Senior Active Directory Infrastructure Engineer at qualysoft

Founded in 1999 in Vienna, the Qualysoft Group is a manufacturer-independent IT consulting and services company, which successfully provides support for its international customers with the aim of boosting their competitiveness and economic efficiency through innovative IT solutions. Its focus is on financial services providers, telecommunications companies, the automotive industry and energy service providers. Over 400 employees in 6 subsidiaries work together to ensure state of the art solutions for our clients. We are looking for new colleagues in Qualysoft teams for diverse projects providing continuous learning opportunities. Our common goal is to provide honesty, development and a stable background while getting to know the latest technologies. We are waiting for your application for the position below! Responsibilities • Support and contribute to Active Directory design, upgrades, and troubleshooting activities in complex enterprise environments • Drive migration of legacy Citrix systems to modern cloud or hybrid platforms, with strong consideration of AD dependencies and integrations • Troubleshoot and resolve complex infrastructure issues, with a primary focus on Active Directory-related problems (authentication, GPOs, replication, DNS dependencies) • Optimize performance, user experience, and resource utilisation across AD-integrated systems and Citrix platforms • Support disaster recovery and business continuity planning, especially for Active Directory and its dependent services • Participate in structured decommissioning of legacy systems, ensuring clean separation from AD where required • Maintain accurate technical documentation (architecture diagrams, configurations, runbooks), particularly around AD structure and integrations • Collaborate with infrastructure, application, and security teams to ensure stable and secure service delivery • Participate in governance, reporting, SLA tracking, and service reviews • Work with vendors and third-party support providers when required • Mentor L2 analysts and junior engineers, especially in Active Directory troubleshooting and best practices • Drive continuous improvement and automation in operational processes • Manage Citrix Cloud environments (Delivery Groups, Machine Catalogs, policies, VDA image lifecycle) Requirements • Strong hands-on experience with Active Directory, focusing on troubleshooting, upgrades, and design-level understanding • Solid knowledge of AD core services (authentication flows, Group Policy, DNS, replication, trusts) • Experience working in enterprise and hybrid AD environments • Ability to diagnose and resolve complex AD-related issues impacting infrastructure and applications • Experience with AD upgrade, consolidation, or migration projects • Working knowledge of Citrix environments (Citrix Cloud experience is an advantage, but not the primary focus) • Experience with hybrid infrastructure environments • Strong troubleshooting and performance tuning skills • Familiarity with disaster recovery planning for AD-dependent systems • Understanding of structured migration and decommissioning practices • Good communication and stakeholder management skills Why we think you will love working here: With us you count as a person, our doors are always open. We live the Qualysoft Team Spirit and stand for transparency! Fresh wind and new ideas are welcome, because standstill is a foreign word at Qualysoft.