Senior Software Engineer, Product Security

  • San Francisco, CA, USA
  • Employees can work remotely
  • Full-time
  • Alternate Location: San Francisco, United States

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

We are looking for a Senior Software Engineer, Security to join the Product Security Engineering team serving our Seller ecosystem to guide various security efforts through a mix of technical leadership and direct software contributions related to the needs of our Ecommerce platform, formerly Weebly.

Our Product Security Engineering team embeds hands-on Security Engineers within different organizations at Square to ensure secure products and infrastructure across the Seller ecosystem in order to allow merchants and buyers to grow and operate safely.

You will:

  • Take ownership of Ecommerce platform security efforts

  • Integrate the Ecommerce Platform with existing security offerings provided across the Square Security organization and introduce new solutions where needed

  • Work with other security teams and security partners to influence roadmaps and prioritization in areas such as:

    • Web Security, Application Security

    • Spam and product abuse

    • Credit card fraud

    • Authentication & Authorization

    • Cloud- and Network infrastructure

  • Identify opportunities to enable the whole Seller ecosystem to operate safely


You have:

  • 5+ years of relevant software engineering experience and 1+ year(s) of security-related experience

  • Experience in design and implementation of complex software solutions

  • Demonstrated technical initiative, and leadership

  • Broad understanding of security problems and mechanisms to mitigate them paired with up-to-date knowledge on network- and service infrastructure

  • Desire to perform and grow as a software engineer in the security space

  • The ability to mentor other engineers


Technologies we use and teach:

  • PHP, Golang

  • AWS, Docker, Kubernetes

  • Bonus for knowledge in SPIFFE/SPIRE & Envoy


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
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