Data Scientist (Medior)

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About Refinery89

Refinery89 is a leading AdTech company helping digital publishers maximize the value of their advertising inventory through advanced programmatic monetization technology. Headquartered in Madrid, with a diverse international team, we combine data, automation, and innovation to make digital advertising more transparent, efficient, and impactful.

We are looking for an experienced and highly analytical Data Scientist (Medior) to join our growing AI and Data team. If you're passionate about building intelligent systems that drive real business impact, thrive on solving complex problems, and want to shape the future of AdTech innovation, we'd love to meet you.

What You'll Do

1. Lead the development of advanced statistical and machine learning models to optimize key performance parameters across our platforms (timeouts, refresh rates, ad placement logic, etc.).

2.



Design and execute A/B/n experiments to test multiple parameter configurations simultaneously, driving measurable improvements in system efficiency and revenue outcomes.

3. Translate data and experimentation results into scalable, production-ready solutions that integrate seamlessly with our Product and Engineering teams.

4. Collaborate with cross-functional stakeholders—from Product to Commercial—to identify high-impact use cases and align technical outcomes with strategic goals.

5. Own the end-to-end lifecycle of models: from ideation, data wrangling, development, and deployment through to performance monitoring and optimization.

6. Present complex findings in a clear and actionable way to both technical and non-technical audiences.

7. Contribute to the continuous improvement of our data science practices, tooling, and experimentation frameworks.

Who We're Looking For

Experienced Problem Solver
- 2+ years of experience in Data Science,

📌 Data Scientist (Madrid)
🏢 Refinery89
📍 Madrid