---
title: 'Staff Data Scientist, Experimentation at Wallapop'
canonical: 'https://feeny.ai/job/staff-data-scientist-experimentation-wallapop-barcelona-035nvs0fh2xq'
type: 'job'
last_seen: '2026-09-08'
---

# Staff Data Scientist, Experimentation at Wallapop

- **Company:** Wallapop
- **Location:** Barcelona, Spain
- **Posted:** 2026-07-03
- **Last confirmed live:** 2026-09-08
- **Apply:** https://job-boards.eu.greenhouse.io/wallapop/jobs/4917916101

## Job description

Wallapop 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💫.

Wallapop 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.

The Challenge 🧩

We 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.

You 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.

## What You Will Do👇

- Experimentation Strategy: Define Wallapop's experimentation vision and roadmap, establish company-wide standards, create frameworks for experiment prioritization, 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 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.
- Education: Build Wallapop's experimentation curriculum, deliver training programs 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: Design experimentation approaches for search ranking, recommendations, personalization, marketplace liquidity, supply-demand dynamics, seller growth, trust & safety, and ads monetization.

## What We’re Looking For 🔍

- Technical Expertise: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).
- Tooling & Code: Strong SQL proficiency along with experience using Python or R.
- Product Partnership: Proven ability to partner directly with Product organizations and influence senior stakeholders using strong business judgment.
- Leadership: Demonstrated success building experimentation cultures, experience coaching PMs and analysts, and excellent communication skills.

What Would Be A Plus 🚀

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

Do note that all our jobs are 📍 Barcelona based. 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.

Wallapop 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.

We sponsor visa processes for international candidates when applicable and provide legal & admin support along the process combined with a competitive relocation package.

Additionally to the opportunity to contribute to an agile product set up and work together towards achieving our meaningful mission, we offer the following 🍭 Perks & Benefits:

- Generous individual learning budget of 2K per year
- Free office meals, lunch selection from different providers
- Group and individual English, Catalan & Spanish lessons as part of our working day
- Private Health Insurance with Alan
- Flexible working hours + intensive Fridays
- Flexible remuneration to deduct from gross salary (kindergarten/food/transport check)
- Gym & Wellness plan, including physiotherapist in the office
- Generous referral Program & Charity Donation
- Bonus for weddings & newborns
- Wallapop Renta (Tax income support)

-

Monthly product advantages (Wallapop Club)

- Work anniversary Gifts and Birthday Surprises

- Contribution towards your WIFI in your monthly payroll
- One-off payment based on compensation package to go towards setting up your home office
- Relocation package (monetary support and legal advice) and visa sponsorship, if applicable
- 26 holidays per year
- TOP hardware of your choice (latest Apple or Windows)

What does the hiring process for this position look like? 👀 **Please, note that all interviews take place remotely over hangouts.**

Intro Call - 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.

Task - 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.

Expertise Interview - 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.

Stakeholder Interview - 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.

Culture Interview - run by culture interviewers, focus on adherence to Wallapop's purpose and business proposition. This usually takes 60 minutes.

Offer - should you be the right candidate, your offer will be discussed over a call with talent acquisition and will then be confirmed in writing.

## About Wallapop

## Company Overview
- **One-liner**: Wallapop is a mobile-based C2C secondhand marketplace platform that connects millions of users to buy and sell pre-owned goods, promoting a sustainable consumption model.
- **Entity Type**: Private (Acquired by Naver Corporation in August 2025)
- **Headquarters**: Barcelona, Spain
- **Founded**: 2013
- **Founders**: Gerard Olivé, Agustín Gómez, Miguel Vicente, Lluís Saleta

## Core Business
- **Primary industry/industries**: Technology, Information and Internet; C2C Marketplace; Secondhand Goods
- **Target customers**: B2C (individual consumers) and B2B (professional sellers); primarily focused on Spain, Italy, and Portugal
- **Mission or purpose statement**: To create a unique inventory ecosystem of reused products that facilitates a more humane and sustainable consumption model, promoting a more dynamic and efficient economy while loving diversity.

