Senior Android Engineer (Kotlin / KMP)– Identity & Security (REF5702P)

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 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. We are looking for a highly skilled Senior Android Engineer to join a team building a next-generation Identity Provider platform that enables millions of users to securely access digital healthcare services. In this role, you will contribute to the development of a security-critical mobile identity solution, focusing on secure authentication, privacy protection, and cross-platform mobile engineering. You will work on a shared Kotlin Multiplatform (KMP) SDK that powers authentication services across Android and iOS applications. This is an excellent opportunity for engineers who are passionate about mobile security, modern Android development, and large-scale digital identity solutions. Key Responsibilities Design and develop a shared authentication SDK using Kotlin Multiplatform (KMP) Implement secure OAuth 2.0 and OpenID Connect (OIDC) authentication flows Develop modern and scalable user interfaces using Jetpack Compose Implement mobile security best practices, including: Hardware-backed key management Secure credential storage App integrity verification Build and maintain white-label SDK and application variants Support CI/CD pipelines and release automation processes Collaborate closely with backend, security, QA, and DevOps teams Participate in architecture discussions, code reviews, and technical documentation Ensure high standards in software quality, security, and maintainability 4+ years of Android development experience Strong expertise in: Kotlin 2.x Android SDK Jetpack Compose Kotlin Multiplatform (KMP) Experience implementing: OAuth 2.0 OpenID Connect (OIDC) Experience building SDKs or reusable libraries CI/CD knowledge Git and modern software development workflows Strong understanding of mobile security principles Experience with testing, code reviews, and quality assurance practices Fluent English, both written and spoken Advantages: Compose Multiplatform experience iOS development knowledge Swift or SwiftUI experience Contract testing experience Electronic identity (eID) integrations Digital healthcare or identity management domain knowledge Experience in regulated or security-critical environments Familiarity with: Digital identity platforms Authentication technologies Privacy and compliance requirements Technology Stack Languages & Frameworks Kotlin 2.x Kotlin Multiplatform (KMP) Jetpack Compose Compose Multiplatform Swift / SwiftUI (nice to have) Security OAuth 2.0 OpenID Connect (OIDC) Hardware-backed cryptography Secure key management Development Tools Git CI/CD Pipelines Automated Testing Code Review Processes What We Offer Opportunity to build a high-impact platform used by millions of users Work with a modern technology stack and engineering practices Exposure to digital identity, cybersecurity, and healthcare technologies Collaborative and knowledge-driven engineering culture Opportunities for professional growth and career development International and multicultural working environment * Please be informed that our remote working possibility is only available within Hungary due to European taxation regulation.