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Principal Engineer, Test

Coherent Đồng Nai Province, Vietnam

onsite
Posted Aug 25, 2026

**Role & seniority: ** Optical/Test Engineering role; Individual Contributor (IC) with 8+ years optical/test relevant industry experience (MS preferred).

**Stack/tools (preferred): **

  • Protocols: USB, I2C, SPI, GPIB

  • Electronics: basic electronics understanding; high-speed digital data concepts (plus)

  • Testing/statistics: Minitab (or equivalent), Gage R&R, SPC/statistical analysis

  • Other: database interfacing and numerical analysis (plus)

  • Top 3 responsibilities:

    1. Requirements → test approach: collect/understand tester requirements; research features; coordinate cross-team solution discussions.

    2. Test system design & build: produce detailed design; design/enable fixtures and equipment; define test algorithms and support software coding.

    3. Verification, release, and sustainment: set up test bench; fixture/electrical + software logic verification; run qualification tests; draft work instructions; improve robustness and reduce cost; perform maintenance.

  • Must-have skills:

    • Strong electronics fundamentals

    • Ability to design/verify test systems (fixture/electrical + software logic)

    • Cross-prioritization and cross-organizational collaboration capability

    • Statistical testing competency (Gage R&R/SPC via Minitab or equivalent)

  • Nice-to-haves:

    • Programming skills (database interfacing, numerical analysis)

    • Knowledge of high-speed digital data concepts

    • Additional educati

Full Description

Primary Duties & Responsibilities

  1. Requirement collection and understanding-10%
  • Collect and understand the tester requirement from the requestor.

  • Investigate and search for features, drive for a solution with

  • discussion/reviewing cross teams.

  1. Design & Implementation-30%
  • Finish the detailed design report.

  • Follow the design report to purchase the relative equipment and fixture

  • design.

  • Work out the test algorithm and assist with software engineer to complete

  • the software coding.

  1. Design Verification-20%
  • Setup the test bench.

  • Fixture and electrical verification.

  • Software logic verification.

  1. Release and maintenance-20%
  • Follow the company policy and complete the qualification test.

  • Draft the work instruction for the test bench.

  • Improving and optimizing the test system to be more robust and drive cost

  • reduction projects.

  • Normal maintenance.

  1. Human Resources / Administrative-10%
  • An ESGP is co-developed and pursued.

  • Department information systems, records, reports and metrics are accurate

  • and generated on time.

  • Company policy is followed regarding all safety, environmental, quality and

  • ergonomic requirements.

  • Company Technology Control Plan, IP protection and Export Compliance

  • requirements are understood and properly followed.

  • Relevant SOX, IT and Quality procedures are understood and properly

  • executed.

  • Responsible for maintaining a quality work environment.

  • Maintains a positive attitude and is cooperative in working with others.

  • Adapts readily to changes in work caused by new requirements and/or

  • situations.

  • A high standard of ethics, professionalism, competency, and quality is

  • established and maintained.

  • Role model for Quality, Customer Satisfaction, Employee Satisfaction and

  • Business Results.

Education & Experience

  • MS in Electrical Engineering, Optics or Physics. Advanced educational qualifications will be a plus. Candidates having suitable professional experience with a BS degree will be considered.
  • 8+ years’ optical/ test relevant industry experience.

Skills

  • Good understanding of basic electronics required.
  • Knowledge of various protocols (USB, I2C, SPI, GPIB) preferred.
  • Understanding of high-speed digital data concepts is a plus.
  • Other programming skill sets such as setting up and interfacing a database, or numerical analysis is a plus.
  • Statistical tools such as Minitab or equivalent, familiar with Gage R&R, statistical process control etc.
  • Ability to handle multiple priorities involving external and internal priorities.
  • Ability to excel in a cross-organizational, cross cultural, global team environment.
  • Handle special assignments promptly and professionally.
  • Set a high standard of ethics, professionalism, leadership, and competency.

*** Demonstrates and promotes the II-VI Worldwide values:** Customer First; Honesty and Integrity, Open Communications, Teamwork, Continuous Improvement and Learning; Manage by the “Facts”; A Safe, Clean and Orderly Workplace. Individual Contributor

  • Adaptability, Customer Focus, Innovation, Planning and Organizing, Problem Solving, Decision Making and Continuous
  • Improvement, Professional and Technical Knowledge and Skills, Reliable and Dependable, Results Oriented, Teamwork and Position, Relationships, Work Standards/Quality/ Details.

Working Conditions

  • This role is 100% onsite

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.

Coherent is a global leader in lasers, engineered materials and networking components. We are a vertically integrated manufacturing company that develops innovative products for diversified applications in the industrial, optical communications, military, life sciences, semiconductor equipment, and consumer markets. Coherent provides a comprehensive career development platform within an environment that challenges employees to perform at their best, while rewarding excellence and hard-work through a competitive compensation program. It's an exciting opportunity to work for a company that offers stability, longevity and growth. Come Join Us!

Note to recruiters and employment agencies: We will not pay for unsolicited resumes from recruiters and employment agencies unless we have a signed agreement and have required assistance, in writing, for a specific opening.

Electrical EngineeringOpticsPhysicsTest AlgorithmSoftware CodingTest Bench SetupElectrical VerificationUSBI2CSPIGPIBHigh-speed Digital DataDatabase InterfacingNumerical AnalysisMinitabStatistical Process Control

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