Java Developer with Identity & Security Focus (REF5700T)

As Hungary’s most attractive employer in 2025 (according to Randstad’s representative survey), Deutsche Telekom IT Solutions is a subsidiary of the Deutsche Telekom Group. The company provides a wide portfolio of IT and telecommunications services with more than 5300 employees. We have hundreds of large customers, corporations in Germany and in other European countries. DT-ITS recieved the Best in Educational Cooperation award from HIPA in 2019, acknowledged as the the Most Ethical Multinational Company in 2019. The company continuously develops its four sites in Budapest, Debrecen, Pécs and Szeged and is looking for skilled IT professionals to join its team. About the Position We are looking for a highly skilled Java Developer with a strong security mindset to join a team building Germany’s next-generation Identity Provider platform for the national healthcare Telematics Infrastructure (TI). This platform enables millions of healthcare users to securely access digital health services and operates in one of the most security-sensitive and compliance-driven environments in Europe. As a Senior Java Developer, you will be responsible for designing and building highly secure backend services, authentication and authorization components, and security-critical platform capabilities. You will play a key role in ensuring that security is embedded into every stage of the software development lifecycle, from architecture and implementation to deployment and operations. This role is ideal for an experienced Java engineer who enjoys solving complex security challenges and building resilient, enterprise-grade software. Key Responsibilities Design, develop, and operate security-critical backend services using Java and Spring Boot. Build and maintain authentication and authorization services based on OAuth 2.0, OpenID Connect, and modern identity standards. Apply secure software engineering principles throughout the development lifecycle. Identify, assess, and mitigate security ri