Senior Data Scientist
Senior Data Scientist
Posted on :
13-06-2025
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1 Vacancy
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Job Description
Refinery89 is looking for an experienced and highly analytical Senior Data Scientist to join our growing AI and Data team. If youre 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 want to meet you.
What Youll Do:
- 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.).
- Design and execute A/B/n experiments to test multiple parameter configurations simultaneously driving measurable improvements in system efficiency and revenue outcomes.
- Translate data and experimentation results into scalable production-ready solutions that integrate seamlessly with our product and engineering teams.
- Collaborate with cross-functional stakeholders from Product to Commercial to identify high-impact use cases and align technical outcomes with strategic goals.
- Own the end-to-end lifecycle of models: from ideation data wrangling development and deployment through to performance monitoring and optimization.
- Present complex findings in a clear and actionable way to both technical and non-technical audiences.
Who Were Looking For:
- Experienced Problem Solver: 5 years in data science or machine learning roles ideally in fast-paced digital or AdTech environments.
- Advanced Technical Proficiency: Strong in Python and SQL with proven experience in statistical modeling experimentation and ML libraries (e.g. scikit-learn TensorFlow PyTorch).
- Cloud Native: Familiarity with cloud environments such as AWS or Azure including experience deploying models in cloud infrastructure.
- Experimentation Expert: Hands-on experience designing running and analyzing A/B and multivariate tests with robust statistical rigor.
- Communicator & Collaborator: Youre equally comfortable in code and in a boardroom. You can explain complex results to a CRO and architecture decisions to an engineer.
- Business-Oriented Thinker: You understand that the success of an algorithm is not only in its accuracy but in its impact on product and revenue metrics.
Nice-to-Haves:
- Background in AdTech programmatic advertising or digital publishing.
- Experience with LLMs causal inference or real-time prediction models.
- Exposure to tools like Airflow Docker or Spark in a production context.
What You Can Expect from Us:
- Competitive salary package tailored to your experience.
- Bonus structure tied to impact and performance.
- Remote-first flexibility with access to a beautiful 800m office in central Madrid (Cuatro Caminos).
- 24 holidays per year your own equipment and weekly Friday half-days.
- A flat fast-moving and feedback-friendly culture inspired by our Dutch roots.
- Annual team retreat and regular knowledge-sharing sessions with our international team.
- A chance to work on real business problems build impactful AI systems and push the boundaries of whats possible in AdTech.
Ready to bring science to strategy and shape the future of advertising
Apply today and lets shape the future of programmatic advertising together!
Employment Type
Full Time
Key Skills
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