Senior Network Engineer - Cisco, Juniper, Palo Alto - UK We are seeking an experienced Senior Network Engineer to join our Infrastructure team. This role is responsible for the design, implementation, optimisation, and support of a complex enterprise network environment. The successful candidate will have extensive experience with Cisco, Juniper, and Palo Alto technologies and will play a key role in delivering network transformation projects while providing third-line technical support and mentoring junior engineers. This will be a 12 months+ contract with on-site presence requested in Greater London, UK. Key Responsibilities Design, implement, and maintain enterprise LAN, WAN, WLAN, and data centre network infrastructure. Configure, manage, and troubleshoot Cisco, Juniper, and Palo Alto network and security solutions. Support business-critical production environments, ensuring maximum uptime and performance. Lead network infrastructure upgrades, migrations, and transformation projects. Monitor network performance, identify bottlenecks, and implement improvements. Configure and manage routing and switching technologies, including BGP, OSPF, EIGRP, STP, HSRP, and VRRP. Implement and support VPN technologies, SD-WAN, and secure remote connectivity. Manage Firewall policies, NAT, IPS, URL filtering, GlobalProtect VPN, and threat prevention using Palo Alto Firewalls. Produce and maintain detailed technical documentation, network diagrams, and operational procedures. ..... full job details .....