Overview As Experimentation Lead, you will own Wallapop’s experimentation practice and raise the bar for evidence-based product decisions. You’ll define standards, governance, and a roadmap to accelerate reliable insights across Product, Engineering, Data Science, Analytics, and Leadership. You’ll act as hands-on expert and internal consultant on growth, personalization, search, trust & safety, monetization, and seller experiences. Join a mission-driven team shaping a connected trade ecosystem with scalable experimentation. Compensaciones / Incentivos * Generous individual learning budget * Private Health Insurance * Flexible working hours * Relocation package * 26 holidays per year * Wallapop Renta (tax income support) Responsabilidades * Define and harmonize experimentation standards, vision, and governance across the company * Lead the development of advanced statistical methods and guardrails to speed and improve decision quality * Coach and partner with Data Analysts, Data Scientists, and PMs on hypothesis design, experiment setup,



and metrics * Build and deliver an experimentation curriculum, playbooks, and training for cross-functional teams * Collaborate with Data/Analytics Engineering to improve data infrastructure and exposure logging * Design experimentation approaches for search ranking, recommendations, personalization, marketplace dynamics, and monetization Requisitos principales * 8+ years in data science, product analytics, or causal inference * at least 4 years focused on experimentation (design, inference, A/B testing, variance reduction) * Strong SQL proficiency and experience with Python or R * Proven ability to partner with Product and influence senior stakeholders * Leadership experience building experimentation cultures and coaching teams * Excellent communication skills * strong business judgment * coaching and mentoring * cross-functional collaboration * SQL * Python or R * experimental design

📌 Staff Data Scientist, Experimentation (Barcelona)
🏢 Wallapop
📍 Barcelona