It's fun to work in a company where people truly BELIEVE in what they're doing! We're committed to bringing passion and customer focus to the business. If you like wild growth and working with happy, enthusiastic over-achievers, you'll enjoy your career with us! About Lumentum Lumentum (NASDAQ: LITE) is a global leader in optical and photonic technologies that power the networks and infrastructure behind AI, cloud computing, and next-generation communications. Built on decades of photonics innovation, Lumentum delivers high-performance lasers, modules, and optical subsystems that enable scalable, energy-efficient data center connectivity, advanced telecom networks, industrial manufacturing, and sensing applications. Headquartered in San Jose, California, the company operates R&D, manufacturing, and sales facilities worldwide. Learn more at www.lumentum.com . Position: Engineer Principal, Manufacturing Product Location: Lumentum Thailand, Navanakorn – Pathum Thani Position Summary We are seeking an experienced Principal Manufacturing Product Engineer to provide technical leadership and drive product-engineering excellence for Cloud products. This role serves as the senior technical owner for assigned products, partnering with Manufacturing, R&D, Process Engineering, Quality, and NPI teams to ensure product designs are manufacturable, scalable, reliable, and capable of meeting performance, quality, delivery, and cost objectives throughout the product lifecycle. Key Responsibilities Product Ownership & Technical Leadership Serve as the principal Product Engineer for assigned Cloud products. Own product definition, technical performance, manufacturing readiness, and lifecycle execution. Act as the primary technical interface between Manufacturing, R&D, and global engineering teams. Lead resolution of complex product, manufacturing, and field-quality issues. Provide technical direction, risk assessment, and data-driven recommendations to stakeholders. Mentor engineers and strengthen product-engineering capability within the organization. Product Industrialization & NPI Lead product industrialization from development through volume production. Drive product-engineering activities for NPI, product transfer, qualification, and production ramp-up. Ensure BOMs, drawings, specifications, product configurations, and documentation are accurate and production-ready. Lead DfX reviews, including Design for Manufacturability, Assembly, Test, Reliability, and Cost. Ensure product and manufacturing risks are identified and controlled before release. Yield, Quality & Cost Excellence Drive improvements in product yield, performance, quality, reliability, and manufacturing cost. Lead root-cause investigations and corrective actions for complex manufacturing and field issues. Identify product-optimization and cost-reduction opportunities through design, material, and engineering changes. Review product data and technical trends to prevent recurring issues and improve product maturity. Cross-functional & Global Collaboration Lead alignment across Manufacturing, R&D, Process Engineering, Quality, NPI, Supply Chain, and global teams. Communicate technical status, risks, priorities, and improvement plans to senior stakeholders. Influence technical decisions and ensure timely execution of product-related actions. Support product and manufacturing strategies aligned with business priorities. Safety, Health & Environmental Responsibilities Comply with all EHS policies, procedures, and standards. Promote safe work practices and support continuous improvement toward a Zero Accident culture. Qualifications Bachelor's degree in Electrical, Mechanical, Optical, Manufacturing Engineering, Physics, or a related field; a master's degree is preferred. At least 12 years of experience in product engineering, manufacturing engineering, or a related technical role. Extensive experience supporting NPI, product transfer, volume ramp, and sustaining engineering. Strong understanding of product lifecycle management, configuration control, DfX, qualification, and engineering-change management. Experience in optical, photonic, semiconductor, electronics, or other high-technology manufacturing is strongly preferred. Proven ability to lead complex technical investigations and influence cross-functional decisions. Strong analytical, technical leadership, problem-solving, and stakeholder-management skills. Effective English communication and ability to work with global teams. Preferred Competencies Product Ownership and Technical Leadership Strategic and Systems Thinking Manufacturing and Business Acumen Complex Problem-Solving Risk-Based Decision-Making Cross-functional Influence Coaching and Capability Development Accountability and Results Orientation Working Conditions Work in office, engineering laboratory, cleanroom, and manufacturing-floor environments. Occasional support outside normal working hours may be required for production, NPI, or global collaboration. We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, sex, gender, gender expression, sexual orientation, age, marital status, veteran status, or disability status. We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, sex, gender, gender expression, sexual orientation, age, marital status, veteran status, or disability status. We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Please contact us to request accommodation.