Senior Software Engineer - Fraud Risk

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

Marketplace under Cash App provides different payment products such as Buy Now, Pay Later (BNPL) or monthly payment options to customers. The Fraud Risk team builds scalable systems that power our modelers and decision scientists to develop and deploy strategies to battle fraudsters to ensure the health of the business. In addition, we build end-to-end customer experience for risk assessments.   As a member of the team, you will design, build and launch fraud risk products and features. We build our services over Cash App's ever-evolving infrastructure, and as a senior engineer on the team, you will embrace these changes and scale our tech stack to promote future evolvability. This is an exciting opportunity to make a direct, tangible impact on our product and work on projects that are critical to the business’s success. You'll be reporting to an Engineering Manager and working on a distributed team with members in the USA, Shanghai and Melbourne.

You Will:

• Be responsible for designing, building and managing the distributed services that manage Cash App Marketplace fraud risk
• Creatively solve challenging technical problems at scale
• Demonstrate high code quality, good test coverage and other engineering best practices 
• Work on impactful, multi-person projects that cross Engineering team boundaries
• Collaborate with product, analysts, and modelers on planning and implementing frictionless user experiences 
• Have autonomy to research and achieve outcomes with support when you need it
• Contribute to the growth of our development capabilities through mentoring and supporting fellow engineers

Qualifications

You Have:

• Bachelor or Masters in computer science or a related field 
• 5+ years of backend software development experience, passion for solving business problems with technology and approach creating end-to-end solutions with a ton of autonomy
• Experience with common technologies like Kafka, Redis or Cassandra and curiosity that compels you to learn new technologies, frameworks, and services
• Deep regard for testing and have experience with automated testing frameworks
• Alignment with Cash App's mission of economic empowerment

Tools we use and teach

• Python, Java, Kotlin
• Kubernetes, AWS
• Datadog, SumoLogic
• Hibernate, MySQL, Cassandra DB, DynamoDB
• HTTP, JSON, gRPC and Protocol Buffers
• Kafka, event-driven microservice architecture