Maintain routing, VLANs, network segmentation, VPNs, SD-WAN, and high availability; troubleshoot connectivity, wireless coverage, roaming, and performance issues.

·      Implement, administer, and troubleshoot Aruba ClearPass NAC, including 802.1X, RADIUS/TACACS+, device profiling, guest access, certificate-based authentication, and access enforcement.

·      Support IP telephony, VoIP, and centralised call centre infrastructure, including PBX connectivity, SIP trunks, call routing, QoS, and call-quality troubleshooting.

·      Secure workloads and applications across Azure, AWS, Alibaba Cloud, and Tencent Cloud, covering network protection, encryption, logging, web application firewalls, DDoS protection, and secure application publishing.

·      Administer identity and privileged access controls, including Microsoft Entra ID, MFA, Conditional Access, and PAM solutions such as Wallix.

·      Support Microsoft Defender and Intune security controls and their integration with NAC and security monitoring.

·      Coordinate with the SOC on monitoring coverage, incident investigation, response, and remediation; review service effectiveness.

·      Conduct security configuration reviews, coordinate vulnerability assessments and penetration testing, and track remediation and retesting.

·      Support Windows/Linux hardening and core infrastructure services, including Active Directory, DNS, DHCP, NTP, PKI, and TLS certificate management.

·      Monitor infrastructure availability and capacity; manage firmware updates, configuration backups, and changes with appropriate testing and rollback plans.

·      Support backup security, restoration testing, infrastructure failover, and disaster recovery planning.

·      Automate routine administration and security checks using PowerShell, Python, or infrastructure-as-code tools.

·      Maintain network diagrams, operating procedures, asset and licence inventories; coordinate vendor support, escalations, and renewals.

·      Support audits against applicable ADHICS, DoH, and DHA requirements, including evidence preparation, control validation, and closure of findings.