Senior IT Infra Engineer, Singapore

Our client is a leading mobile network operator that runs Singapore's connectivity. The IT team is lean and senior, meaning less bureaucracy, more ownership. This is a hands-on role across network engineering, systems, cloud, and security, working closely with the Cybersecurity team in a compliance-driven environment. Responsibilities Design and administer network infrastructure - routing, switching, firewalls, VPNs, NAC, wired and wireless Manage Windows Server, Linux, and virtualisation platforms (VMware, Hyper-V), including NAS, SAN, and vSAN Administer M365 services (Entra ID, Intune, Exchange Online, Teams) and hybrid AD/Entra identity Own monitoring tools (Grafana, Zabbix, PRTG, Nagios), patching cycles, migrations, and documentation Enforce security best practices - segmentation, CIS hardening, PAM/IAM control Implement M365 security controls, audit logging, and ensure regulatory compliance Operate across incident, problem, and change management within ITSM frameworks Requirements Min 6 years in network engineering,
IT infrastructure , and systems administration Networking: routing, switching, VLANs, ACLs,
firewalls , VPNs, NAC (Cisco, Aruba, Palo Alto, Fortinet, F5) Systems: Windows Server,
RHEL, VMware, Hyper-V , NAS/SAN/vSAN, M365 Monitoring & Ops: Zabbix, Grafana, PRTG, Nagios, Veeam, ITSM, PAM, SIEM Proven experience in system hardening, patch management, and security compliance Background in a regulated environment - fintech, finance, or telco preferred Certifications: CCNA, RHCE, MCSE, VCP or equivalent Docker / Kubernetes exposure a plus