Senior Full-Stack Software Engineer, Payment Product

  • San Francisco, CA
  • Full-time

Company Description

We believe the economy is better when everyone has access. When everyone has room to grow. No one should be left out because the cost is too great or the technology too complex. We started with a little white credit card reader but haven’t stopped there. We’re empowering the independent electrician to send invoices, setting up the favorite food truck with a delivery option, helping the ice cream shop pay its employees, and giving the burgeoning coffee chain capital for a second, third, and fourth location. We’re here to help sellers of all sizes start, run, and grow their business—and helping them grow their business is good business for everyone.

Job Description

Payments is Squares core product and the foundation for the growth of many other Square products. Millions of merchants use the payments product for their business every day. The Payment Product team focuses on improving the end-to-end user experience for these merchants and on building new user-facing tools to help them better manage the payment aspect of their business.

A few examples of the products that we work on:

  • In-app Terminal, which is the payments experience in the Square POS app, often with a reader.

  • Card on File, which allows merchants to store buyers cards for future payments.

  • Instant Deposits, which enables merchants to immediately deposit their credit card sales in their bank for a fee.

  • Onboarding and new user experience for payment products.

  • Transaction and deposit reporting.

  • Referral program.

We are a full-stack product team: we improve and integrate with the money moving platform and deliver product features on web, as well as in our iOS and Android apps. Our approach is both customer-focused and data-driven: we talk to existing and prospective merchants, understand their needs and pains, and find opportunities to improve product experiences from data insights and A/B tests.


You will:

  • Design, create and optimize the core payment product experiences using Ruby on Rails, Ember.js, Java, and MySQL

  • Design, implement, and analyze A/B tests

  • Build extensive, reliable support for product data logging and metrics

  • Work closely with our product, engineering, analytics, and marketing teams

You have:

  • BA/BS degree or equivalent experience (6+ years preferred)

  • Experience working Full-Stack, ideally in Javascript and Java, and innate curiosity of mobile development

  • Significantly led or contributed to medium to large scale feature releases

  • History of leading and mentoring engineering teams to raise technical standards and achieve business goals

  • Excellent interpersonal skills that enable effective communication and collaboration with a variety of stakeholders

Technologies we use and teach:

  • Java, Javascript, Ember.js, MySQL, Protobuf, Ruby on Rails

  • A/B test techniques and methodologies

  • iOS or Android development


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 and always consider qualified applicants with arrest and conviction records, in accordance with 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.