ppWallapop 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. /p h3Role Overview /h3 pWe 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. /p pThe 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. /p h3What You Will Do /h3 ul libExperimentation Strategy: /b Define experimentation vision and roadmap, establish company‑wide standards, create frameworks for prioritisation and develop guardrail metrics and governance. /li libStatistical Excellence: /b 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. /li libProduct Partnership Enablement: /b Act as strategic advisor and coach to Data Analysts,



Data Scientists and PMs on hypothesis development, experiment design and success metrics. /li libEducation: /b Build experimentation curriculum, deliver training for PMs, Designers, Engineers and Analysts, and establish playbooks and office hours. /li libPlatform Tooling: /b Partner with Data Engineering and Analytics Engineering to improve infrastructure, evolve Amplitude Experiment data practices and define quality standards for exposure logging. /li libMarketplace Optimization: /b Design experimentation approaches for search ranking, recommendations, personalization, marketplace liquidity, supply‑demand dynamics, seller growth, trust safety and ad monetisation. /li /ul h3What We’re Looking For /h3 ul libTechnical Expertise: /b 8+ years total experience in data science, product analytics or causal inference, with at least 4 years focused on experimentation. /li libTooling Code: /b Strong SQL proficiency and experience with Python or R. /li libProduct Partnership: /b Proven ability to partner directly with product organisations and influence senior stakeholders. /li libLeadership: /b Demonstrated success building experimentation cultures, coaching PMs and analysts and excellent communication skills.



/li /ul h3Preferred /h3 ul liExperience with Amplitude. /li liExperience working in marketplaces, e‑commerce, consumer internet or two‑sided platforms. /li liExperience with recommendation or search systems. /li /ul pLocation: Barcelona, Spain. The role follows a hybrid model. Employees are required to work a minimum of six days per month in the office. /p pWallapop is an equal‑opportunity employer. We celebrate diversity and strive to create an inclusive environment for all employees. /p pWe sponsor visa processes for international candidates when applicable and provide legal and administrative support along the process combined with a competitive relocation package. /p h3Perks Benefits /h3 ul liGenerous individual learning budget of €2,000 per year. /li liFree office meals with lunch options from various providers. /li liGroup and individual English, Catalan and Spanish lessons. /li liPrivate health insurance through Alan. /li liFlexible working hours and intensive Fridays. /li liFlexible remuneration options (deductions for kindergarten, food or transport). /li liGym wellness plan, including on‑site physiotherapist. /li liGenerous referral programme and charitable donations. /li liBonus for weddings and newborns. /li liContribution towards monthly Wi‑Fi through payroll. /li liOne‑off payment to set up a home office. /li liRelocation package with monetary support, legal advice and visa sponsorship. /li li26 holidays per year. /li liTop‑grade hardware of choice (Apple or Windows). /li /ul /p #J-18808-Ljbffr

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