Design deploy and maintain end-to-end ML-driven risk solutions at scale to detect and prevent fraud abuse and credit risk. Lead technical decisions build ML tooling and processes apply state-of-the-art models and third-party data investigate emerging risk patterns and collaborate with platform and cross-functional teams to ensure reliable real-time model operation.

Block builds simple powerful tools that make progress towards an economy that's truly open to all. 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. Join us.
The Role
We're hiring Senior and Staff Machine Learning Engineers to join Block's Risk Machine Learning organization where teams apply ML at massive scale to detect prevent and reduce fraud and abuse across Cash App and Square.
This opening supports multiple senior-level roles with team placement determined through a collaborative matching process based on your experience interests and current business needs. Today we're growing teams focused fraud & abuse prevention merchant risk credit underwriting (consumer & commercial lending) buy-now-pay-later decisioning AI-powered customer support & conversational AI agentic automation for investigations and model risk governance. We'd love to hear from you whether your background is in adversarial ML NLP/LLMs credit modeling or model validation.
Across teams your work will directly protect our ecosystem reduce financial loss and enable safe seamless financial experiences for millions of customers sellers and families.
You Will

• Partner with product engineering data science policy and operations to design and productionize ML-driven risk solutions at scale
• Own end-to-end machine learning systems - from problem definition and modeling to deployment monitoring and iteration
• Lead technical decision-making within your workstreams and influence ML strategy and planning
• Build tooling and processes that improve the speed reliability and impact of the ML development lifecycle
• Apply state-of-the-art modeling techniques and third-party data sources to improve detection and decision-making
• Investigate emerging fraud abuse and risk patterns to proactively inform product safeguards and policy
• Collaborate closely with ML platform and engineering teams to ensure models operate reliably in real time and at scale

You Have

• 8+ years of industry experience in machine learning applied AI or related fields
• Bachelor's degree in a quantitative field (Computer Science Engineering Statistics Physics Applied Math); Master's or PhD preferred
• Proven experience independently designing deploying and maintaining ML solutions in production
• Strong familiarity with techniques such as tree-based models deep learning transfer learning or reinforcement learning
• Experience influencing technical direction and collaborating with cross-functional partners at scale
• Strong communication skills sound judgment and an ownership mindset
• Curiosity and alignment with Block's mission of economic empowerment

Technologies We Use and Teach

• Python (NumPy Pandas scikit-learn XGBoost PyTorch TensorFlow/Keras)
• PySpark MLflow workflow orchestration tools (Airflow Prefect)
• GCP (Vertex AI) AWS
• Snowflake MySQL Tableau Mode
• Containerization CI/CD and production ML best practices

Application Guidelines
Candidates may submit up to 9 active applications within a 60-day period. Reapplications to the same role are accepted 90 days after a previous application has been reviewed.
Use of AI in Our Hiring Process
We may use automated AI tools to evaluate job applications for efficiency and consistency. These tools comply with local regulations including bias audits and we handle all personal data in accordance with state and local privacy laws.
Contact us here with hiring practice or data usage questions.
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.