Our Team

The SentiLink team brings together years of experience building fraud products.

Naftali Harris

Naftali Harris graduated from the University of Chicago with a degree in statistics after dropping out of high school. He subsequently joined the Stanford PhD program in statistics, where he was a Stanford Graduate Fellow. In his professional career, he designed the Titanic dataset for Kaggle and built tweet topic models at Twitter before managing the data science team at Affirm. At Affirm, Naftali was responsible for all production risk systems: his team’s credit and fraud models determined who was approved and who was declined. In his free time, he has a knack for getting his blog posts to the top of Hacker News.

Max Blumenfeld

Max Blumenfeld has manually fraud-reviewed over three thousand financial transactions as a risk analyst, verifying the identities of customers online and over the phone, and discovering new fraud vectors. After teaching himself to code in his spare time, he built production risk operations tools and fraud models, and eventually led Affirm’s fraud program. He takes a special interest in synthetic identities, document forgery detection, and account takeover prevention. He has consulted for some of the biggest banks in the world on money laundering and fraud prevention. Max graduated from the University of Chicago with degrees in math and economics.