Senior Network Engineer

Job Description

We are looking for an experienced Senior Network Engineer to support a network switch migration project within a large-scale enterprise environment in Singapore. The successful candidate will be responsible for the planning, configuration, security hardening, migration, testing and post-implementation support of network switching infrastructure.

This role requires strong hands-on experience in network switch migration, network infrastructure configuration and network security hardening, with the ability to coordinate effectively with infrastructure, security, application and operations teams.

Key Responsibilities

Network Migration Planning & Design

• Review network architecture, design documentation and migration requirements.

• Validate switch hardware, software/firmware versions, licensing and compatibility.

• Develop detailed implementation, migration, testing and rollback plans.

• Identify technical dependencies, migration risks and outage requirements.

• Coordinate migration activities with security, server, application and operations teams.

Switch Configuration & Implementation

• Build and configure enterprise network switches according to approved designs and standards.

• Upgrade switch firmware and operating systems to approved versions.

• Review and validate existing network configurations before migration.

• Perform configuration backups and maintain appropriate rollback procedures.

Network Security Hardening

• Implement network security hardening in accordance with organisational security standards.

• Disable unused ports, protocols and services where applicable.

• Review switch configurations for security vulnerabilities and compliance requirements.

• Ensure configurations comply with internal security, governance and audit standards.

Monitoring & Alerting

• Integrate network switches with enterprise monitoring and alerting platforms.

• Configure and validate SNMP monitoring, Syslog forwarding and NetFlow/sFlow where applicable.

• Configure performance, capacity and interface utilisation monitoring.

• Ensure environmental monitoring for temperature, power supply and fan status.

• Configure appropriate operational alerts and validate that monitoring data is successfully received by monitoring platforms.

Migration Execution

• Conduct pre-migration validation and network health checks.

• Execute switch migrations according to approved implementation plans.

• Coordinate migration activities with relevant application and infrastructure teams.

• Minimise network downtime and business impact during migration activities.

• Troubleshoot and resolve migration-related network issues.

Testing & Validation

• Perform post-migration connectivity and functionality testing.

• Validate network services, interfaces and configurations following migration.

• Investigate and resolve issues identified during testing.

• Ensure successful completion of migration acceptance criteria.

Documentation & Release Readiness

• Create and maintain network diagrams, switch configuration records and port mappings.

• Maintain IP addressing, security configuration and monitoring documentation.

• Prepare implementation, testing and rollback procedures.

• Prepare required documentation for release readiness and implementation approval.

• Produce migration reports including validation results and stakeholder sign-off.

Post-Migration Support

• Provide post-implementation monitoring and technical support.

• Review network logs, alerts and performance for abnormalities.

• Optimise configurations where required.

• Conduct knowledge transfer and handover to operations teams.

• Obtain stakeholder sign-off following successful migration.

Requirements

• Minimum 10 years of relevant experience in network engineering, network infrastructure or similar roles.

• Strong hands-on experience in network switch migration and implementation.

• Strong knowledge of enterprise network infrastructure and switch configuration.

• Experience in network security hardening and security compliance requirements.

• Experience with network monitoring and alerting technologies including SNMP, Syslog and NetFlow/sFlow.

• Strong troubleshooting skills across enterprise network environments.

• Experience preparing network diagrams, configuration documentation, migration plans and rollback procedures.

• Experience supporting network changes within controlled release and change-management environments.

• Strong stakeholder management and cross-functional coordination skills.

• Ability to work independently and support migration activities within tight project timelines.