The Role

The Risk Signals and Controls team's mission is to power Block's risk decisions with trusted signals and lean, effective models built on evolving data. We do that by building efficient tools and workflows to accelerate fraud detection and model effectiveness evaluating thousands of transactions per second in real time. We closely collaborate with ML Modellers and Software Engineers from across Block to optimize the signal lifecycle to improve signal quality, reduce noise, and accelerate time-to-insight. We're also excited to explore new directions with the team to continue pushing the boundaries of what's possible.

You Will

Design, build, and maintain data pipelines to ingest third parties and Block data to enhance our feature store and modeling capabilities.
Design elegant ML pipelines and services, prototype new approaches, and productionize solutions at scale.
Build tooling to help maintain our features and models, gaining efficiencies in fraud detection.
Work hand-in-hand with ML Modelers to identify and integrate new data sources, heuristics and models.
Solve challenging technical problems at scale, collaborating with colleagues located across the globe
Apply ML and engineering best practices to shape how Block develops, tests, and maintains ML-platform solutions.
Ensure data quality and completeness through automated validation, monitoring, and alerting.
Own your solutions from design through to operation: we all share the pager!

You Have

12+ years of experience in software development and demonstrated technical initiative and leadership on previous machine learning projects.
A proven ability to shape how teams effectively adopt and evolve AI practices; driving adoption of AI-first workflows by coaching leaders, identifying scalable use cases, and embedding quality and accountability in team norms.
Work autonomously in a fast paced, ambiguous and unpredictable environment
Natural curiosity & eagerness to learn
Show the ability to take initiative, lead, and drive creative solutions in cross-team contexts.
A strong interest in owning your solutions, maintaining and fixing them as necessary
Communicate via clear and concise writing to facilitate asynchronous collaboration across multiple time zones
Reason about complex, distributed systems at high scale
Proficiency in machine learning techniques, experimental design and data engineering
Strong programming skills in languages such as Kotlin, Python, TensorFlow, or PyTorch

Technologies We Use and Teach

We value general engineering skill and versatility over existing domain knowledge, but here's a sample of what we currently use:

Python, Java and Kotlin
HTTP, JSON, gRPC, Protocol Buffers
AWS, Databricks, and Kubernetes
MySQL, DynamoDB, Kafka, Spark
Prefect, Airflow

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 at 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.

Staff Machine Learning Engineer, Risk Signals & Controls

Job Type