Words are powerful. They can be used to lift people up, but sometimes are intended to cause harm. At Bumble Inc.— the parent company that operates Bumble, Badoo and Fruitz - we believe it’s unacceptable to be abusive in any form — online or offline. That’s why we’ve worked hard on a fully multilingual, machine learning-based toxicity detector within our platform that’s designed to protect our community from harmful messaging. During the talk we will cover some of the technical aspects and challenges of the year-long project that allowed us to build a reliable and scalable engine (that also powers the Rude Message Detector!), together with some interesting learnings we made opening the deep learning black box we trained.