Threat & Fraud Intelligence Specialist

Kleinanzeigen is the leading online classifieds market in Germany. An average of more than 50 million ads are available in numerous categories - from children's supplies to electronics to real estate. With more than 36 million users per month, Kleinanzeigen has the widest reach of all online selling platforms in the country. Most of the items traded on Kleinanzeigen are second-hand. In this way, users make an active contribution to sustainability. The Kleinanzeigen market allows companies the opportunity to easily offer their services online. Kleinanzeigen was launched in September 2009 as eBay Kleinanzeigen. Since June 2021, the company has been part of Adevinta, a leading global provider of online classified ads. In May 2023, the name was changed to Kleinanzeigen.

Kleinanzeigen is part of Adevinta: a global online classifieds specialist and sustainability leader with 25+ products in 10 countries.

We are looking for a Threat & Fraud Intelligence Specialist 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. 

What you’ll do: 

• 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. 

Who you are:

• 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. 

• Experience with Python for more advanced data analysis & automation

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

Life at Adevinta comes with its perks! Our Adevintans enjoy the following benefits:

• An attractive Base Salary 💸

• Participation in our Short Term Incentive plan (annual bonus) 🏆

• Work From Anywhere: Enjoy up to 20 days a year of working from anywhere! Maybe not from the moon🌛well why not! just make sure you have internet connection! 🌍

• A 24/7 Employee Assistance Program for you and your family, because we care ❤️

• Win together, lose together is one of our key behaviours. At Adevinta you will find a collaborative environment with an opportunity to explore your potential and grow 🌱

On top of these, we also provide a range of locally relevant benefits. Wanna know more? Apply and ask our recruiters! ✨

Adevinta is an equal opportunity employer and we value diversity. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status or disability status.

If you feel like you don’t meet all of the requirements for this role but are interested, please consider applying anyway. Research suggests that women and individuals from underrepresented groups may self-select out of opportunities if they don’t meet 100% of the job requirements. We strongly encourage people from historically excluded groups to apply and look forward to speaking with you.