Fullstack Software Engineer

  • San Francisco, CA, USA
  • Employees can work remotely
  • Full-time

Company Description

Since we first opened our doors in 2009, the world of commerce has evolved immensely – and so has Square. After helping anyone take a payment and never miss a sale, we saw sellers stymied by different, outmoded products and tools that wouldn't work together. So we expanded into software and started building integrated, omnichannel solutions – to help sellers sell online, manage inventory, run a busy kitchen, book appointments, engage loyal buyers, and hire and pay staff. And across it all, we've embedded financial services tools at the point of sale, so merchants can access a business loan and manage their cash flow all in one place.

Today, we're a partner to sellers of all sizes – large, enterprise-scale businesses with complex commerce operations, sellers just starting out, and merchants who began selling with Square and have grown larger over time. As our sellers scale, so do our solutions. We all grow together.

There is a massive opportunity in front of us. We're building a business that is big, meaningful, and lasting. And we are helping sellers around the world do the same.

Job Description

Square helps millions of merchants start and run their businesses. As those businesses grow, their needs change. Square’s goal to help businesses grow doesn’t stop when small businesses do well. We want to support the needs of businesses at all stages, from a seller taking their first sale, to corporations who have processed millions in payments. 

The Core Payments team within Payment Products focuses on improving the user experience for these merchants and on building new user-facing tools to help them get the right support at the right time. Our team is responsible for the experiences of more than half of our merchants. Our UI is one of the first things our customers see, and first impressions matter. Our products meet them where they need as they grow, providing the right experience when they need it. 

A few examples of the products that we work on:

  • New payment method integration

  • Transferring account ownership

  • Keypad enhancement and accessibility programs

We are a full-stack and mobile product team: we improve and integrate with the money moving platform and deliver product features on desktops, mobile web, and 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. Our team has excellent work-life balance, allows flexible hours and location, and works on important, valuable projects.


You will:

  • Design, create and optimize the payment product experience for businesses using Ruby on Rails, Ember.js, Java, AWS, and MySQL

  • Design and implement 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:

  • 2+ years of server-side experience, ideally in Rails or Java, and familiarity or curiosity about frontend and mobile development

  • Contributed to or led feature releases

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

  • Empathy for customers and an interest in producing an excellent experience for them

Technologies we use and teach:

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

  • A/B test techniques and methodologies

  • iOS and Android development

Additional Information

We’re working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is a proud equal opportunity employer. We work hard to evaluate all employees and job applicants consistently, without regard to race, color, religion, gender, national origin, age, disability, veteran status, pregnancy, gender expression or identity, sexual orientation, citizenship, or any other legally protected class. 

We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations to disabled applicants throughout the recruitment process. We encourage applicants to share any needed accommodations with their recruiter, who will treat these requests as confidentially as possible. Want to learn more about what we’re doing to build a workplace that is fair and square? Check out our I+D page

Additionally, we consider qualified applicants with criminal histories for employment on our team, assessing candidates in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance.


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

Block, Inc. (NYSE: SQ) is a global technology company with a focus on financial services. Made up of Square, Cash App, Spiral, TIDAL, and TBD, we build tools to help more people access the economy. Square helps sellers run and grow their businesses with its integrated ecosystem of commerce solutions, business software, and banking services. With Cash App, anyone can easily send, spend, or invest their money in stocks or Bitcoin. Spiral (formerly Square Crypto) builds and funds free, open-source Bitcoin projects. Artists use TIDAL to help them succeed as entrepreneurs and connect more deeply with fans. TBD is building an open developer platform to make it easier to access Bitcoin and other blockchain technologies without having to go through an institution.

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