We are seeking a highly skilled and motivated Senior IT Systems Support Engineer to join our client''s global team. In this hands-on technical role, you will be responsible for supporting, maintaining, and enhancing mission-critical IT systems used in high-profile environments worldwide. You will play a key role in ensuring system stability, performance, security, and compliance while driving continuous improvement initiatives. The position also offers the opportunity to mentor junior engineers, collaborate with international teams, and contribute to the delivery of reliable and secure IT services.Key Responsibilities Provide 2nd and 3rd line support for business-critical systems.Troubleshoot complex issues, perform root cause analysis, and implement permanent solutions.Manage and maintain Windows Server environments, Active Directory, patching, backups, and security controls.Support change management, disaster recovery, and system upgrades.Automate operational tasks through scripting and process improvements.Collaborate with internal teams and external vendors.Create and maintain technical documentation.Mentor junior team members and promote best practices. Requirements 3+ years of experience supporting enterprise Windows environments.Strong knowledge of Windows Server, Active Directory, DNS, Group Policy, and virtualization technologies.Experience with Microsoft SQL Server administration and support.Familiarity with ITIL-based incident and change management processes.Excell