Senior Software Engineer (Fullstack/Frontend), Business Banking

  • San Francisco, CA
  • Full-time

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

When our sellers make a sale, the Business Banking team helps them manage their business finances with products including Square Card, Instant Transfers, advanced reporting, and cash flow insights. With this suite of products, we ensure that our customers get access to the funds they need when they need them, and that they can always understand and control where their money is going. We partner with platform and infrastructure teams to move billions of dollars each year on behalf of our sellers.

We are a product-focused engineering team with a full-stack background. Our projects use data-driven decisions to deliver features across mobile and web frontends. We also talk directly to merchants about their needs and pain to identify opportunities to improve their experience. Our team enjoys working together to contribute to meaningful work seen by millions of merchants worldwide. As a member of the team, you’ll work collaboratively with mobile, backend and frontend-focused engineers to deliver high-value banking features to Square sellers.

You’ll build excellent front-end experiences within our web-based products, help develop and scale backend services, and contribute to the future of banking.

You will:

  • Help brainstorm solutions and build systems to solve customer problems
  • Build and maintain new UIs and product workflows in JavaScript
  • Design, implement and refine A/B tests
  • Design and optimize the payment product experience using Java and MySQL
  • Operate and scale a growing product that is important to our sellers
  • Build reliable support for product data logging and metrics
  • Work with our product, engineering, analytics, and marketing teams


You have:

  • BS/BA degree or equivalent experience
  • Programming skills

Nice to have:

  • Experience contributing to medium to large-scale feature releases
  • 5+ years of experience with JavaScript, Java or Ruby
  • Knowledge of payments or FinTech

Technologies we use and teach:

  • Ember.js, Java, MySQL, Ruby on Rails, Go and more
  • A/B test techniques and methodologies

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.