Senior Data Engineer

Team description

The Card Not Present (CNP) Protect team is a cross-functional group within SumUp's Risk & Compliance tribe, responsible for keeping millions of merchants safe by preventing fraud across our card-not-present products. We build production-grade ML systems and data pipelines that power real-time automated decisioning — and we're now expanding our infrastructure to support foundation model embeddings. This is a high-ownership, high-impact role at the core of SumUp's financial safety mission, where the quality of your data work directly shapes how well our fraud detection performs.

What you'll do

• Design, build, and maintain production-grade Python-based data pipelines that power ML workflows, including real-time and near-real-time data processing
• Take full ownership of data quality and reliability — implementing validations, automated testing, monitoring, and alerting with clearly defined SLAs
• Strengthen our data foundations by documenting architecture, data lineage, dataset definitions, and dependency management
• Lead Feature Store governance, improve usability, and standardise our feature store setup so data scientists can move faster and with confidence
• Work closely with the Risk Platform, ML Data Platform, data scientists, software engineers, and analysts to deliver changes safely to production

You'll be great for this role if

• Strong proficiency in Python and PySpark, with hands-on experience designing computationally efficient solutions in large-scale production environments
• Experience building and maintaining feature engineering pipelines, including enriched attributes for online and offline use cases
• Comfort working with cloud infrastructure such as AWS (S3, EKS, Keyspaces, Athena) or equivalent providers, alongside containerisation tools like Docker and version control with Git
• Experience with streaming or event-driven architectures (such as Kafka) and familiarity with open table formats like Apache Iceberg or Delta Lake
• A track record of taking data quality and governance seriously, with an ability to communicate technical concepts clearly to non-technical collaborators

Nice to have:

• Experience working in Fintech or Risk & Compliance domains
• Experience with embeddings or representation learning pipelines

We'd love to hear from you even if you don't tick every box. What matters most to us is how you think, collaborate, and grow.

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 onto our Virtual Stock Option programme: you will own a stake in SumUp's future success
• A dedicated annual L&D budget of €2000 for attending conferences and/or advancing 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 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.