Software Engineer, Product Security

  • Denver, CO
  • 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

The Product Security Engineering team identifies and mitigates unacceptable risk to Square’s products in order to protect our users. We engage in cross-functional collaboration across a wide range of organizations in order to implement security mechanisms into the company’s tech stack. We rely on data to scope problems, work with multiple teams to understand what solution will make the best impact, and drive the delivery from design to implementation.

We are excited to hire a Senior Software Engineer, Security to lead our efforts aimed at protecting Square’s APIs. In this role, you will work with different groups across the company to address a set of ambiguous security challenges by collecting and analyzing data, proposing solutions in the form of engineering designs based on the findings and own the delivery.

You will:

  • Identify conceptual security risks across our API endpoints in the area of authN, authZ as well as network level attacks

  • Scope and design solutions that protect Square’s APIs throughout their lifecycle

  • Implement reliable software within our network stack or related systems

  • Influence stakeholders across teams to get buy-in for your solution

  • Evaluate potential vendor solutions when applicable, make build vs. buy recommendations

  • Act as a force multiplier when driving projects in a collaborative environment


You have:

  • Deep knowledge about network & internet security challenges and how to address them

  • The ability to break down complex projects into components or milestones that can easily be completed by other engineers

  • Software development experience in Java, Go, or C++

  • Experience leading or overseeing large projects from start to finish

  • Built and operated highly available distributed systems

Nice to have:

  • Operated and debugged proxy technologies like Envoy or similar (e.g. Nginx, HAProxy)

  • Familiarity with some of the following technologies we use every day: AWS, GCP, Kubernetes, gRPC, Envoy, GraphQL

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.


At Square, 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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