Network Engineer (Tier 2)

RED ALPHA CYBERSECURITY PTE. LTD.; Singapore; On-site; SGD 60,000 - 100,000; Full time

Job summary

RED ALPHA CYBERSECURITY PTE. LTD. seeks a seasoned Network Engineer to design, implement, and support enterprise networks with high availability. You will handle core routing, switching, load balancing, and perimeter security while driving efficiency across operations.

Responsibilities include incident triage, RCA, firewall policy execution, patch management, and regulatory compliance. Collaborate with vendors and cross-functional teams to deliver network projects on schedule.

Qualifications

• 3+ years hands-on network engineering experience in enterprise environments.
• Data-driven troubleshooting across complex infrastructures.
• Ability to communicate technical status clearly to non-technical stakeholders.
• Strong teamwork, reliability, and process optimization mindset.

Responsibilities

• Configure, test, and deploy LAN/WAN/VLAN changes using playbooks.
• Triage Tier 2 incidents, perform RCA, and escalate to vendors as needed.
• Apply firewall policies, manage patches, and ensure regulatory compliance.
• Maintain topology diagrams, SOPs, and asset lifecycle records.
• Coordinate network requirements for cross-functional IT projects.

Skills

Routing & WAN

Switching & L2

Perimeter Security

ACLs & VPNs

Project Coordination

Tools

Cisco IOS/Cisco Switch/Router

F5 BIG-IP

Checkpoint Firewall

Job description

Role Overview

We are seeking an experienced Network Engineer to manage network design implementation, Tier 2 operational support, security compliance, and infrastructure project delivery. In this role, you will maintain high availability across core routing, switching, load balancing, and perimeter security while continuously optimizing operational workflows.

Key Responsibilities

• Configure, test, and deploy standard LAN/WAN/VLAN changes using established playbooks. Execute scheduled maintenance windows, performance monitoring, and Change Requests (CRs) with clear rollback procedures.
• Triage network alerts, resolve Tier 2 incidents using structured troubleshooting models (OSI layer), conduct Root Cause Analysis (RCA), and escalate to external vendors (Cisco TAC, F5, Checkpoint) when necessary.
• Apply firewall policies, ACLs, and port security adhering to least-privilege principles. Execute routine firmware/OS patches to remediate CVEs, manage SSL/TLS certificate renewals, and maintain regulatory compliance.
• Maintain real-time topology diagrams, logical rack layouts, SOPs, and troubleshooting playbooks. Audit infrastructure baseline configurations and manage asset lifecycle/decommissioning.
• Provision network requirements (VLANs, routing, security rules) for cross-functional IT projects on schedule while enforcing project scope boundaries and change governance. Coordinate effectively with hardware and ISP vendors.

Technical Requirements & Product Mastery

• Routing & WAN
  • BGP, OSPF, enterprise WAN platforms, circuit health monitoring, and edge ISP routing.
• Switching & HCI Underlay
  • Cisco Switch/Router, Cisco ACI, STP, Layer 2, Link Aggregation (LACP), and VLAN Trunking.
• Perimeter Security & Firewalls
  • Checkpoint, NAT rules, IPSec VPN tunnels, traffic/threat logs, and standard ACLs.
• Access Control & Security
  • 802.1X / MAB authentication troubleshooting, policy set updates, and port security.
• Application Delivery
  • F5 load balancers (virtual servers, pools, health monitors, SSL/TLS profiles).
• Diagnostic & Tools
  • Ping, Traceroute, nslookup, iperf, traffic analysis, and DNS/AD/Storage service mapping.

Qualifications & Soft Skills

• Experience: At least 3 years of hands‑on experience in network engineering, network operations, or a similar enterprise infrastructure role.
• Problem Solving: Data‑driven troubleshooting approach with strong cognitive flexibility across enterprise infrastructure ecosystems.
• Communication: Ability to articulate complex technical statuses and updates clearly to non‑technical stakeholders.
• Work Ethic & Collaboration: High operational reliability, clean shift handovers, process optimization mindset, and active teamwork under pressure.