Technical Fraud Specialist

Adevinta; Barcelona; Híbrido; EUR 55.000 - 75.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Competitive compensation package

International environment

Training budget

Private health insurance

Flexible benefits (transport, meals, …

26 days holidays

Descripción de la vacante

Kleinanzeigen, part of Adevinta, seeks a technical fraud analyst in Barcelona to safeguard its high‑traffic marketplace. You will bridge data, product, and engineering to identify fraud patterns, respond to credential stuffing, and influence product roadmaps toward stronger defenses.

The role emphasizes analytical thinking, Python-based automation, and collaboration with stakeholders to reduce risk and improve user trust. Hybrid work is offered in Barcelona, Spain.

Formación

• 4+ years in fraud analytics, trust & safety, or similar technical role in a marketplace or e-commerce.
• Strong SQL proficiency and experience with data analysis tools (Tableau, Python).
• Familiarity with bot detection, credential stuffing, and other common C2C fraud patterns.

Responsabilidades

• Analyze fraud patterns using marketplace and behavioral data to uncover attack vectors and gaps.
• Monitor credential stuffing attacks, signaling from logins, IPs, and device fingerprinting.
• Design and implement technical fraud rules and tools with engineering to align prevention efforts.
• Contribute to strategic fraud prevention roadmap with automation opportunities.
• Support incident response and post-mortems for major fraud events and feed learnings into product and policy.
• Stay current on industry fraud trends and tools to stay ahead of attacks.

Conocimientos

SQL

Python

Tableau

Fraud detection

Communication

Herramientas

ThreatMetrix

Arkose

Sift

Rule engines

Descripción del empleo

Job Description

Kleinanzeigen reaches 36M+ monthly users and is Germany’s leading online classifieds market. We are a sustainability-focused platform where you won't just write code; you will power the services that bridge our high-traffic backend with seamless user experiences.

We are looking for a technical fraud analyst to join our growing fraud team. You’ll work at the intersection of data, product, engineering, and CS. Using your analytical and technical skills, you will identify fraudulent behaviour, monitor for credential stuffing attacks, bot attacks, build pro-active rule based defenses, and influence the roadmap to keep Kleinanzeigen safe marketplace.

This is a hybrid role, based in Barcelona Spain.

Job Requirements

• 4+ years of experience in fraud analytics, trust & safety, or a similar technical role in a C2C marketplace or traditional e-commerce environment.


• Strong proficiency in SQL and experience with data analysis tools (Tableau, Python, etc.).


• Familiarity with bot detection, account takeovers, credential stuffing, and other common C2C fraud patterns.


• Experience writing technical rules with rule engines (Threatmetrix, Arkose, Sift, internal-rule based system, etc.)


• Excellent cross-functional communication skills - you can translate technical findings for non-technical audience / stakeholders & vice versa.


• A curious, proactive mindset and a passion for solving complex problems that have real-word impact.


• Profecient with Python for more advanced data analysis & automation


• Experience to authentication, behavioural biometrics, and fraud stemming from user generated content such as ads and messages

Job Responsibilities

• Analyze fraud patterns using marketplace and behavioral data to uncover new attack vectors, emerging threats, and operational gaps.


• Monitor and respond to credential stuffing attacks, leveraging signals from login, IPs, device fingerprinting, and rate limiting systems.


• Design and implement technical fraud rules, filters, and tools in collaboration with engineering to align fraud prevention efforts and resolve complex incidents.


• Contribute to the strategic fraud prevention roadmap by identifying opportunities for improvements and automation.


• Support incident response and post-mortems for major fraud events, ensuring learnings feed into product and policy improvements.


• Stay current on industry fraud trends, and tools, bringing external insights to help us stay ahead of attacks.

Job Benefits

• Competitive compensation package


• A unique position in an international and dynamic environment


• Opportunity to shape the way we work. Your feedback and opinions are valued at all levels of the organization


• The chance to be a key player in a growing, highly skilled team


• Great colleagues and a healthy working environment


• Benefits like private health insurance.


• Career development, including individual training budget.


• Flexible benefits program (transport, restaurants, child-care, etc)


• 26 days of holidays