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.