Senior / Lead Developer - Core Data Services (SAP BTP) (m/f/d)

Innovation is and will always be the core of SAP Fioneer, and it is the promise of why we were spun out of SAP: agility, innovation, and delivery. SAP Fioneer builds on a heritage of outstanding technology and a deep understanding of corporate and consumer demands. At the heart of it all it is simple: We bring financial services to the next level with innovative software solutions and platforms. We are helping companies in the financial services industry to achieve speed, scalability, and cost-efficiency through digital business innovation, cloud technology, and solutions that cover banking and insurance processes end-to-end. A global company, with rapid growth, innovative people, and a lean organization makes SAP Fioneer a place where you accelerate your future! About the Role Join us in shaping the next generation of digital customer experiences in the financial services industry. As a Senior / Lead Developer for Core Data Services , you will drive technical architecture decisions, lead implementation activities on SAP Business Technology Platform (SAP BTP), and help deliver scalable, secure, and future-ready solutions in a highly collaborative environment. In this role, you will take end-to-end technical ownership for Core Data Services development within a large-scale customer portal transformation program. You will combine hands-on development with technical leadership, guiding architecture decisions, mentoring developers, and ensuring the successful delivery of SAP BTP-based solutions through to go-live. Key responsibilities • Lead the design and development of Core Data Services for customer-facing portal applications on SAP BTP and SAP RISE, following Clean Core principles. • Define and maintain technical and architecture concepts, support quality gates, and ensure alignment with project and enterprise architecture standards. • Design and implement modular services using the ABAP RESTful Application Programming Model (RAP) and Cloud Application Programming Model (CAP), including integrations through the SAP BTP Integration Suite. • Establish secure authentication and authorization concepts, including XSUAA, role management, and access control frameworks. • Provide technical leadership to the development team through code reviews, mentoring, release governance, documentation, and deployment readiness activities. Requirements • Several years of hands-on software development experience on SAP BTP, ideally within Clean Core transformation projects. • Proven expertise with RAP and/or CAP and the development of enterprise-grade cloud applications. • Strong knowledge of authentication, authorization, and security concepts on SAP BTP, including XSUAA and role-based access management. • Practical experience with Artificial Intelligence (AI) solutions, Agentic AI concepts, and Human-in-the-Loop implementation approaches. • Demonstrated ability to take ownership of architecture and solution design, while leading delivery within agile development teams. Nice to have • Deep expertise in AI-enabled solutions and services on SAP BTP. • Experience with SAP RISE, SAP BTP Integration Suite, and API management capabilities. • Previous experience leading small development teams within banking, public funding, or regulated financial environments. • German language skills. Benefits You will have the opportunity to collaborate with some of the brightest minds in the industry on an incredibly ambitious project to shape the ever-evolving financial sector. This is an environment where you can have it all — the agility, enthusiasm, and dynamism of a start-up, combined with the established expertise, solid market presence, and extensive customer network of a more established organization. At SAP Fioneer, you will benefit from a fle