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. 

The Role

As part of the Machine Learning Engineering Banking team, you will play a critical part in utilizing machine learning methods and systems to reduce the prevalence of fraudulent behavior within Cash's banking products and ecosystem. Our primary responsibility is fortifying our first line of defense against bad actors attempting to extract money from our customers or from the company. Areas that we own include Cash Card, Deposits and Withdrawals, and Dispute Claim Investigations. When we are successful, we build more trust within our customer base and allow for the continued expansion of safe products to give more economic empowerment to our customers. By leveraging machine learning, we aim to ensure that everyone has equal access to the financial services they require, irrespective of their background or financial history.

Specifically this role focuses on using machine learning to develop risk-based experiences that increases access for good customers, prevention of fraudulent transactions and activity on customer accounts, and ensuring that customers can trust that Cash App is a safe place to store their hard earned funds.

Our team is continuing to grow and we're looking for Engineers with experience developing ML pipelines and infrastructure to build out the next-generation ML solutions to power use cases across the company. Across the team, we employ methods ranging from simple heuristics, Machine Learning models, and utilization of Large Language Models (LLMs) to improve our performance and services. We're also excited to explore new directions with the team to continue pushing the boundaries of what's possible.

Our ML Engineers work in close collaboration with Data Scientists, ML Modelers and Software Engineers from across Cash App. Check out our Machine Learning / AI blog here!

You Will

• Design elegant ML pipelines and services as well as prototype new approaches and productionize solutions at scale for our 50+ million active users
• Create a world class platform for training, hosting and maintaining ML models
• Apply ML and engineering best practices to shape how Cash App develops, tests and maintains ML-platform solutions
• Help design and execute our long-term Machine Learning strategy across Cash App

You Have

• 5+ years of experience in software development and demonstrated technical initiative and leadership on previous machine learning projects
• Curiosity and a passion for Cash App's mission of economic empowerment
• Experience helping your teammates grow through mentorship and providing constructive feedback
• A desire to be hands-on and help invent the future of AI
• The ability to work autonomously in the rapidly evolving world of ML
• Experience or knowledge in ML is helpful but not a prerequisite: if you are a solid software engineer, then we are happy to train you in the mysterious ways of ML

Technologies We Use and Teach

• Python, Java and Kotlin
• Tensorflow and PyTorch
• AWS, GCP, and Kubernetes
• MySQL, DynamoDB, Kafka, Apache Beam, Flink and Google DataFlow

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 will consider qualified applicants with arrest or conviction records for employment in accordance with state and local laws and “fair chance” ordinances.

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.

While there is no specific deadline to apply for this role, U.S. roles are typically open for an average of 55 days before being filled by a successful candidate. Please refer to the date listed at the top of this job page for when this role was first posted.

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. 

Every benefit we offer is designed with one goal: empowering you to do the best work of your career while building the life you want. Remote work, medical insurance, flexible time off, retirement savings plans, and modern family planning are just some of our offering. Check out our other benefits at Block.

Block, Inc. (NYSE: XYZ) builds technology to increase access to the global economy. Each of our brands unlocks different aspects of the economy for more people. Square makes commerce and financial services accessible to sellers. Cash App is the easy way to spend, send, and store money. Afterpay is transforming the way customers manage their spending over time. TIDAL is a music platform that empowers artists to thrive as entrepreneurs. Bitkey is a simple self-custody wallet built for bitcoin. Proto is a suite of bitcoin mining products and services. Together, we’re helping build a financial system that is open to everyone.

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