Senior Data Scientist

💪🗣 About BoldVoice BoldVoice (YC S21) is an AI-powered communication coach that helps non-native English speakers improve their pronunciation, clarity, and confidence. The app combines video lessons from Hollywood accent coaches with instant AI feedback as you speak, powered by our proprietary speech models.

It has been downloaded by 5M+ users globally, is one of the top Education apps on the App Store, and has been featured in Forbes, TechCrunch, Wired, and Business Insider. We recently raised a $21M Series A led by Matrix Partners, with Flybridge, XFund, and Y Combinator.

We're a small, fast-moving team with a mission to help 1 billion people speak English clearly and advance their careers. 📊

About the Role

We're looking for our first Data Scientist to own how BoldVoice measures itself and decides what to build next. This is not a reporting role.

You will be the person who decides what "working" means for a feature, designs the experiment that tests it, calls the result honestly, and then digs into the data to find the next thing worth building.

You'll sit at the intersection of product, growth, and our speech ML team, and your analyses will directly change the roadmap. There is a large, unusually rich dataset waiting for you: many users, tens of millions of scored speech attempts, 100+ native language backgrounds, and a full consumer subscription funnel.

👩‍💻👨‍💻 What you'll do Own experimentation end to end: help design A/B tests, choose the metrics up front, run the analysis with proper statistical rigor, and make the call on what ships Build and own the metric layer the whole company runs on: activation, trial start, trial to paid conversion, retention curves, LTV, and learning outcomes Run the deep dives that change the roadmap.

Why do speakers of one native language retain twice as well as another? Which lessons actually move pronunciation scores? What separates a user who sticks around from one who churns in week one? Turn behavioral and speech-scoring