Frictionless strong authentication is a critical driver for enabling ecommerce and many other modern technology systems to thrive. In this talk, I showcase the challenges of tackling modern sophisticated machine based attacks and other malicious human activity attempting account takeover using stolen or compromised credentials. This is followed by a quick dive into the engineered solution that can perform behavioral analytics utilizing biometric data and how it tackles machine learning problems at the scale of hundreds of millions of authentication attempts. Insight is provided into implementation challenges, machine learning model generation, and finally integration into a very complex ecosystem. This talk will also showcase wins and how this eventually enabled a zero-trust environment.