Senior Backend Engineer - Security SubsystemCountry: SpainOpen Digital Services is the software development company of Santander Group powering the next generation of banks by creating innovative banking products and implementing them in collaboration with Santander Group Affiliates. Santander Group is one of the world's largest financial institutions and the Eurozone's leader, we're committed to being the best Digital Bank with Branches in the industry. Our mission at ODS is to design and support an advanced digital and omnichannel platform, ensuring the best customer experience using cutting-edge technology. THE DIFFERENCE YOU MAKE Open Digital Services is looking for a Backend Software Engineer based out of Madrid following a hybrid setting or remote within Spain.Build shared security services used by multiple products and markets, focusing on reliable APIs, state and session management, authentication and authorization flows, security controls, and the operational foundations that keep these services available and understandable.Design, implement, test, deploy,



and operate backend services and APIs used in security-critical customer journeys.Turn requirements into maintainable designs and incremental delivery plans with senior engineers and Team Leads.Write clear, well-tested code and improve automated testing, documentation, and developer workflows.Contribute to data modelling, caching, asynchronous processing, resilience, and performance improvements.Professional Experience+4 years of professional experience building backend applications or services in Go or Java (Required)Good understanding of APIs, data structures, databases, testing, version control, and basic distributed systems concepts. (Required)Experience debugging software in production or production-like environments. (Preferred)LanguageEnglish (Required)Spanish (Preferred)Hard SkillsAPIs, data structures, databases, testing, and version control. (Required)Distributed systems concepts, caching, async

📌 Senior Backend Engineer (España)
🏢 Grupo Santander
📍 España