Manufacturing Test Engineer (China)

  • Shenzhen, Guangdong, China
  • Full-time

Company Description

We started with a simple idea - that everyone should be able to accept credit cards - and we’ve been rethinking buying and selling ever since. For sellers, we’re creating one cohesive service to run your entire business, from a register in your pocket to analytics on your laptop. For buyers, we’re making it faster to order from the businesses you love and more fun to pay your friends back. Buying and selling sound like simple things - and they should be. Somewhere along the way, they got complicated. We’re working hard to make commerce easy for everyone.

Job Description

As a Manufacturing Test Engineer, you are our eyes, ears, and hands in the factory for ensuring that our hardware test processes are reliable, repeatable, and maintainable.  You are able to contribute to the design of test processes that are efficient and scalable to support every phase of the product life cycle. You can triage and debug test station issues (both electrical and software), and direct factory processes (GR&R, DOEs, Factory Dry Runs, Prototype Builds).  You are a keen observer with good instincts and can alert the rest of the team when things look out of order. You are self-motivated with a desire for continuous improvement, but are comfortable asking questions when necessary. You are excited about being part of a close-knit, diverse team of engineers.

You will:

  • Become intimately familiar with Square's hardware products and manufacturing processes in order to support test strategies for the entire supply chain.

  • Serve as a technical liaison between the Manufacturing Test Team in San Francisco and our JDM/CM Factory Partners in China

  • Understand the meaning of the measurements our stations are taking, and feed analysis of these measurements back to our hardware design teams.

  • Provide on-site support during NPI and mass-production builds in China

  • Provide clear and effective build reports for test stations (Readiness during dry-run, cycle times and retest rates during builds, failure mode summaries)

  • Look for opportunities to make the test team (and the entire hardware team) more nimble.

  • Debug and update test station software

  • Debug electrical signal routing and signal conditioning with test fixtures

  • Identify possible risks of cosmetic damage caused by test fixtures

  • Reach beyond the boundaries of Manufacturing Test to make Square’s products better wherever you see the chance.

  • Maintain and build relationships with in-region Test Equipment vendors and contractors


You may or can learn to:

  • Work with Square’s Embedded Software group to specify embedded test access and APIs.

  • Collaborate with Electrical Engineering to understand their design intent, then translate this to DFt suggestions and a detailed electrical test plan.

  • Understand mechanical assembly process in order to recommend focused verification of high-risk or high-consequence assembly steps.

  • Own multiple factory-test stations from concept through mass production.

  • Design and fabricate mechanical test fixtures.

  • Design and validate PCBs for electrical signal routing and signal conditioning within your test fixtures.

  • Write test station software.

  • Architect test stations using generic building blocks that can be reused in future test stations.

  • Create automated systems to quickly collect feedback about our products’ performance in the factory and with our customers


You have:

  • Flexibility to thrive when task assignments are vague and ill defined.

  • Desire to continuously learn new things

  • 5 years work experience in Manufacturing Test Engineering for world-class products: either designing/building test stations or supporting factory test lines at contract manufacturers

  • Hands-on aptitude to make things work in EE, software, and/or ME realms:

    • Read EE schematics.

    • Correctly operate and interpret typical EE test equipment (DMM, Oscilloscope, Signal Analyzer)

    • Understand the spirit of software design principles and pragmatically apply those to debugging and maintaining factory test scripts.

    • Natural inclination to apply methodical engineering problem-solving skills to dig into challenges that are outside of your expertise.

  • Clear written and spoken English communication skills

  • Ability to analyze and visualize numerical data (basic knowledge of statistics, fluent in Excel, JMP, or other numerical analysis tools)

  • 4 year degree in EE, Computer Engineering/Science or related field (or equivalent on the job experience)

  • Ability to manage contract manufacturing test engineering partners to drive GR&R, DOE, and Factory Test Dry Runs to prepare for prototype NPI builds

  • Ability to create clear and effective reports (Build Reports, Station Issue Lists/MILs, SOPs, etc.)

  • Understanding of how to analyze GR&R data (both parametric and attribute/go no-go)


  • 5+ years' experience producing complex electronic products in high volume. Bonus points for consumer electronics.

  • Practical experience performing sensitive analog measurements in a high-volume factory environment. (RF, acoustic, optical, etc.)

  • Confirmed ability to write robust, extensible software in a variety of languages on a variety of platforms. (We work mostly in Python and C++ on Windows, Mac and linux.)

  • Real-world understanding of statistics/SPC.

  • Basic understanding of electrical signal integrity, especially as it applies to passing signals around in a noisy factory environment.

  • Working knowledge of functional test and ATE techniques (ICT, BSCAN, AOI, X-ray) for board-level assemblies (PCBAs).

Additional Information

At Square, we value diversity and always treat all employees and job applicants based on merit, qualifications, competence, and talent. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. We will consider for employment qualified applicants with criminal histories in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance.