Senior Full Stack Software Engineer, Security

  • San Francisco, CA, United States
  • Full-time
  • Alternate Location: New York, United States

Company Description

Block is one company built from many blocks, all united by the same purpose of economic empowerment. The blocks that form our foundational teams — People, Finance, Counsel, Hardware, Information Security, Platform Infrastructure Engineering, and more — provide support and guidance at the corporate level. They work across business groups and around the globe, spanning time zones and disciplines to develop inclusive People policies, forecast finances, give legal counsel, safeguard systems, nurture new initiatives, and more. Every challenge creates possibilities, and we need different perspectives to see them all. Bring yours to Block.

Job Description

As a full stack engineer on this team you will work on building remarkable software solutions to solve security problems! You’ll work on security visibility projects, serving Block’s developers by building engaging products that drive security risk visibility, and mitigation tools for product owners and their managers. 

This is a complex problem space, with the following long term mission:

  • Make it easy for the Security Organization to highlight security solutions, findings and best practices to the appropriate product owners

  • Make it easy for developer teams to mitigate product risk by supporting their current workflows and helping them make an informed decision about when and how to reduce risk

  • Surface data & metrics to measure how our rate of risk reduction is keeping up with new product initiatives in order to inform future prioritization for the Security Organization collectively

Note that previous security experience is not a requirement for this role

About the team:

The Security Command Center team is responsible for building and operating services and tooling that provide transparency into application risk across Block. We believe that security products should provide a great customer experience and work across the front-end and backend stack to enable that. Examples of services we build and maintain include:

  • ‘Last mile delivery’ issue management application for surfacing, tracking and allowing developers across Block to resolve actionable security issues

  • Security ‘scorecards’ service for surfacing risk score in various security domains

As a senior full stack engineer on this team you will:

  • Identify, scope and lead large technical projects supporting the above objectives

  • Build end-to-end internal user facing features for product owners

  • Influence our product roadmap by identifying the features that will drive user engagement and experience 

  • Collaborate with a team of Software and Security Engineers to serve our product teams

  • Participate in code and design reviews to maintain our high development standards

  • Evolve and improve existing backend systems to meet product iteration velocity while maintaining a high quality bar

  • Mentor other engineers and help to cultivate a fast growing team


  • 6+ years of software development or equivalent experience

  • Comfortable with front-end technologies (Typescript and React is a plus!)

  • Comfortable with backend technologies and experience in building backend services

  • Experience building user facing features and owning the whole stack.

  • Demonstrated technical initiative and leadership on previous projects

  • Ability to exemplify engineering best practices within yourself and export those to your team

Nice to have

  • Broad understanding of or interest in information security problems or application security

Tools we use and teach:

  • TypeScript, React.js

  • Java 11 including JUnit, Hibernate, and Guice

  • HTTP, JSON, gRPC, and Protocol Buffers

  • MySQL

  • Amazon Web Services


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. 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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