Senior Software Engineer (Python) - Developer Experience

  • 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

Developer Experience is a growing internal team that serves developers working with Square hardware devices. We develop internal software, firmware tools, test software infrastructure, and developer infrastructure to serve our internal customer teams. Some of our customer teams are the Android OS team, embedded software teams, factory team, and testrack team.

As a Senior Software Engineer on Developer Experience, you will oversee the test infrastructure workstream. You will provide technical guidance to our team and partners on how to build software that supports our hardware-in-the loop testing.


Your day-to-day responsibilities will include:

  • Building and maintaining software test platforms for hardware-in-the loop testing
  • Working closely with other DX engineers on our firmware and software tools
  • Giving technical direction to our projects
  • Being a mentor for other engineers on the team

You have:

  • 8+ years of software development experience
  • The ability and passion to discover and drive projects that increase developer velocity
  • Ability to drive collaboration across teams and disciplines to advance organizational goals
  • A passion for building and shipping internal tools and products and working directly with internal customers to rapidly improve their development experience
  • Ability to influence other senior leads to make progress on projects that aren’t purely executed by our team
  • Expertise in Python development, SDLC, and best practices
  • Experience with a Python test framework like Pytest

Even better if you have experience with the following:

  • Embedded firmware development
  • AOSP development
  • Testing and tooling
  • Developing virtualized build environments using technologies such as Docker, Vagrant, Packer, Terraform, and AWS
  • A wide range of software development experience ranging from web applications, command line tooling, data visualization, automated tests, and test frameworks

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.

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