Senior Software Security Engineer

Company Description

It all started with an idea at Block in 2013. Initially built to take the pain out of peer-to-peer payments, Cash App has gone from a simple product with a single purpose to a dynamic ecosystem, developing unique financial products, including Afterpay/Clearpay, to provide a better way to send, spend, invest, borrow and save to our 47 million monthly active customers. We want to redefine the world’s relationship with money to make it more relatable, instantly available, and universally accessible.

Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact. We’ve been a distributed team since day one, and many of our roles can be done remotely from the countries where Cash App operates. No matter the location, we tailor our experience to ensure our employees are creative, productive, and happy.

Check out our locations, benefits, and more at cash.app/careers.

Job Description

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. 

About Product Security Engineering:

The product security engineering team focuses on protecting Cash App’s customer data throughout the product engineering’s technology stacks. We are a hands-on, engineering-driven security team, which aligns security engineers toward product teams, across the entire Cash App organization. We continually raise the overall trust of Cash App’s products by building high leverage security abstractions into the technology stacks our partners utilize. We collaborate on building these security infrastructures, design patterns, and guidelines. We accomplish our goals by treating security engineering as a discipline, offering our expertise to technical and non-technical stakeholders. We secondarily abstract bespoke security solutions into reusable infrastructure, sharing our learnings, best practices, and solutions across the organization.

Our 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.

As a Product Security Engineer, you’ll work within the product engineering organization to:

• Co-design, co-build, and co-own the security and privacy mechanisms and features which support the internal engineering teams and customer operations. 
• Design, apply, and develop security primitives to protect data.
• Help identify and remedied potential security risks to our customers' data.
• Understand how to apply and advise product teams on security requirements to the product’s implementation and how specific regulatory data privacy considerations may be relevant.
• Drive the direction of the organization by productizing common security patterns and working toward our security roadmap.
• Help the engineers around you level-up on their own security reasoning and knowledge.

Examples of our previous work: 

• 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]

Qualifications

You have:

• A strong motivation to contribute to a meaningful product that will fundamentally change the way people interact with financial institutions
• 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
• Demonstrated technical initiative and leadership
• Enthusiastic about distributed workforces and effective at working asynchronously
• An interest in working on a product that impacts people/businesses directly
• You have an aptitude for 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

Additional Information

Block takes a market-based approach to pay, and pay may vary dep