Senior Software Engineer (Front-End), Terminal Web Checkout

  • San Francisco, CA, USA
  • 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

The Terminal Web team is building the next generation with point-of-sale, and our products and services are mainly built for the web. Engineers on this full stack team build the front-end features to create a seamless experience for our merchants and own underlying backend components that power them.

We’re seeking a front-end engineer who is passionate about building applications to help our merchants simplify their business processes and day-to-day work. Some of our products include Order building and WebCheckout, integrating with hardware, leveraging new technologies to connect hardware to the browser. Virtual Terminal allows merchants to accept Card Present, Card Not Present and Card on File payments directly on their computers.


You have:

  • The ability to write JavaScript, both in its raw form and with common JS libraries (jQuery, Underscore, etc.)

  • Familiarity with popular JS-app frameworks (Ember, React, Vue.js, Angular, etc.)

  • Innate curiosity and desire to build products that people depend on

  • A strong sense of customer empathy and desire to influence the product direction

  • An understanding how the web works with experience developing applications and can make pragmatic engineering decisions

  • 5+ years professional experience

Bonus points if you have:

  • A record of pursuing self directed side projects, research, or open source projects

  • You have experience or interest in learning A/B test design, growth, analytics, machine learning, systems

Technologies we teach and use:

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

  • Testing frameworks like (QUnit, Mocha, Jasmine, etc.)

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.