OverviewAs 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 / BeneficiosGenerous individual learning budget

Private Health Insurance

Adaptable working hours

Relocation package

26 holidays per year

Wallapop Renta (tax income support)

ResponsabilidadesDefine 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 principales8+ 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