Senior Full Stack Software Engineer, Developer Platform

  • Full-time

Company Description

We believe everyone should be able to participate and thrive in the economy. So we’re building tools that make commerce easier and more accessible to all. We started with a little white credit card reader but haven’t stopped there. Our new reader helps our sellers accept chip cards and NFC payments, and our Cash app lets people pay each other back instantly. 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. Let’s shorten the distance between having an idea and making a living from it. 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 Developer Platform team is responsible for APIs that external developers use to build apps on Square's platform and enabling all internal teams to have public APIs. We provide third party developers with the tools to create solutions for both existing Square merchants and entirely new customers. Our engineering team has one simple but lofty goal: convert Square from a product company into a platform company. Everything you will do on our team is a major strategic initiative for the company. This senior position is for a full stack engineer to help grow and lead the team as we expand dramatically this year. You need to enjoy owning and working on front end aspects such as delivering a breathtaking web and javascript experience to our external developers. Additionally, you will own full stack services critical to the platform strategy. Join this small team and build extraordinary web applications, flexible frameworks, and developer SDKs that are reliable, fast, responsive, and beautiful.

You will:

  • Build a great user experience

  • Work cross-functionally with our product teams, many other engineering teams, and partner with developers to design and implement Square’s global developer platform

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

  • Figure out the application infrastructure to support our web apps

  • Develop on top of rich, complex MVC frameworks

  • Test your code rigorously, and with automation

  • Build and expand core Rails services

  • Follow agile practices

  • Tweak your code to get the design exactly right

We are a small, focused, and rapidly growing team with an abundance of growth and impact opportunities. Our products and responsibilities include:

  • APIs and SDKs for eCommerce and the Register Point of Sale

  • Building infrastructure that makes it easy, scalable, and consistent to expose Square's products to external developers

  • An App Marketplace that helps millions of merchants integrate solutions for their business, and helps developers reach a technology companies building entire businesses on top of the Square Platform

  • Maintaining the availability, growth, architecture, and scalability of all public APIs

You will be responsible for designing, building, and owning the customer facing front-end products and services that power all of the above.

Qualifications

You have:

  • The ability to write JavaScript, both in its raw form and with common JS libraries

  • An enjoyment of building elegant Rails apps to rapidly create developer and merchant facing products

  • You can straddle client and server development, creating APIs that drive web apps (we use with Rails, Go, and some Node)

  • Exposure to the recently popular JS-app frameworks Ember, Angular, React, etc.

  • Experience testing your code with QUnit, Mocha, Jasmine, etc

  • Know how to tease out the right HTML and CSS or SASS for a given design

  • Experience working with product and design to rapidly and iteratively prototype

  • An understanding of how the web works and can make pragmatic engineering decisions from that knowledge

  • Innate curiosity and a desire to be responsible for all aspects of building Square's developer platform in a small, highly focused, and very rapidly growing team

  • You must deeply enjoy writing and shipping production software.

And even better:

  • Experience with Ember, d3, or Golang

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

  • Interest in open source and early adoption of future standards (ES6, W3C web payments standards, etc.)

Technologies we use and teach:

  • Responsive web development

  • Ember, Angular, d3, jQuery, Underscore, CoffeeScript, Sass, and other web-app frameworks

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.

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