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.
You’ll work at the intersection of data, product, engineering, and CS. This is a hybrid role, based in Barcelona Spain.
Strong proficiency in SQL and experience with data analysis tools (Tableau, Python, etc.).
~ Experience writing technical rules with rule engines (Threatmetrix, Arkose, Sift, internal-rule based system, etc.)
~ 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





Analyze fraud patterns using marketplace and behavioral data to uncover new attack vectors, emerging threats, and operational gaps.
26 business days of paid annual holidays
~Versátil working time (hybrid)
~ Extra paid days off for special occasions (e.g. your wedding or a move)

Private health insurance
~ 40€ per month as a remote working allowance.

Personal development budget
Flexible Remuneration Program (tax‑efficient options for transport, restaurant vouchers and childcare)
If this role sparks your interest but you’re not sure you meet every single requirement, we’d still love to hear from you anyway
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📌 SQL Technical Specialist (Madrid)
🏢 Kleinanzeigen
📍 Madrid