{"id":3150843,"url":"https://alion.io/job/kleinanzeigen-com-technical-fraud-specialist","title":"Technical Fraud Specialist","company":{"id":2949074,"name":"Kleinanzeigen","domain":"kleinanzeigen.com","url":"https://alion.io/company/kleinanzeigen-com","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":true,"listed_via":null,"ats_vendor":"HiBob","truth_index":null},"role":"Finance","role_family":"Finance","seniority":"middle","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Spain"],"countries":["ES"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":24000,"max_usd":71000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":3248},"experience_years_min":4,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Python","optional":false},{"name":"SQL","optional":false},{"name":"Tableau","optional":false}],"status":"live","first_seen_at":"2026-10-23T09:41:55Z","employer_posted_date":"2026-10-23","last_verified_at":"2026-10-27T03:35:18Z","board_verified":true,"closed_at":null,"days_open":3,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":3},"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.\nThis is a hybrid role, based in Barcelona Spain. \nResponsibilities\nWhat you’ll do:Analyze fraud patterns using marketplace and behavioral data to uncover new attack vectors, emerging threats, and operational gaps.\nMonitor and respond to credential stuffing attacks, leveraging signals from login, IPs, device fingerprinting, and rate limiting systems.\nDesign and implement technical fraud rules, filters, and tools in collaboration with engineering to align fraud prevention efforts and resolve complex incidents.\nContribute to the strategic fraud prevention roadmap by identifying opportunities for improvements and automation. \nSupport incident response and post-mortems for major fraud events, ensuring learnings feed into product and policy improvements. \nStay current on industry fraud trends, and tools, bringing external insights to help us stay ahead of attacks.\nRequirements\nWho 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.\nStrong proficiency in SQL and experience with data analysis tools (Tableau, Python, etc.).\nFamiliarity with bot detection, account takeovers, credential stuffing, and other common C2C fraud patterns.\nExperience writing technical rules with rule engines (Threatmetrix, Arkose, Sift, internal-rule based system, etc.)\nExcellent cross-functional communication skills - you can translate technical findings for non-technical audience / stakeholders & vice versa. \nA curious, proactive mindset and a passion for solving complex problems that have real-word impact. \nProfecient with Python for more advanced data analysis & automation\nExperience to authentication, behavioural biometrics, and fraud stemming from user generated content such as ads and messages\nBenefits\nAt Kleinanzeigen, we care about our people - their wellbeing, growth, and life beyond work. Our benefits are designed to support you holistically, giving you flexibility and opportunities to thrive.Flexibility\n26 business days of paid annual holidays\n20 days “work from anywhere”\nFlexible working time (hybrid)\nPaid additional parental leave for both parents\nExtra paid days off for special occasions (e.g. your wedding or a move)\n Wellbeing & SupportPrivate health insurance\nGym Pass (may cover up to 70% of gym membership fees) \n40€ per month as a remote working allowance. \n Growth & DevelopmentPersonal development budget\nLearning opportunities to grow your skills and career\nA unique position in an international and dynamic environment\nA flat, collaborative culture where your feedback actively shapes our processes\n Perks & Everyday BenefitsCompetitive compensation package (Base salary + annual bonus)\nFlexible Remuneration Program (tax-efficient options for transport, restaurant vouchers and childcare)\nCorporate benefits and exclusive discounts\nAn attractive referral program\nKleinanzeigen is an equal opportunity employer that values diversity and inclusion. We welcome people of all backgrounds, races, religions, colours, national origins, gender identities, sexual orientation, ages, marital status, or disability status.\nIf this role sparks your interest but you’re not sure you meet every single requirement, we’d still love to hear from you anyway!","description_format":"text","description_chars":3926,"description_truncated":false,"requirements":{"experience_years_min":4,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Flexible schedule","Gym membership","Health insurance","Parental leave"],"hiring_locations":[{"name":"Spain","iso":"ES","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Internet Services","Marketplaces","Online Classifieds"],"lifecycle":[{"event":"open","at":"2026-10-23T12:16:35Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":2,"expected_fill_days":48,"reasons":["conf:2","velocity","win:early"],"computed_at":"2026-10-26T05:57:25Z"},"pay":null,"html_url":"https://alion.io/job/kleinanzeigen-com-technical-fraud-specialist","json_url":"https://alion.io/job/kleinanzeigen-com-technical-fraud-specialist.json","meta":{"generated_at":"2026-10-27T04:11:19Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":3667,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-28T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":2949074},"rest":"https://alion.io/mcp/rest/get_company?id=2949074"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fkleinanzeigen-com-technical-fraud-specialist"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fkleinanzeigen-com-technical-fraud-specialist"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fkleinanzeigen-com-technical-fraud-specialist"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/kleinanzeigen-com-technical-fraud-specialist\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fkleinanzeigen-com-technical-fraud-specialist"}]}