Block
SeniorMachineLearningEngineer,ModelRiskManagement
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“Senior Machine Learning Engineer, Model Risk Management at Block. Skills: Machine Learning, Model Risk, Validation. Challenge model owners. Reproduce model results”
What You'll Achieve.
Confirm output is reliable
Industry & Context.
Hunt silent errors; Reason about ML systems
What They're Looking For.
Must Have
Quantitative degree or equivalent experience, Senior-IC depth building or validating models, Command of effective-challenge methodology, Deep applied ML and statistics, Experimentation and statistical rigor, Solid software and data engineering, Production-quality Python, SQL on large datasets, Reproducible, tested code, Fluency with modern AI, Judgment to know when AI output can be trusted, Communication to explain and defend conclusions, Independence to operate under ambiguity
Nice to Have
Familiarity with model risk management frameworks, Familiarity with fair-lending standards
What You'll Do.
Challenge model owners
Reproduce model results
Defend acceptance thresholds
Work hands-on in codebases
Build agentic validation tooling
Reason about ML systems
Evaluate owner's design
Tie explainability findings
Tie fair-lending findings
Define how Block validates systems
How You'll Work.
Team & Collaboration
Partner widely; Work with modelers; Work with Legal; Work with Compliance; Work with fair-lending teams; Work with auditors; Work with bank partners
Communication Scope
Explain conclusions; Defend conclusions
Process & Methodology
Agile
Full Job Description
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 Block lends, moves money, and screens for financial crime at enormous scale, and one bad model can mean millions in credit losses, suspicious activity that goes unreported, or a fair lending violation. Model Risk Management is the independent function that decides whether a model is sound enough to put in front of customers and regulators. The failures that matter rarely announce themselves: a model can clear every headline metric and still be broken underneath. It can pass clean at launch and then quietly drift as the population shifts, until the loss it was supposed to prevent surfaces months later. The hard part is finding what looks right and is wrong, then proving it well enough to hold up under questioning. Much of the work arrives under-specified, so you scope it into a defensible plan, ask the questions that surface the real requirements, and defend your tradeoffs to the people who built the model you are challenging. The same scrutiny you apply to models applies to AI. We build the tooling that lets a lean team validate at scale, so you critically evaluate what it produces and own the evaluation that confirms its output is reliable enough to act on. That work matters most for the GenAI and agentic systems most teams have not figured out how to oversee yet. As a senior individual contributor, you lead throu
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