Senior Data Scientist (f/m/d)

adjoe builds the technologies behind mobile apps growth and monetization. With our core product Playtime Arcade, we've become the global leader in rewarded advertising, an ad unit built on a simple premise: users earn real in-app rewards for engaging with new apps. The result is one of the most effective value exchanges in adtech, connecting advertisers and publishers with over 770 million users annually.

### Your Mission & Who We Are Looking For: - Proven track record in production ML. - You have 5+ years in Data Science with a history of deployed models that moved real business metrics, not just research that stayed in notebooks. - Deep learning is your primary tool. - You have strong hands-on experience with PyTorch or TensorFlow and have deployed deep learning models in production environments handling 1M+ daily predictions. - Full ML lifecycle ownership. - You own the problem end-to-end from extracting insights out of terabytes of behavioral data using Trino, Spark, or AWS Athena, through model development and A/B validation, to production deployment. - Fluent in both Python and data at scale. - You work comfortably with the core DS stack (pandas/polars, numpy, scikit-learn, LightGBM, CatBoost, XGBoost) and have advanced SQL skills for drilling into large distributed datasets. - Bridges ML and product. - You can translate product requirements into ML logic and explain model behavior and impact to non-technical stakeholders without losing the technical depth underneath.

### What’s in It for You? - 🌎 We welcome applications from talent worldwide and provide relocation support to Hamburg, Germany for those ready to join our team. - At adjoe, you’re not here to just close JIRA tickets, you’re helping build the infrastructure behind one of the most impactful platforms in adtech. The systems you work on will reach hundreds of millions of users and power billions of decisions every day.

- Go Big. - Own projects with impact on 770M users and push adtech boundaries. - Move Fast. - Ship solutions multiple times a day, learn from results, and keep momentum. - Be Direct. - Solve problems openly and collaborate across teams. - Thrive Together. - Grow with a diverse, global team of people from over 40 different countries that learn from each other. - Have Fun. - Celebrate wins, enjoy daily victories, and bring your energy.

adjoe is a leading mobile adtech platform that provides user acquisition and monetization solutions for app developers and publishers. The company offers innovative ad formats including rewarded ads (Playtime), programmatic video and banner ads, and its own ad mediation platform (WAVE).