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 / Beneficios

Generous individual learning budget Private Health Insurance Versátil 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 - Wallapop (Barcelona)
🏢 Wallapop
📍 Barcelona