System Administrator (Infrastructure & Networking)

Tai Hing Worldwide Development Ltd; Sha Tin; On-site; HKD 300,000 - 520,000; Full time

Job summary

Tai Hing Worldwide Development Ltd is seeking a System Administrator (Infrastructure & Networking) to design, deploy, operate, and optimize the company’s on-premises and cloud infrastructure. You will manage servers, storage, virtualization, backup, and DR while enforcing security policies for core networking to ensure high availability.

Responsibilities include maintaining Windows/Linux servers, SAN/NAS, VMs, VPNs, firewalls, and incident response, plus documentation and cross-team

Qualifications

• 4+ years IT infrastructure operations experience with servers and networks.
• Experience managing Windows Server / Linux and virtualization platforms.
• Experience with backup, DR, and hybrid cloud environments.

Responsibilities

• Design, deploy, operate and optimize on-premises and cloud infrastructure.
• Manage Windows Server / Linux servers, virtualization, storage, and DR.
• Configure and maintain LAN/WAN, VPN, and security controls.
• Provide Tier-2/3 support and coordinate with vendors.
• Write SOPs and maintain technical documentation.

Skills

Analytical thinking

Incident response

Documentation

Communication

Education

Bachelor's degree in Computer Science or related field

Associate degree in related field

Tools

VMware vSphere

Hyper-V

KVM

Veeam

Fortinet

Palo Alto

Cisco switches

Job description

System Administrator (Infrastructure & Networking)

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.