Staff Data Scientist, Experimentation

Responsibilities

• ▹Define Wallapop's experimentation vision and roadmap, establish company-wide standards, create frameworks for experiment prioritization, and develop guardrail metrics and governance
• ▹Own statistical 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
• ▹Act as a strategic advisor and coach to Data Analysts, Data Scientists, and PMs on hypothesis development, experiment design, and success metrics
• ▹Build Wallapop's experimentation curriculum, deliver training programs for PMs, Designers, Engineers, and Analysts, and establish playbooks and office hours
• ▹Partner with Data Engineering and Analytics Engineering to improve infrastructure, evolve Amplitude Experiment data practices, and define quality standards for exposure logging
• ▹Design experimentation approaches for search ranking, recommendations, personalization, marketplace liquidity, supply-demand dynamics, seller growth, trust & safety, and ads monetization

Requirements

• ▹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)
• ▹Strong SQL proficiency along with experience using Python or R
• ▹Proven ability to partner directly with Product organizations and influence senior stakeholders using strong business judgment
• ▹Demonstrated success building experimentation cultures, experience coaching PMs and analysts, and excellent communication skills

Nice to have

• ▹Experience with Amplitude
• ▹Experience working in marketplaces, e-commerce, consumer internet, or two-sided platforms
• ▹Experience with recommendation systems or search systems

Soft skills

About the company

Wallapop is a Barcelona-based scale-up driven by the purpose to empower people to embrace a more conscious and human way of consumption. It operates in Spain, Italy and Portugal, offering a catalogue of several hundred million products and services. Its mission is to enable a connected trade ecosystem, making 2nd-hand the norm through smart use of technology.