Senior Software Engineer, Online Payments Platform

  • San Francisco, CA
  • 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

Commerce is changing, and as part of that Square is transforming from a product company to a platform company. If you join now, you will ride the massive wave of omnichannel retail combining in-store and online / in-app payments. You'll help create an "AWS of Commerce" as our developer platform exposes core primitives for other companies to build on top of. And you'll have a great experience with our motivated, friendly, and diverse team.

Square leads the industry with our in-person payments solution - our free Point-of-Sale software and beautiful hardware. The Online Payments Platform team’s mission is to make Square the industry-leader in online payments as well. To do that, we’re building backend APIs, front-end components for the web and mobile apps, and supporting services for developers. We’re building services that must be both highly available and able to handle meaningful volume, as thousands of developers use our code to power the payments capabilities that millions of merchants depend on. We build the tools to make that not just possible, but also easy.  

As a software engineer on the Online Payments Platform team, you will…

  • Work cross-functionally with product, engineering, and design teams across Square to ensure a consistent and clear developer experience

  • Design and develop APIs that work for both 3rd party developers and Square’s first-party products

  • Explore new services, technologies, and approaches to ensure our services are always available and fast globally

  • Build experiences for thousands of developers and millions of Square Merchants

  • See the big picture to design robust experiences so the team can be brave and move fast, without showing a negative impact to customers


You Will:

  • Have a desire to build Square's developer platform, where we succeed when our merchants and developers succeed

  • Deeply enjoy writing and shipping production software

  • Have experience quickly prototyping complex ideas

  • Value collaboration - both within your team and across organizations - above all

  • Be interested in writing code in Go, and be willing to read and sometimes write some Java

  • Whether you have heard of "Lean Startup", "Customer Development", "Human centered design" or not, you have a deep desire to focus on delighting our customers

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. 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
  • Retirement Plans
  • Employee Stock Purchase Program
  • Wellness perks
  • Paid parental leave
  • Flexible time off
  • Learning and Development resources
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