Senior Software Engineer, Flows

  • Full-time
  • Alternate Location: Denver, United States

Company Description

It all started with an idea at Block in 2013. Initially built to take the pain out of peer-to-peer payments, Cash App has gone from a simple product with a single purpose to a dynamic app, bringing a better way to send, spend, invest, borrow and save to our millions of monthly active users. With a mission to redefine the world's relationship with money by making it more relatable, instantly available and universally accessible, at Cash App you'll have the opportunity to make a real-world impact with your career.

Today, Cash App has thousands of employees around the world with a culture geared toward creativity, collaboration and impact. We’ve been a distributed team since day one, and continue to value working across time zones and continents both remotely and in our Cash App offices.

Our offices are great, but many of our roles can be done remotely from the countries where Block operates. We tailor our experience to champion our employees’ creativity and productivity wherever they are.

Check out our locations, benefits and more at

Job Description

As a member of the Flows team, you will be responsible for expanding a core component of Cash App that powers over 50% of the customer experience. This entails scaling our current workflow orchestration system while working with mobile teams to create our next-generation platform. You are metrics focused and are passionate about creating distributed systems that make product development easier at scale.

You will:

  • Own and scale core product infrastructure with significant processing requirements
  • Develop primitives that enable and accelerate exciting new product features
  • Write well-tested code
  • Build incrementally and deploy daily
  • Contribute to the broader tech and open source communities


You have:

  • Boundless curiosity
  • Drive to root cause systems with many moving parts and take whatever steps are necessary to fix them
  • Demonstrated technical initiative and leadership on previous projects
  • Strong track record of learning and teaching as a mechanism to grow as an engineer
  • Ability to exemplify engineering best practices within yourself and export those to your team
  • 3+ years of software development experience

Technologies we use and teach:

  • Kotlin, Java
  • HTTP, JSON, gRPC, Protocol Buffers
  • Amazon Web Services (AWS)
  • OkHttp, Jetty, JUnit, Guice
  • DynamoDB, ElasticSearch
  • DataDog, SignalFx 

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, 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, and always assess candidates on an individualized basis.

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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