering, Manufacturing Engineering, Mechatronics Engineering, Precision Engineering, Industrial Engineering, Optics or Optical Engineering, Materials Science, Physics, or Applied Physics.

• 3–5 years of experience in manufacturing engineering, assembly engineering, process engineering, production engineering, or related technical roles within high-precision manufacturing environments.

• Experience in one or more of the following industries is highly preferred:

  Semiconductor equipment manufacturing,

  Optical or photonics manufacturing,

  High-precision mechanical or opto-mechanical assembly,

  Precision machining and tooling,

  Cleanroom manufacturing,

  Medical device manufacturing,

  Aerospace manufacturing,

  Automotive precision manufacturing,

  High-reliability industrial manufacturing

• Experience working with precision assembly tools, calibrated tools, fixtures, torque tools, adhesives, and precision measurement equipment.
• Familiarity with calipers, micrometers, depth gauges, height gauges, dial indicators, and similar precision inspection tools.
• Experience with CMM inspection, precision metrology, optical measurement, interferometry, or other high-accuracy inspection methods is strongly preferred.
• Ability to read and interpret engineering drawings, tolerances, assembly procedures, process-control documentation, inspection records, and metrology reports.
• Understanding of FOD control, ESD control, contamination prevention, 5S, Lean Manufacturing, and continuous improvement methodologies is advantageous.
• Strong hands-on engineering mindset with the ability to work directly on the manufacturing floor.
• High attention to detail and commitment to process discipline and quality.
• Strong analytical, troubleshooting, and problem-solving skills.
• Ability to identify process gaps, tooling limitations, quality risks, and training needs.
• Effective communication skills and ability to collaborate with technicians, engineers, quality teams, production leaders, metrology teams, and international stakeholders.
• Good English communication skills are required.
• Willingness and ability to travel to the United States for technical training and technology transfer activities.
• Strong ownership mindset, patience, discipline, and commitment to operational excellence.

Preferred Candidate Profile

Direct semiconductor equipment experience is not required. We welcome candidates from related high-precision industries, including:

• Semiconductor equipment manufacturing
• Optical assembly and photonics manufacturing
• High-precision mechanical or opto-mechanical assembly
• Cleanroom manufacturing
• Precision machining and machine-build environments
• Medical devices
• Aerospace manufacturing
• Automotive precision manufacturing
• Metrology and high-accuracy inspection systems
• Low-volume, high-value manufacturing environments with strict process and documentation control

Why Join Us?

This is a high-growth opportunity to help build advanced high-precision optical and mechanical assembly capability for semiconductor equipment in Vietnam. You will gain exposure to international engineering teams, advanced cleanroom manufacturing practices, semiconductor-industry quality expectations, precision metrology, optical inspection methods, and hands-on technical training in the United States. As Vietnam becomes a strategic growth location for advanced manufacturing, this role offers strong career-development potential in a specialized and growing field. The successful candidates will contribute directly to building a new local capability for Coherent Vietnam and supporting global semiconductor equipment supply chains.

Culture Commitment

Ensure adherence to company’s values (ICARE) in all aspects of your position at Coherent Corp.:

Integrity – Create an Environment of Trust

Collaboration – Innovate Through the Sharing of Ideas

Accountability – Own the Process and the Outcome

Respect – Recognize the Value in Everyone

Enthusiasm – Find a Sense of Purpose in Work

Coherent Corp. is an equal opportunity/affirmative action employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law.