Staff Data Scientist - Experimentation
2 days ago
Barcelona
ppWallapop is a Barcelona based scale-up driven by the purpose to empower people to embrace a more conscious and human way of consumption. We believe in a world where collaborative economy is mainstream. This is what drives us. /p pWallapop operates in Spain, Italy and Portugal, offering a catalogue of several hundreds of millions of products and services. Powered by technical innovation and continuous improvement, we bring together the scale trust of classifieds with the marketplace’s convenience reach. Our mission is to enable a connected trade ecosystem, making 2nd‑hand the norm through smart use of technology. /p h3The Challenge /h3 pWe are seeking an experienced Experimentation lead who will own the evolution of Wallapop's experimentation practice. This person will define the company's 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 pYou will partner closely with Product, Engineering, Data Science, Analytics, and Executive leadership to ensure experiments are designed, executed, analyzed, and interpreted consistently across the organization. You will be both a hands‑on expert and an internal consultant, helping teams answer critical questions about marketplace growth, personalization, search, discovery, trust safety, monetization, and seller experiences. /p h3What You Will Do /h3 ul libExperimentation Strategy: /b Define Wallapop's experimentation vision and roadmap, establish company‑wide standards, create frameworks for experiment prioritization, 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 incremental measurement) to reduce decision latency. /li libProduct Partnership Enablement: /b Act as a strategic advisor and coach to Data Analysts, Data Scientists, and PMs on hypothesis development, experiment design, and success metrics to raise overall experimentation maturity. /li libEducation: /b Build Wallapop's experimentation curriculum, deliver training programs 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 ads monetization. /li /ul h3What We’re Looking For /h3 ul libTechnical Expertise: /b 8+ years of total experience in data science, product analytics, or causal inference, including at least 4 years deeply focused on experimentation (experimental design, statistical inference, A/B testing, and variance reduction). /li libTooling Code: /b Strong SQL proficiency along with experience using Python or R. /li libProduct Partnership: /b Proven ability to partner directly with Product organizations and influence senior stakeholders using strong business judgment. /li libLeadership: /b Demonstrated success building experimentation cultures, experience coaching PMs and analysts, and excellent communication skills. /li /ul h3What Would Be A Plus /h3 ul liExperience in Amplitude /li liExperience working in marketplaces, e‑commerce, consumer internet, or two‑sided platforms. /li liExperience with recommendation systems or search systems. /li /ul pDo note that all our jobs are based in Barcelona. We follow a hybrid model where flexibility rules. We commit to a minimum of 6 days per month in the office. Each team self‑organizes to decide on cadence and in‑person/remote rituals. /p pWallapop is an equal‑opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees as we want Wallapop to be a place for everyone. /p pWe sponsor visa processes for international candidates when applicable and provide legal admin support along the process combined with a competitive relocation package. /p h3Perks Benefits /h3 ul liGenerous individual learning budget of 2K per year /li liFree office meals, lunch selection from different providers /li liGroup and individual English, Catalan Spanish lessons as part of our working day /li liPrivate Health Insurance with Alan /li liFlexible working hours + intensive Fridays /li liFlexible remuneration to deduct from gross salary (kindergarten/food/transport check) /li liGym Wellness plan, including physiotherapist in the office /li liGenerous referral Program Charity Donation /li liBonus for weddings newborns /li liMonthly product advantages (Wallapop Club) /li liWork anniversary Gifts and Birthday Surprises /li liContribution towards your WIFI in your monthly payroll /li liOne‑off payment based on compensation package to go towards setting up your home office /li liRelocation package (monetary support and legal advice) and visa sponsorship, if applicable /li li26 holidays per year /li liTop hardware of your choice (latest Apple or Windows) /li /ul h3Hiring Process /h3 ul libIntro Call /b – run by talent acquisition, focus on providing more information about the role and the company as well as going over your experience, motivation, and expectations. This usually takes 45‑60 minutes. /li libTask /b – you will be assigned a task to submit within 5 up to 7 days where you will be able to showcase your expertise and technical skills required for the role. /li libExpertise Interview /b – run by the hiring team, focus on the required core skills and the ability to deliver in a given context. This usually takes 60‑90 minutes. /li libStakeholder Interview /b – run by relevant stakeholders reflecting the reality of the context of the role, focus on the ability to collaborate deliver in a cross‑functional set‑up. This usually takes 60 minutes. /li libCulture Interview /b – run by culture interviewers, focus on adherence to Wallapop's purpose and business proposition. This usually takes 60 minutes. /li libOffer /b – should you be the right candidate, your offer will be discussed over a call with talent acquisition and will then be confirmed in writing. /li /ul pWallapop is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender identity, sexual orientation, national origin, disability, or veteran status. /p /p #J-18808-Ljbffr