My client is hiring a Senior Product Data Scientist to play a senior, highly strategic role within their product data organization. This is a rare opportunity to sit at the center of product strategy, experimentation, and causal inference , with real influence on how data drives decision‐making at the executive level.

In this role, you'll lead the evolution of experimentation and measurement across the product, uncover non‐obvious insights from complex datasets, and help leadership clearly understand true impact—not just correlation.

You'll act as a trusted thought partner to Product, Engineering, Design, Finance, Marketing, and exec leadership while mentoring and leveling up other data scientists.

Key focus areas include: Owning and driving the experimentation roadmap across the product

Designing and analyzing advanced A/B tests, multivariate and Bayesian experiments

Applying causal inference techniques (DiD, synthetic controls,



PSM, IVs) when RCTs aren't possible

Building KPI and measurement frameworks that connect product metrics to business outcomes

Translating complex statistical findings into clear, actionable narratives for senior leadership

Partnering with Data Engineering to scale experimentation tooling and self‐serve analytics

What my client is looking for: 6+ years of experience in product data science, experimentation, or applied analytics

Deep expertise in causal inference and advanced experimentation methods

Strong Python or R, expert SQL, and experience with modern data warehouses

Proven ability to influence senior stakeholders and drive data‐driven change

SaaS and product-focused experience strongly preferred

📌 Senior Data Scientist (Madrid)
🏢 Harnham
📍 Madrid