Job Description

Berlin, Germany | Full-time | Office-first

Team description

CNP Protect is a cross-functional squad within SumUp's Risk & Compliance tribe, responsible for the ML models, rule checkpoints, and automated decisioning systems that prevent card-not-present fraud at scale. We're currently executing two of the most technically demanding data engineering workstreams in the tribe: migrating from a third-party rules engine (NOTO) to a fully in-house system, and productionising a foundational merchant embedding model built on representation learning. This Senior Data Engineer will own the data layer that makes both possible — the feature pipelines, the embedding infrastructure, and the quality standards that underpin every automated decision we make.

What you'll do

• Build and operate Python and PySpark-based feature pipelines that serve enriched transaction and merchant attributes to our in-house rule engine and ML models, covering both batch and near-real-time processing
• Implement and standardise our Feature Store setup — defining schemas, ownership, freshness SLAs, and lineage documentation so attributes are consistent and auditable across rule engine and ML use cases
• Design and run batch pipelines to generate, version, and publish merchant embeddings using open table formats such as Apache Iceberg or Delta Lake, in collaboration with Data Science and ML Platform
• Put robust data quality in place across all pipelines: automated validation, monitoring, alerting, and end-to-end debugging from source through transformation to serving
• Collaborate with Risk Platform and Data Platform teams to adopt shared tooling and standards across orchestration, observability, and governance — and help the squad move toward near-real-time embedding serving

You'll be great for this role if…

• Advanced proficiency in Python and performance-tuned PySpark, with strong software engineering skills, including CI/CD for data applications in large-scale production environments
• Experience building and maintaining feature store pipelines, with hands-on knowledge of enriched attribute design for both online and offline serving
• Solid knowledge of AWS services, including S3, EKS, Keyspaces, and Athena, alongside open table formats such as Apache Iceberg or Delta Lake
• Familiarity with streaming and event-driven architectures — ideally Kafka — and a good grasp of API design, Docker, and Git-based version control workflows
• Experience with embeddings or representation learning pipelines is a strong plus, as is a background in fraud, risk, or other decisioning-heavy domains

Why you should join SumUp

• 🌎 Opportunity to work with SumUppers 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 in our Virtual Stock Option programme: you will own a stake in SumUp'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, and subsidised office lunches
• 🌴 Break4me: 1-month sabbatical after 3 years of service
• 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team

About SumUp

Be empowered to do more that matters.

At SumUp, 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 37 markets rely on SumUp as their financial partner to manage payments, finance, and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify.

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Discover more about our culture and opportunities on our careers website, and follow our journey on LinkedIn, Instagram, and TikTok

Job Application Tip

We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.