Singapore
Engineer - System Administrator (Contract) NCS (Via ES Recruitment) Performed vulnerability assessments and remediation using Tenable Nessus across virtual server environments, including patch management and OS hardening Produced weekly vulnerability reports, analyzing trends and prioritizing risk-based remediation Enforced compliance with Cyber Security Agency of Singapore Tier 1 standards by resolving security configuration gaps and aligning systems with enterprise baselines Investigated and remediated findings from Vulnerability Management Systems (VMS) in collaboration with security teams Troubleshot network and firewall issues impacting Citrix and secure application access, including VM-level firewall rule changes and coordination with firewall teams via service requests Supported DNS and endpoint environments to ensure secure and stable connectivity Managed identity and access issues using Active Directory, including user rights, authentication troubleshooting, and GPO-related escalations Supported authentication systems including 2FA and smart card access Provided L1/L2 Citrix support for secure access, resolving session, authentication, and connectivity issues Conducted DEV/QA validation to prevent production security risks Developed and modified PowerShell scripts for patching support, log analysis, and Active Directory data extraction to improve troubleshooting efficiency