Sr. Software Engineer, Data Security

  • 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

Data Security is core to Square’s success. Square strives to make the basics of running a business easy for our sellers so that they can instead focus on building and growing their business. The Data Security Engineering team similarly aims to make it easy for our engineering teams to protect sensitive data throughout its lifecycle so that Square can ship remarkable products. We achieve these goals through developing data security education and policies, preventative guardrails, and secure, convenient tooling. 


As a member of the Data Security Engineering team, you will: 

  • Contribute to the design and development of engineering solutions that support data security initiatives across Square’s engineering ecosystem

  • Collaborate with other engineering teams incorporating data security engineering products into their solutions

  • Act as an internal security subject matter expert, advocating for better security practices throughout Square

  • Contribute to the monitoring and stability of our team’s existing engineering solutions

  • Build large scale distributed systems that protect some of the most sensitive data in Square


Some qualifications you may have:

  • 3+ years of software engineering experience

  • Ability to break down complex requirements into smaller, more manageable pieces

  • Excellent technical communication skills

  • A high bar for writing quality, scalable, robust, and testable code

  • Willingness to cut across new or existing services, infrastructure, or frameworks to achieve data security goals


As a bonus, you may have experience or interest in:

  • Designing novel yet robust security architectures and protocols

  • Cryptography, common implementation errors, and safe abstractions

  • Explaining complex technical security concepts clearly

  • PCI security standards (including DSS and PTS)


Technologies we use and teach:

  • Java, Go, Python, Ruby

  • Envoy, Service Mesh, SPIFFE/Spire

  • gRPC, and Protocol Buffers

  • Google’s Tink Cryptographic library

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. Square 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

Square, Inc. (NYSE: SQ) builds tools to empower businesses and individuals to participate in the economy. Sellers use Square to reach buyers online and in person, manage their business, and access financing. Individuals use Cash App to spend, send, store, and invest money. And TIDAL is a global music and entertainment platform that expands Square's purpose of economic empowerment to artists. Square, Inc. has offices in the United States, Canada, Japan, Australia, Ireland, Spain, Norway, and the UK.

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