Fraud Prevention Specialist

Fraud Prevention team
· Berlin, Germany (office-first)

Sum Up's Fraud Prevention team sits at the intersection of risk, data and global payments, working at pace to stay ahead of one of fintech's most dynamic challenges: stopping fraud at scale across multiple markets and products. In this role, you'll help protect Sum Up's acquiring business globally, using data, analytical thinking and fraud prevention expertise to reduce losses while safeguarding approval rates and the experience of our merchants and their customers.

You'll work on complex, high impact fraud challenges across international markets, building a deep understanding of fraud performance and turning your analysis into practical strategies that shape how we prevent fraud over time.

• Shape fraud prevention strategy for Sum Up's acquiring business across international markets
• Analyse large, complex datasets to spot fraud trends, performance shifts and opportunities for improvement
• Design, configure and test decision engine rules, thresholds and authentication strategies
• Monitor fraud, chargeback, approval rate and false positive performance to assess strategy effectiveness
• Investigate root causes of performance changes and recommend clear, evidence based actions
• Translate regulatory and card scheme requirements into practical fraud controls

• Proven experience in fraud prevention, fraud strategy or risk management within payments, fintech or another data driven environment
• Advanced skills in SQL and Python, including experience working with data pipelines and large datasets
• Hands on experience configuring fraud decision engines, rule based systems or authentication strategies
• Strong knowledge of Card Present and Card Not Present fraud patterns across diverse markets, with the ability to apply this knowledge to strategy
• Ability to balance merchant conversion, approval rates, fraud losses and false positives when making decisions, and to communicate recommendations clearly to technical and senior stakeholders

• Participation in industry working groups, webinars or communities focused on global fraud trends
• Knowledge of acquirer settlement flows and interchange economics
• Experience working with card scheme requirements or regulatory change across international payments markets

Opportunity to work with Sum Uppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup

Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced

Enrolment onto our Virtual Stock Option programme: you will own a stake in Sum Up's future success

A dedicated annual L&D budget of €2000 for your individual development, which can be used to attend conferences and/or advance your career through further education

A corporate pension scheme where we match up to 20% of your contributions

Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days

Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches

Break4me: 1-month sabbatical after 3 years of service

Referral Bonus: earn additional rewards by referring talented individuals to join the Sum Up team

Be empowered to do more that matters.

At Sum Up, we’re on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 39 markets rely on Sum Up as their financial partner to manage payments,…