Job Summary: We are looking for a Senior Backend Developer with experience in the architecture of complex banking projects, focused on data model definition, and design and implementation of rule engine and signing mechanism integration services. Key Highlights: 1. Senior Backend development in complex banking or corporate environments 2. Definition and evolution of robust and scalable data models 3. Design and implementation of backend services (rule engines, signing) Company Description Why work at Sopra Steria? Because it also means feeling **Sopra Steria**. We are a recognized European leader in consulting, digital services, and software development, with nearly 56,000 employees across nearly 30 countries and over 4,000 in Spain. We focus on people—on their training and professional development—which drives our constant growth and improvement. We are passionate about digital, and just like you, we seek the best adventure. We want your everyday experience to become your greatest source of inspiration—to learn, contribute, have fun, grow, and above all, enjoy it to the fullest. If you want to join a “**Great Place to Work**” team, keep reading! Job Description What challenge do we propose? We are seeking a Senior Backend Developer with experience in architecture projects within complex banking or corporate environments, primarily oriented toward data model definition and the design and implementation of rule engine services and client-side signing mechanism integration. Main Responsibilities: * Define and evolve a robust and scalable data model for: * signing methods and mechanisms * trust devices * signing and authorization rules * state management and traceability * Design, implement, or lead the implementation of backend services, especially: * rule engines * client signing mechanism integration and management services * validations and decision management * Be responsible for the technical execution of changes defined by the project team, coordinating and supporting the implementation team. * Ensure proper alignment with Bankinter’s corporate architecture, in coordination with the internal architecture team. * Prepare and maintain project technical documentation (architecture, data model, services, workflows, and technical decisions). Requirements What are we looking for? Required Experience: * Experience in backend architecture or advanced technical development in banking or organizations with high technical demands. * Proven experience in: * defining complex data models * designing and implementing backend services and microservices * technical execution of changes in cross-functional projects Additional Information What do we offer you? * Indefinite contract and full-time schedule * 23 vacation days * Continuous training: technical, transversal, and language skills. We provide access to certifications, training from leading technology partners, online platforms, and much more! * Life and accident insurance * Option to enroll in our flexible compensation plan (health insurance, childcare vouchers, transportation, meal vouchers, and training) * Access to the Privilege Club, offering attractive discounts with major brands * Personalized and detailed onboarding. We support you every step of the way so you feel \#soprano from day one. * Office with dedicated leisure spaces—work and fun combined! * Camaraderie and a positive atmosphere—we truly value the power of unity. And most importantly…you have the opportunity to develop your professional career with us: Together, we will create a personalized career plan. You’ll receive training, we’ll set goals, and conduct follow-ups to ensure we achieve them together. We listen to your priorities and fight for them. Here, your voice matters! Join us and be part of something bigger! **The world is how we shape it** We commit to respecting diversity, creating an inclusive workplace, and implementing policies that foster inclusion and promote social and cultural respect regarding gender, age, ability, sexual orientation, and religion—with equal opportunities.