Senior Network Engineer (L3)

Quantum Infotech Solutions; Singapore; On-site; SGD 70,000 - 110,000; Full time

Job summary

Quantum Infotech Solutions seeks a senior network engineer to implement and maintain Cisco routers, switches, IOS, and NAC solutions at client sites in Singapore. The role requires hands-on experience with Wireless networks, ISE/ClearPass, and firewall technologies, with CCNP as a strong plus.

You will support network operations, OS upgrades, security hardening, and engage with vendors for testing and preventive maintenance, ensuring 24x7 readiness when needed.

Qualifications

• Expert knowledge in Cisco routers and switches across all series.
• Strong Cisco IOS knowledge and NAC/ISE understanding.
• Experience with wireless controllers and Aruba ClearPass.
• CCNP certification or equivalent.
• Familiar with firewall products (Cisco ASA, FortiGate, Palo Alto).

Responsibilities

• Perform problem resolution, escalation and closure of incidents.
• Handle configuration changes and network operations at customer premises.
• Provide status updates to the service desk and tickets.
• Monitor network performance and bandwidth across the infra.
• Coordinate with vendor for testing and preventive maintenance.
• Apply OS upgrades and patching as required.
• Provide 24x5 on-site and 24x7 standby remote support for critical incidents.
• Maintain device inventory and certificates; manage security compliance.
• Engage third-party vendors to resolve hardware issues.

Skills

Cisco Routers

Cisco Switches

Cisco IOS

NAC

Aruba ClearPass

Cisco ISE

Wireless networks

OSI/TCP-IP

Level-2 support

CCNP

Network analytics

Firewall knowledge

F5 load balancers

Tools

Packet Tracer

Monitoring tools

Diagnostics tools

Job description

Required Key Skills

• Expert level knowledge in implementation and maintenance of Cisco Routers and Switches of all series.
• Good knowledge in Cisco IOS
• Good knowledge in implementation and operations support of NAC (Network Access Control)
• Good knowledge in Aruba Clear Pass / Cisco ISE
• Good knowledge in Wireless Network / Access Points / Controllers support and troubleshooting
• Expert level understanding of the OSI or TCP/IP model
• Provide Level-2 technical support and troubleshooting to resolve issues
• CCNP certification
• Hands-on experience with monitoring, network diagnostic, Packet Tracers and network analytics tools
• Good knowledge on Firewall Products like Cisco ASA, FortiGate, Palo Alto, Checkpoint
• Good knowledge on Aruba ClearPass/Cisco ISE, Cisco wireless controllers
• Knowledge on F5 load balancers

Priority Tasks

• Workplace is at customer premises and staff has to follow instituted Workplace securities
• Perform Problem resolution, escalation and/or closure of incident including problem analysis and identification of the source of the problem w.r.t Routing and Switching
• Perform configuration change activities
• Provide problem status to the Service Desk and/or update into the ticketing tool according to the Procedures Manual
• Perform day-to-day Network operation for the Network Infra-structure and Network Equipment at the customer premises, including performance monitoring, bandwidth monitoring.
• Work with customer's vendor to perform testing and preventative maintenance according to the schedule provided by the customer for the Network Equipment
• Perform periodic OS upgrade and Patching as and when required.
• 24X5 rotational shift onsite availability and 24X7 standby / remote support availability as and when needed for critical incidents.
• Perform Problem resolution, escalation and/or closure of incident including problem analysis and identification of the source of the problem
• Provide proactive incident reports for all Network related problems, faults, events within TWENTY-FOUR (24) hours
• Respond to all fault calls inclusive of emails and other forms of communications for Firewall related issues and problems reported
• Escalate the problem to Vendors Support in timely manner and get the issue resolved within the specified time as agreed with the customer
• Provide multi-vendor equipment support across a wide range of models and types of networking equipment
• Maintain the inventory of certificates and install/update/renew certificates as and when required.
• Perform security activities like hardening/periodic health check/ ID validation and other compliance activities as per IBM security policies and standards.
• Maintain/Update IBM inventory list and compliance related databases or similar Databases.
• Maintain the device inventory list for the client when needed, Maintain the software/firmware for all the devices up to date
• Subscribe to vendor notifications for the managed devices for vulnerabilities and review/validate/apply security patches pro-actively.
• Perform device activation / deactivation as per IBM service activation and deactivation process.
• Maintain the IP address inventory and allocate new IP address when required by business.
• Engage third part vendors to resolve hardware issues and follow up till closure
• Monitor vendor End of Life / End of Support notifications for all In Scope Devices and inform the client.