Key Responsibilities： - Design, implement, and support enterprise network infrastructure across multiple sites. - Manage and maintain Cisco routers and switches, including configuration, upgrades, and troubleshooting. - Administer and optimise FortiGate firewalls, including policies, routing, VPNs, VDOMs, and security profiles. - Manage FortiManager and FortiAnalyzer for centralised configuration, logging, reporting, and ADOM management. - Perform advanced troubleshooting across IP networks, including packet‑level analysis and protocol diagnostics. - Work with data centre providers on cabinet layouts, power requirements, cross‑connects, and media types. - Coordinate with telecommunications carriers for leased line provisioning, installation, testing, and handover. - Integrate and support HP Synergy and Supermicro (SMC) SuperServer enclosures, including uplink design, fabric connectivity, and integration into core network infrastructure. - Maintain accurate network documentation, diagrams, and asset records. - Ensure network security best practices and compliance with organisational standards. What You Offer： - Minimum of 5 years’ hands‑on experience supporting enterprise networks, routing, switching, and firewall environments. - Deep technical capability, strong troubleshooting skills, and the ability to work with carriers, datacentres, and internal stakeholders. - Deep understanding of IP addressing, UDP, TCP/IP and traffic packet flow analysis, troubleshooting skills (TCPDump/Wireshark) - Routing protocols: BGP, EIGRP, static routing, route redistribution, NAT - Extensive experience with FortiGate firewalls, including VDOMs and ADOMs, Security policies and profiles, IPSec VPN, and High availability (HA) - Proficiency with FortiManager and FortiAnalyzer for centralised management and reporting. - Strong understanding of at least one operating system: Linux or Windows - Experience with HP Synergy and Supermicro SuperServer enclosures, including: Fabric modules and uplink configuration, Network integration into core switching - Knowledge of data centre infrastructure: Rack layouts and cabinet standards, Power (AC/DC, redundant feeds). Cross‑connects and fibre/copper media types - Experience working with telecom carriers on leased line orders, provisioning, and troubleshooting. - Strong documentation skills and ability to communicate technical concepts clearly. - Cisco certifications (CCNA, CCNP, or equivalent experience) and Fortinet NSE certifications (NSE4, NSE5, NSE6) are nice to have - Prior work in high‑frequency trading and financial services is nice to have - Fluency in English. Mandarin and Cantonese fluency are nice to have What We Offer： - Dynamic and collaborative work environment - A flat management structure where everyone’s voice is valued - Work-life balance within a multicultural environment - Fully stocked kitchen for breakfast and lunch - Attractive benefits package with a discretionary bonus