Senior Network Engineer

Senior Network Engineer (SonicWall Migration) Location: Hampshire (Hybrid) Rate: Outside IR35, competitive based on experience Contract: Initial 2 Months Immediate Start We are looking for an experienced Senior Network Engineer to lead a business-critical network infrastructure relocation and SonicWall firewall migration project. This is a hands-on delivery role requiring proven experience with SonicWall firewalls, VPN configuration, routing, switching and network cutovers. The successful consultant will take ownership of migrating an existing SonicWall NSa 2700 to a new NSa 2800, ensuring minimal disruption to business operations. Key Responsibilities

• Lead the discovery, design and delivery of the network migration.
• Review and document the existing firewall, routing, VLAN, NAT, DHCP and VPN environment.
• Configure and migrate an existing SonicWall NSa 2700 to a SonicWall NSa 2800.
• Configure and validate site-to-site VPN connectivity between offices, Azure and third-party environments.
• Migrate and support SSL VPN remote access services for approximately 150-180 users.
• Configure firewall policies, security rules, routing, NAT and DNS settings.
• Build and test the new environment alongside the existing infrastructure.
• Produce migration plans, testing procedures and rollback documentation.
• Lead the network cutover and troubleshoot firewall, VPN and connectivity issues.
• Provide post-migration support and technical handover. Essential Skills & Experience
• Strong hands-on experience with SonicWall firewalls, ideally NSa appliances.
• Proven experience delivering SonicWall firewall migrations, upgrades or replacements.
• Extensive experience configuring and troubleshooting:
• Site-to-Site VPNs
• IPSec VPNs
• SSL VPNs / NetExtender
• Strong understanding of routing, switching, VLANs, NAT, DHCP and DNS.
• Experience connecting on-premise environments into Microsoft Azure.
• Previous experience delivering network relocation, migration or infrastructure cutover projects.
• Ability to independently plan, configure, test and implement network changes.
• Strong technical documentation and stakeholder communication skills.
• SonicWall NSa 2700 / NSa 2800
• Azure VPN Gateway and hybrid networking
• Ubiquiti UniFi switching and wireless
• Check Point firewalls
• Leased lines, internet circuits and data centre connectivity
• Experience supporting business-critical environments with minimal downtime