Senior Software Engineer, Payment Authentication

  • Seattle, WA, USA
  • Employees can work remotely
  • Full-time
  • Alternate Location: San Francisco, United States
  • Position open to remote: Yes

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

As a software engineer on the Payments team, you will be responsible for designing, building, and maintaining the Payments Platform services and infrastructure that securely move money for Square. You will be deeply involved in the technical details of building highly available and reliable services, while also working with product teams to enable Square to rapidly build new capabilities for our merchants and buyers all over the world.

You will:

  • Work with engineering, product, and other partners to build software that is clean and forward-thinking

  • Design and develop modern APIs that integrate various surfaces with server backends

  • Drive engineering of well-designed, reusable and secure systems to advance payment acceptance and secure Square customers

  • Promote engineering best practices and help define technical roadmap for the team

  • Focus on operational excellence to deliver fault tolerant systems enabling team to move fast without negatively affecting our customers

  • Raise awareness and promote adoption of new authentication mechanism within Square and beyond


You have:

  • 5+ years of software engineering experience

  • BA/BS degree in Computer Science or equivalent practical experience

  • Experience in architecting, implementation and delivery of complex software solutions

  • Proven ability to collaborate effectively across multiple teams including product, data, marketing, providing technical guidance when needed

  • Broad understanding of security problems and risks and mechanisms to mitigate them

  • Strong desire to perform and grow as a technical leader and engineer

  • Demonstrated ability to mentor other engineers

Nice to have:

  • Experience working with JVM languages (Java, Kotlin, Scala, etc.)

  • Experience building frontend components using Javascript, React, Ember, or other frameworks

  • Experience working in payments industry

  • Experience or education in security or cryptography space

Technologies we use:

  • Java, Golang, Ruby

  • JavaScript, ES6, Ember, Sass, and other web-app frameworks

  • AWS, Docker, Kubernetes

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
  • Paid time off
  • Learning and Development resources