System Administrator (Infrastructure & Networking)

Job Summary

Responsible for designing, deploying, operating, and optimizing the company’s on‑premises and cloud infrastructure, covering servers, storage, virtualization, backup, and disaster recovery. Also accountable for day‑to‑day management and security policy enforcement of core networking (LAN/WAN, Wi‑Fi, firewalls, VPN, etc.) to ensure high availability and compliance.

Key Responsibilities

• Systems & Infrastructure Management

  • Manage Windows Server / Linux servers, virtualization platforms (VMware / Hyper‑V / KVM), and SAN/NAS storage systems, including capacity planning, performance tuning, and lifecycle management (patching, upgrades, EOL replacements).

  • Design and implement backup, restore, and disaster recovery (DR) strategies; conduct regular tests and maintain documentation.

  • Support hybrid cloud environments (e.g., Azure / AWS / Alibaba Cloud) for VM, networking, and storage configuration and operations.

• Network & Security Operations

  • Configure and maintain LAN/WAN, VLANs, routing and switching, wireless (Wi‑Fi), DNS, DHCP, IPAM, and site‑to‑site / remote‑access VPN.

  • Manage firewalls, load balancers, and related security policies (e.g., Fortinet, Palo Alto, F5), coordinating vulnerability scanning, compliance checks, and remediation.

  • Implement identity and access management (AD DS, SSO, MFA), endpoint protection, log monitoring, and incident response to meet company security baselines and audit requirements.

• Operations & Support

  • Monitor system and network performance and availability; proactively troubleshoot issues to minimize downtime.

  • Provide tier‑2 / tier‑3 technical support, handle escalated cases, and collaborate with external vendors to resolve problems.

  • Manage backend configuration and integration for M365, email, VoIP, and collaboration tools as required.

• Projects & Documentation

  • Participate in infrastructure upgrade, migration, and automation projects (e.g., OS upgrades, SAN replacement, cloud migration).

  • Write and maintain SOPs, technical documentation, asset inventories, and change management records.

  • Collaborate with application development, DevOps, and security teams to support system integration and environment delivery.

Requirements

• Education & Experience

  • Associate degree, bachelor’s degree, or above in Computer Science, Information Engineering, or a related field.

  • 4+ years of IT infrastructure operations experience, with hands‑on experience managing both servers and networks.

• Technical Skills (adjust as needed)

  • Servers / Virtualization: Windows Server, Linux (RHEL/Ubuntu), VMware vSphere / Hyper‑V / KVM.

  • Storage & Backup: SAN/NAS, backup software (e.g., Veeam).

  • Networking: Cisco/Huawei/Aruba switches and routers, Wi‑Fi controllers, firewalls (Fortinet/Palo Alto), VPN, DNS/DHCP.

  • Cloud: Basic services on Azure / AWS / Alibaba Cloud (VM, VNet/VPC, Storage, Backup).

  • Automation & Scripting: PowerShell, Bash, or Python for task automation.

  • Security & Compliance: AD, GPO, MFA, endpoint protection, logging and monitoring tools; familiarity with ISO 27001 or similar frameworks is a plus.

• Soft Skills & Others

  • Strong analytical and problem‑solving skills; able to work under pressure and handle incidents.

  • Good communication and documentation skills; able to collaborate effectively with business units and vendors.

  • Fluent in English and Cantonese; Mandarin is a plus.

  • Relevant certifications (CCNA/CCNP, MCSE, RHCE, VCP, Fortinet NSE, etc.) are a plus.