Wallapop is a Barcelona based scale‑up that uses technology to promote conscious consumption across Spain, Italy and Portugal. We enable a connected trade ecosystem, making 2nd‑hand the norm through smart use of technology.
Role Overview
We are seeking an experienced Experimentation Lead who will own the evolution of Wallapop’s experimentation practice. This person will define experimentation standards, improve statistical rigor, increase the speed and quality of product decisions, and help product teams adopt a culture of evidence‑based decision making.
The role partners closely with Product, Engineering, Data Science, Analytics and Executive leadership to ensure experiments are designed, executed, analysed and interpreted consistently across the organization. The candidate will act as a hands‑on expert and internal consultant, helping teams answer questions about marketplace growth, personalization, search, discovery, trust & safety, monetisation and seller experience.
What You Will Do

Experimentation Strategy: Define experimentation vision and roadmap,



establish company‑wide standards, create frameworks for prioritisation and develop guardrail metrics and governance.
Statistical Excellence: Own methodology across the company and introduce advanced techniques (CUPED, sequential testing, network effect measurement, marketplace methods, quasi‑experimental designs, and incrementality measurement) to reduce decision latency.
Product Partnership & Enablement: Act as strategic advisor and coach to Data Analysts, Data Scientists and PMs on hypothesis development, experiment design and success metrics.
Education: Build experimentation curriculum, deliver training for PMs, Designers, Engineers and Analysts, and establish playbooks and office hours.
Platform & Tooling: Partner with Data Engineering and Analytics Engineering to improve infrastructure, evolve Amplitude Experiment data practices and define quality standards for exposure logging.
Marketplace Optimization: Desi

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