Senior Software Engineer, Security

We work to guarantee the security of every transaction from dip and tap to receipt. Our ultimate goal is to ensure that there is no possible way to use Square insecurely. In the Mobile Security group, we work to fluidly interpret signals from what could be a compromised or hostile environment - the OS and app running our code. We build workflows, both human and machine, to swiftly judge the requests for privilege that come with those signals, and we hunt the malefactor where they work.

An example of this is our work to support and validate PIN-on-Glass, the ability of our apps to receive entry of a customer PIN after an EMV card dip into our reader. This is a hugely constrained and sensitive transaction, controlled previously entirely by the banking industry, into which we were not only able to introduce our low-cost, easy-access product, but to also influence the industry itself and its newest standards.

We look for software engineers who understand both security and the human cost of securing a digital border. We need people who recognize that a false positive is a frustrated customer, that an engineer’s investigations are a limited commodity, and that threats are not always what they seem. We cannot succeed without elegant and scalable tooling, which is what you will build.

You will:

• Lead and contribute to projects that span the following:

  • Signals processing and secure operations on mobile devices

  • Security incident review

  • Information flow and efficiency modeling

  • Case management user interfaces and backends

  • Applied machine learning in security contexts

  • Native library development for Android and iOS apps

  • Utilize software protection technologies including obfuscation, tamper detection, and whitebox cryptography

You have:

• 8+ years of industry experience

• A background in software engineering with a deep passion for making all things efficient

• Interest in working across multiple technical domains, including backend microservices and iOS/Android clients

• Strong examples of secure and elegant software development on production systems

• Demonstrated experience developing, deploying, and monitoring systems for managing and scaling security investigations, judgements, and actions

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, 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.

Additionally, we consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.

Perks

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.