Senior Network Consultant- Contract

QUESS SELECTION & SERVICES PTE. LTD.; Singapore; On-site; SGD 180,000 - 240,000; Full time

Job summary

QUESS SELECTION & SERVICES PTE. LTD. is seeking a Senior Network Consultant with deep hands-on experience in designing, implementing and managing complex enterprise networks across mission-critical environments.

You will lead multi-vendor deployments, optimise L2/L3 architectures, ensure security and resilience, and mentor engineers while engaging with stakeholders and customers on presales and delivery. The role demands 15+ years in enterprise networking, strong leadership, and proven

Qualifications

• 15+ years in enterprise network engineering and operations.
• 5+ years in senior technical or team leadership.
• Hands-on with multi-vendor networks (Cisco, Juniper, Fortinet, others).
• Experience in mission-critical environments (banking, healthcare, data centres).

Responsibilities

• Lead implementation, configuration and lifecycle management of enterprise LAN/WAN/data centre networks.
• Provide advanced support across Cisco, Juniper, Fortinet and other vendors.
• Design Layer 2/3 switching, VLANs, RT, QoS and redundancy.
• Troubleshoot routing, security policies and wireless networks.
• Coordinate migrations, upgrades and IMAC activities.
• Mentor network engineers and lead customer engagements.

Skills

Multi-vendor networking

Routing & Switching

Network security

Wireless infrastructure

WAN connectivity

Technical leadership

Stakeholder management

Education

Bachelor's degree in IT/CS/CE/Telecom

Tools

Cisco

Juniper

Fortinet

Extreme Networks

Cisco Meraki

Aruba

Ruckus

Job description

We are seeking a highly experienced Senior Network Consultant with extensive hands- on expertise in designing, implementing, managing and troubleshooting complex enterprise network infrastructures across mission-critical environments.

The successful candidate will possess deep technical competencies in multi-vendor routing, switching, network security, wireless infrastructure and WAN connectivity, with proven experience supporting large-scale network deployments across highly demanding industries such as banking, financial services, healthcare and data centres.

This role requires a combination of advanced technical troubleshooting, infrastructure project delivery, technical consultancy, stakeholder management, presales engagement and leadership capabilities.

Key Responsibilities

• Enterprise Network Infrastructure & Architecture
• Lead the implementation, configuration, optimisation and lifecycle management of complex enterprise LAN, WAN and data centre network infrastructures.
• Provide advanced technical support for heterogeneous network environments incorporating Cisco, Juniper, Fortinet, Extreme Networks and other enterprise networking technologies.
• Design, deploy and maintain Layer 2 and Layer 3 switching architectures, including VLAN segmentation, inter-VLAN routing, trunking, Spanning Tree Protocol and network redundancy.
• Implement and troubleshoot dynamic routing protocols, including BGP, OSPF and MPLS-based WAN connectivity.
• Support IP addressing, TCP/IP connectivity, DHCP services, Quality of Service (QoS) and network traffic optimisation.
• Perform network infrastructure migrations, hardware refreshes, system upgrades and installation, move, add and change (IMAC) activities.
• Maintain high availability, network resilience and service continuity across business-critical infrastructure environments.

Multi-Vendor Network Security & Infrastructure Support

• Deploy, configure, maintain and troubleshoot enterprise network security appliances, particularly Cisco ASA and Fortinet firewalls.
• Support network security policies, firewall rule configurations, access controls and secure network segmentation.
• Work across integrated routing, switching, firewall and wireless environments to identify and resolve complex connectivity and performance issues.
• Support network security incident investigations, technical escalations and remediation activities.
• Collaborate with infrastructure and security teams to ensure network implementations align with organisational security standards.

Advanced Troubleshooting & Incident Management

• Act as a senior technical escalation point for complex network incidents affecting enterprise and mission-critical customer environments.
• Diagnose and resolve multi-layer network issues involving routing protocols, switching, WAN connectivity, firewall policies, wireless infrastructure and network performance.
• Conduct root cause analysis for recurring incidents, service interruptions and infrastructure failures.
• Provide technical support during planned and unplanned outages, network maintenance and emergency restoration activities.
• Coordinate technical escalations and hardware replacement processes with multiple technology vendors and OEM support teams.
• Participate in after-hours maintenance, incident response and critical infrastructure recovery activities when required.
• Work on a 24/7 rotating shift schedule to provide continuous network monitoring

Enterprise Wireless & Network Integration

• Implement and maintain enterprise wireless infrastructure incorporating Wireless LAN Controllers (WLC), wireless access points and associated network services.
• Support multi-vendor wireless technologies, including Cisco Meraki, Aruba, Extreme Networks and Ruckus.
• Troubleshoot wireless connectivity, network access, performance and integration issues.
• Support the integration of wired and wireless networks within complex enterprise environments.

Technical Consultancy, Presales & Project Delivery

• Provide technical consultancy and solution recommendations for enterprise network infrastructure projects.
• Participate in presales activities, including technical solution discussions, site surveys, tender specification reviews and bid clarification sessions.
• Collaborate with sales teams, project managers, engineers, technology partners and customers to translate business requirements into practical network solutions.
• Lead or coordinate infrastructure deployment, migration, commissioning and acceptance testing activities.
• Support project cost estimation, resource planning and financial considerations relating to network infrastructure delivery.
• Ensure project milestones, technical deliverables and customer requirements are met.
• Prepare and maintain network architecture diagrams, configuration records, technical documentation, project workbooks and maintenance records, technical documentation, project workbooks and maintenance.

Technical Leadership & Customer Engagement

• Provide technical guidance, mentoring and knowledge transfer to network engineers and support personnel.
• Lead technical discussions with customers, internal stakeholders and external technology partners.
• Drive continuous improvement in network operations, service quality and troubleshooting procedures.
• Maintain strong customer relationships through effective communication, incident ownership and timely resolution of technical issues.
• Support the development of technical standards, operational documentation and knowledge-sharing initiatives.

Educational Qualifications

• Bachelor's Degree in Information Technology, Computer Science, Computer Engineering, Telecommunications or a related technical discipline.
• Equivalent professional qualifications supported by substantial relevant enterprise networking experience may also be considered.

Professional Experience

• Minimum 15 years of relevant experience in enterprise network infrastructure, network engineering, technical consultancy, systems integration or network operations.
• At least 5 years of experience in a senior technical, consultancy or team leadership capacity, handling complex enterprise networking environments.
• Extensive hands-on experience in implementing, administering and troubleshooting multi-vendor enterprise network infrastructures involving Cisco, Juniper, Fortinet and other networking technologies.
• Proven experience supporting mission-critical network environments within banking, financial services, healthcare, data centres or similarly complex enterprise environments.
• Demonstrated experience in enterprise routing and switching, network security, wireless infrastructure, incident escalation and infrastructure project delivery.
• Experience in technical presales, tender support, customer-facing consultancy and coordination of network infrastructure implementation projects.
• Previous experience providing technical guidance, mentoring or leadership to network engineering teams would be advantageous.