Senior Software Engineer - Banking Services

  • 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 enabling anyone to take a payment and never miss a sale, we saw sellers stymied by disparate, 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, as well as 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's Payment Platform is an open, global financial services platform for developers who serve our merchants. As a software engineer on the Financial Account team, you will be responsible for designing, building, and maintaining critical services and infrastructure that calculate balances and move money for Square. You will coordinate with product and partner teams across Square to design and launch new Financial Account APIs for internal and external use, and you will be deeply involved in the technical details of building highly available and reliable services that enable new capabilities for our sellers and buyers all over the world.


You will:

  • Build and evolve essential systems within our payments platform, used by the organization and an important strategic asset of Square.
  • Design high-volume, low-latency, distributed transaction processing systems, making thoughtful trade-offs between consistency and availability when both are not possible.
  • Abstract away the established APIs of the financial world into developer-friendly service APIs for Square's products to build upon.
  • Build systems that manage customers' sensitive data and hold Square to the highest standards for security and compliance.
  • Design, develop and launch new Financial Account APIs for use by 3rd party developers and Square Sellers.
  • Ensure our systems have layers of problem detection and mitigation tools so our merchants always get their deposits.
  • Work with our product, business, and finance teams to develop Square’s global payments strategy.

You have:

  • 5+ years of software development experience in Java, Python, or similar
  • Strong product intuition and interest, with platform-building experience
  • Tactical and strategic leadership experience on medium/large-scale software projects
  • Experience creating available, scalable, low-latency global systems
  • Interest in changing the payments landscape in the US and globally
  • Interest and experience in mentoring other engineers
  • [Bonus] Experience working with financial systems

Technologies we use and teach:

  • Java, Kotlin
  • Python
  • RESTful APIs, gRPCs, Guice (for dependency injection), Guava, Protocol Buffers, jOOQ
  • AWS SQS, Lambda, DynamoDB, Elastigraph, MySQL
  • GCP Spanner, Kubernetes
  • JIRA, SignalForm, PagerDuty, LaunchDarkly, Chronosphere

Additional Information

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

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.

Privacy Policy