Deutsche Telekom IT Solutions Slovakia is hiring a Senior Cyber Security Defender Engineer with German (m/f/d)

Purpose We are looking for a senior technical expert responsible for the design, implementation, and operation of security technologies, software deployment, and data center operations. The candidate will play a key role in ensuring high availability, security, and performance of IT infrastructure. Team description Join the team at Operational Services GmbH, within Deutsche Telekom Systems Solutions Slovakia, providing opportunities for talented IT professionals in Slovakia. OS is one of the leading ICT service providers in the German market and is considered the backbone of digitization for medium-sized companies. With almost 1,000 highly qualified employees, OS develops and operates state-of-the-art IT systems for our customers, ensures long-term system support, and maintains the availability of critical business processes. If you are excited to join an English and German-speaking team that values innovation and teamwork, our team would be the perfect fit for you. WHAT WILL YOU DO? - Operate, maintain, and troubleshoot security solutions in data center and hybrid/cloud environments. - Handle incident, change, and problem tickets related to security systems. - Deploy, configure, and maintain Microsoft Defender, Sophos, and related security tools. - Continuously improve the reliability, performance, and security of IT services. - Collaborate with internal teams, customers, and vendors on implementation projects. - Support onboarding, training, and documentation for security tools and procedures. Scope of Work: - Work independently or as part of the team to implement and maintain security solutions. - Operate and manage Microsoft Defender (Endpoint, Cloud, Identity, Cloud Apps, O365). - Operate and manage Sophos Intercept X (EDR/XDR) and Sophos SG/XG Firewalls. - Install, configure, and maintain security-related tools and monitoring systems. - Ensure security policies and best practices are implemented across infrastructure (servers, networks, cloud, endpoints). - Some training can be provided if required, but a strong foundational knowledge is essential.