The Role As a Staff Machine Learning Engineer on the Predictive Systems team, you will drive the technical strategy for ML and decisioning systems that address risk, fraud, and abuse across Block. Acting as a technical domain owner for Cash App, Square, and Afterpay, you will shape how AI solutions are architected, integrated, and operationalized. Your leadership ensures that risk management functions as an enabler for product velocity, allowing teams to deploy features rapidly while maintaining a trusted ecosystem.
You are accountable for the production lifecycle of these systems, orchestrating the convergence of data, features, models, and controls into scalable defenses. Operating at the ecosystem level, you will define durable abstractions and decisioning patterns that standardize risk strategies across diverse domains. You will also influence the roadmap of Block's core ML infrastructure, ensuring the platform evolves to meet the requirements of complex, high-volume decisioning workloads.
You Will - Act as a technical lead across multiple Risk ML engineering teams, setting direction for how ML and AI solutions are applied to fraud, abuse, and risk decisioning.
- Design and evolve real-time and batch ML systems that leverage Block's core ML platforms to deliver scalable risk solutions.
- Drive architectural decisions around feature usage, contextual signals, and ML-driven controls in partnership with modeling, product, and platform teams.
- Translate ambiguous risk problems into clear technical strategies and execution plans.
- Lead cross-team efforts to integrate new data sources, signals, and event hooks into production risk systems.
- Establish standards for data quality, observability, and correctness for ML inputs and decisions.
- Provide technical leadership during emerging threat and SEV scenarios, guiding rapid mitigation while preserving long-term system health.
- Influence ML and AI engineering practices across Risk, improving consistency, reliability, and velocity.
You Have - Extensive experience designing and leading large-scale ML systems with broad organizational impact.
- A proven ability to set technical vision and drive alignment across multiple teams and disciplines.
- Deep understanding of ML systems, data platforms, and real-time decisioning at scale.
- Strong judgment in navigating complex tradeoffs involving risk, trust, and product velocity.
- A history of mentoring senior engineers and developing future technical leaders.
- A systems-level mindset and a bias toward durable, high-leverage solutions.
Technologies We Use and Teach - Python, Java and Kotlin
- Tensorflow and PyTorch
- AWS, Databricks and Kubernetes
- MySQL, DynamoDB, Kafka, Spark
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 a proud equal opportunity employer. We work hard to evaluate all employees and job applicants consistently, based solely on the core competencies required of the role at hand, and without regard to any legally protected class. 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 an inclusive workplace? Check out our Inclusion & Diversity page Full-time employee benefits include the following:
- Healthcare coverage (Medical, Vision and Dental insurance)
- Health Savings Account and Flexible Spending Account
- Retirement Plans including company match
- Employee Stock Purchase Program
- Wellness programs, including access to mental health, 1:1 financial planners, and a monthly wellness allowance
- Paid parental and caregiving leave
- Paid time off (including 12 paid holidays)
- Paid sick leave (1 hour per 26 hours worked (max 80 hours per calendar year to the extent legally permissible) for non-exempt employees and covered by our Flexible Time Off policy for exempt employees)
- Learning and Development resources
- Paid Life insurance, AD&D, and disability benefits
These benefits are further detailed in Block's policies. This role is also eligible to participate in Block's equity plan subject to the terms of the applicable plans and policies, and may be eligible for a sign-on bonus. Sales roles may be eligible to participate in a commission plan subject to the terms of the applicable plans and policies. Pay and benefits are subject to change at any time, consistent with the terms of any applicable compensation or benefit plans.
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:
$276,800 - $415,200 USD
Zone B:
$276,800 - $415,200 USD
Zone C:
$276,800 - $415,200 USD
Zone D:
$276,800 - $415,200 USD
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.
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