Payment Fraud Specialist

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.

Backed by top investors such as Accel, Insight Partners & Naver Corp we bring our total valuation to 806 million EUR and are embarking on our international journey with the aim to become the world's best unique goods trading platform.

The Challenge 

 We are looking for a Payment Fraud Specialist to join our Trust & Safety team, reporting directly to the Trust & Safety Manager.

In this role, you will protect Wallapop's platform by detecting, preventing, and mitigating fraudulent activity—ensuring a safe and trustworthy experience for all users. You'll go beyond investigation by designing proactive, data-driven fraud prevention strategies in collaboration with Product, Operations, Engineering, and other cross-functional teams.

What You Will Do 

• Prevent and mitigate fraud – Monitor emerging fraud trends, identify abuse patterns, and design proactive measures to reduce risk while maintaining a seamless user experience.
  
  
• Collaborate cross-functionally – Work closely with Product, Engineering, and Operations teams to enhance fraud detection tools, improve automation, and ensure new features are fraud-resilient.
  
  
• Leverage data for insights – Analyze fraud patterns and key metrics, identify trends, and propose data-backed improvements to detection models and workflows.
  
  
• Investigate and manage risk – Conduct in-depth investigations into high-risk cases, identify vulnerabilities, and recommend long-term process or product improvements.
  
  
• Share knowledge and mentor – Support teammates by sharing best practices, training materials, and fostering a strong fraud prevention culture within Trust & Safety.
  
  
• Contribute to Trust & Safety initiatives – Support broader platform integrity efforts, adapt to evolving risks, and contribute to security, compliance, and moderation improvements.
  
  

Key Deliverables:
Fraud trend reports, optimized workflows, enhanced detection features, fraud metrics dashboards, and evidence of team knowledge-sharing and capability building.

What We're Looking For 

• Fraud prevention and risk management experience – Proven experience identifying and mitigating payment or platform fraud, ideally in marketplaces, fintech, or e-commerce.
  
  
• Analytical and data-driven mindset – Strong proficiency with Excel (or BI tools) to identify trends, assess risks, and inform decision-making.
  
  
• Experience with fraud detection tools and workflows – Familiar with automated detection systems, case management tools, and investigation processes.
  
  
• Strong collaboration skills – Able to build effective relationships across Product, Engineering, and Operations.
  
  
• Strategic thinker – Able to connect fraud insights to broader business goals and user experience.
  
  
• Decisive and organized – Skilled in prioritizing tasks, making sound judgments, and managing complex, high-impact issues.
  
  
• Proactive and adaptable – Comfortable in fast-changing environments, anticipating and responding quickly to emerging threats.
  
  
• Fluent in English – Spanish is a plus.

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.

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:

• Competitive phantom shares package for all employees
• Generous individual learning budget of 2k per year
• 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 plan for free shipping, bumps & home-pick-up on our services
• 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 / Case Study Submission / Take-home test - you will be assigned a task to submit within 5 days where you will be able to showcase your expertise / 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.