## Products & Services
- **Wallapop Marketplace**: A mobile-first platform for buying and selling secondhand goods across all categories, from household items to electronics. It uses location-based matching, real-time chat, user rating systems, and AI-based recommendation algorithms.
- **Wallapop Envíos**: An integrated shipping service that offers users delivery solutions for items purchased on the platform.
- **Pro Seller Subscriptions**: A subscription-based service for professional sellers, offering enhanced features and tools for high-volume merchants.
- **Wallapop Motors**: A dedicated vertical for used cars, which has become a market-leading segment for the company.

## Market Standing
- **Valuation/Market Cap**: The acquisition by Naver was valued at EUR 377 million (approx. KRW 604.5 billion) for an additional 70.5% stake, implying a total enterprise value of ~EUR 535 million. Prior to acquisition, total funding was $448.1M.
- **Key Metric**: Annual Revenue of $76.9 million; Total Funding of $448.1 million; 19 million monthly active users; over 100 million listings annually.
- **Notable Investors/Partners**: Naver Corporation (parent company), Korelya Capital, Mangrove Capital, Northzone, Eight Roads Ventures, Next Tech Fund.
- **Growth Signals**: Acquired by Naver in August 2025, signaling a major strategic shift. Expanded into Italy (2021) and Portugal (2022). Headcount grew +4.7% YoY to 315 employees. The used car vertical (Motors) is a market leader in Spain.

## Competitive Advantages
- **Dominant Market Position**: Spain’s largest C2C platform with a household name and a strong user base of 19 million MAUs.
- **Tech-Forward UX**: AI-powered recommendations, location-based matching, and a strong mobile-first experience differentiate it from traditional classifieds.
- **Naver Technology Backing**: Post-acquisition, Wallapop will integrate Naver’s advanced search, advertising, payments, and AI technologies, creating a significant competitive moat.
- **Circular Economy Trend**: Capitalizes on the growing global interest in sustainability and the circular economy, which drives user acquisition and retention.

## Strategic Focus
- **Integration with Naver**: The primary focus is integrating Naver’s technology stack (AI, search, payments, advertising) to enhance the platform and create new user experiences.
- **European Expansion**: Continue to grow its footprint in Southern Europe (Spain, Italy, Portugal) and potentially beyond, leveraging Naver’s global C2C network (which includes Poshmark, KREAM, SODA).
- **Vertical Specialization**: Deepening its presence in verticals like used cars (Motors) and refurbished electronics.
- **Monetization Diversification**: Growing revenue from transaction fees, shipping, advertising, and pro seller subscriptions.

## Why Work Here
- **Culture & Mission**: Strong focus on sustainable consumption, diversity, and community. The company describes itself as “conscious and humane.”
- **Work Environment**: A stunning, sustainable office in Barcelona with a sunny terrace, free lunches, coffee, and fruit. Team events and offsite trips are common.
- **Compensation & Benefits**: Competitive salaries (e.g., iOS Engineer ~€51,668/yr, QA Lead ~€65,000/yr). Benefits include:
    - EUR 2,000 annual learning budget
    - Custom hardware setup (latest Apple or Windows)
    - In-house language lessons (English, Spanish, Catalan)
    - Flexible schedule & “intensive Fridays”
    - 26 days of annual leave
    - Private health insurance
    - Urban Sports Club fitness subscription
    - WIFI & home office allowance
    - Tax Support
- **Engineering Culture**: Data-driven with a focus on AI/ML (MLOps, Data Science, Search). Strong emphasis on personal growth with a dedicated learning budget.
- **Diversity & Inclusion**: Explicitly states they are an equal-opportunity employer committed to building a diverse and inclusive team.
- **Employer Rating**: 3.8/5.0 on Glassdoor (122 reviews), with Work-Life and Culture both scoring 3.8.

## Sources
1. [about.wallapop.com](https://about.wallapop.com/en/)
2. [job-boards.eu.greenhouse.io](https://job-boards.eu.greenhouse.io/wallapop)
3. [linkedin.com](https://es.linkedin.com/company/wallapop)
4. [navercorp.com](https://www.navercorp.com/media/pressReleasesDetail?seq=33164)
5. [job-boards.eu.greenhouse.io (Jobs)](https://job-boards.eu.greenhouse.io/wallapop/jobs/4701711101)

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