Senior Software Security Engineer, Product

The Role
At Cash, security is everyone's responsibility, especially among engineering disciplines. Cash Security is a multidisciplinary team, closely aligned to the needs of the business. The team is composed of multiple engineering and governance teams, each specializing and collaboratively solving the security, privacy and governance needs alongside their partner organizations.
The Product Security engineering team focuses on protecting Cash App's customer data throughout the product engineering's technology stacks. This is a hands-on, engineering-driven security team, which aligns security engineers toward product teams, across the entire Cash App organization. They continually raise the overall trust of Cash App's products by building high leverage security abstractions into the technology stacks our partners utilize. They collaborate on building these security infrastructures, design patterns, and guidelines, and accomplish our goals by treating security engineering as a discipline, offering our expertise to technical and non-technical stakeholders. Secondarily, they abstract bespoke security solutions into reusable infrastructure, sharing our learnings, best practices, and solutions across the organization. This team's mission is to empower Cash engineers to protect our customers' data in every aspect of the product and data life cycle; by providing reusable primitives and scalable platforms.
You will:

• Work with product teams to threat-model Cash App features and identify vulnerabilities.
• Design, build, and own the security & privacy mechanisms and features which support product engineering teams and customer operations.
• Drive the direction of the organization by productionizing common security patterns and working toward our security roadmap.
• Design, apply, and develop security primitives to protect data.
• Identify and remedy potential security risks to our customers' data.
• Partner with product teams to implement relevant regulatory data privacy considerations.
• Help the engineers around you level-up on their own security reasoning and knowledge.

Examples of this team's previous work includes :

• CashApp's open source mobile client security SDK [ GitHub ]
• General purpose multi-party authorization framework
• Context aware audit logging functionality
• Drive the adoption of policy as code
• Cash's Field Level Encryption (FLE) framework [ Blog ]

You have:

• 8+ years of relevant experience
• Experience demonstrating technical initiative and leadership through the end-to-end delivery of products in the security space
• You enjoy solving problems at scale, through hands-on problem solving
• Strong desire to perform and grow as a security engineer and educate other engineers
• An interest in working on a product that impacts people/businesses directly
• You have an aptitude for applied cryptography, security, and strong software engineering fundamentals

Tools we use and teach:

• AWS KMS and Google's Tink Cryptographic APIs
• Android / iOS mobile development
• Java 11 including JUnit, Hibernate, and Guice
• Kotlin
• HTTP, JSON, gRPC, and Protocol Buffers
• MySQL, DynamoDB
• Operating microservices, Kubernetes, Terraform

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 an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We also consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.
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 .
Block will consider qualified applicants with arrest or conviction records for employment in accordance with state and local laws and "fair chance" ordinances.
Block takes a market-based approach to pay, and pay may vary depending on your location. U.S locations are categorized into one of four zones based on a cost of labor index for that geographic area. The successful candidate's starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future.
To find a location's zone designation, please refer to this resource . If a location of interest is not listed, please speak with a recruiter for additional information.
Zone A:
$198,000 - $297,000 USD
Zone B:
$188,100 - $282,100 USD
Zone C:
$178,200 - $267,400 USD
Zone D:
$168,300 - $252,500 USD
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.