Manufacturing Test Engineer

  • Shenzhen, China
  • Full-time

Company Description

Square builds common business tools in unconventional ways so more people can start, run, and grow their businesses. When Square started, it was difficult and expensive (or just plain impossible) for some businesses to take credit cards. Square made credit card payments possible for all by turning a mobile phone into a credit card reader. Since then Square has been building an entire business toolkit of both hardware and software products including Square Capital, Square Terminal, Square Payroll, and more. We’re working to find new and better ways to help businesses succeed on their own terms—and we’re looking for people like you to help shape tomorrow at Square.

Job Description

The Manufacturing Test Engineering team at Square is responsible for making sure that the millions of hardware devices leaving our factories are built according to design and meet (or exceed) customer expectations. We’re a diverse group of engineers that use our unique backgrounds to solve challenging problems in our factories. We dabble in electrical engineering, software, mechanicals and data analysis to understand the design intent of our products and understand how we can translate it to scalable test plans. We are Jacks and Jills of all trades, and we thrive on having a deep systems-level understanding of Square’s hardware products.

You Will

  • Become intimately familiar with Square's hardware products and manufacturing processes

  • Research technologies for our next-generation hardware products

  • Develop test plans and test-setup prototypes for new technologies

  • Work with Square's Devices Software Engineering group to understand embedded test access and APIs

  • Design, bring-up and maintain the hardware and software for test stations

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

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

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


You Have

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

  • Clear written and spoken English and Mandarin communication skills

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

  • Experience writing software in multiple languages on a variety of platforms. (We work mostly in Python and C++ on Windows, Mac and Linux).

  • Experience reading EE schematics, and operating typical EE test equipment (DMM, Oschilloscope, Signal Analyzer)

  • Understand software design principles and pragmatically apply those to writing, debugging and maintaining factory test scripts.

  • Basic knowledge of statistics, Excel (can perform complex functions), JMP, or other numerical analysis tools)

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

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

  • Experience writing clear reports (Build Reports, Station Issue Lists/Material Issue Lists, SOPs)

Even Better if You Have: 

  • Experience performing analog measurements (RF, acoustic, optical) including calibration and control of systematic errors

  • Experience working on electrical signal integrity in a noisy environment

Additional Information

At Square, our purpose is to empower – within and outside of our walls. In order to build the best tools for the businesses and customers we support all over the world, we have to start at home with a workforce as diverse and empowered as our sellers. To this end, we take great care to evaluate all employees and job applicants equally, based on merit, competence, and qualifications. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability status, or any other characteristic protected by law. We encourage candidates from all backgrounds to apply. Applicants in need of special assistance or accommodation during the interview process or in accessing our website may contact us by sending an email to assistance(at) We will treat your request as confidentially as possible. In your email, please include your name and preferred method of contact, and we will respond as soon as possible.


At Square, we want you to be well and thrive. Our global benefits package includes:

  • Healthcare coverage
  • Wellness perks
  • Paid parental leave
  • Paid time off
  • Learning and Development resources
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