Markus Renelt-Haller

Leading a 55‑person tribe for Service Desk, Workplace, Collaboration, Infrastructure and 24/7 Operations. Responsible for private cloud, virtualization and hybrid infrastructure. Driving automation, AI, quality and governance improvements. Member of the OESC leadership team. Focus on service reliability, organizational structure, budget ownership, cost transparency and continuous improvement.

Tribe Lead IT Infrastructure - Service Delivery, - Infrastructure Run, - IT Operations, - Application Operations, - Client Operations, - Service Management, - IT Architecture, - Project Management, - 3rd Level Support, - Process Design, - Customer Management, - External Partner Management, - Security Operations, - Escalation Management

Responsible for operational security for 4,000–4,500 endpoints, including SIEM/EDR rollout and vulnerability reduction. * EDR & SIEM rollout, 99% reduction in critical vulnerabilities * Coordinated cross-unit incident response * Ensured 24 months without critical security incidents * Managed policy implementation and security controls

Led cloud onboarding, automation and regional infrastructure initiatives. * Accelerated provisioning by 60% through automation * Standardized Jira, Confluence and O365 platforms * Managed budgets and cross-border processes * Supported onboarding of 4 CEE regions and >1500 users

Modernized retail tools and analytics platforms. * Migrated 100% legacy tools to standardized platforms * Reduced maintenance costs by 25% * Implemented automated reporting (PowerBI, SAS)

Responsible for application delivery and workplace services across 4 regions.

Team-Leader On Site Service Techniker bei ATOS Leistungen: - Umsetzung mehrerer Dienstleistungsprojekte bei verschiedenen Kunden (Infrastruktur, OS, Übersiedlungen, Applikationen, Hersteller) - Aufstieg zum Teamleiter, Senkung der Verwaltungskosten für Lohn- und Gehaltsabrechnungen, Sicherstellung der Fortführung und Verbesserung der Dienstleistungen. Aufgabenbereiche: - 1st & 2nd Level Support - Infrastrukturwartung - Kundenmanagement - Lagermanagement (CMDB & Abrechnung) - Dokumentation