Senior Network Engineer - Basildon

About Arc: Arc is a leading IT Managed Services Provider (MSP) based in the UK, delivering innovative and reliable IT solutions to businesses across various industries. With a strong reputation for excellence, we offer a range of services, including IT support, hybrid cloud solutions, cybersecurity, infrastructure management, PowerApps and AI. Our team is dedicated to delivering outstanding customer service and technical expertise to help businesses succeed. Role Overview As a Senior Network Engineer you will be a senior technical authority for the design, delivery and ongoing support of both our internal service-provider/datacentre network and our managed customer estates, working alongside our existing network and ISP engineering team. This is a hands-on senior role spanning routing, switching, firewalling and wireless across multiple vendors — with Fortinet (FortiGate / FortiManager) and Cisco (Nexus / ASR) at its core and a strong service-provider routing element built on BGP . You will own installation and migration projects end-to-end and play a key role in our 24x7 on-call rota covering CNI customers and our own ISP/datacentre platform. The role is a mix of office and home-based working, with customer site visits for installation and support. On-Call: Separate on-call allowance, plus paid callout payments — in addition to base salary Location: Basildon, Essex — hybrid (office based with WFH on occasion and customer site visits) Key Responsibilities • Own network installation and migration projects end-to-end, liaising with the Network Manager, Account Managers and customers • Maintain and develop our ISP and datacentre network, including core routing, peering/transit and edge connectivity • Configure, manage and troubleshoot a multi-customer Firewall deployments (ForitGate/FortiManager/Sophos XG) • Design, deploy and support Cisco Nexus (datacentre) and ASR (edge / service-provider) platforms • Own BGP design, peering, route policy and troubleshooting across internal and customer networks • Participate in the 24x7 out-of-hours on-call rota supporting CNI customers and our ISP/datacentre platform (on-call allowance and callout payments apply — see package details above) • Maintain and develop monitoring and alerting systems Essential Skills & Experience • Demonstrable senior-level network engineering experience within an MSP, ISP or service-provider environment • Fluent in BGP — design, peering, route policy and production troubleshooting • Strong Cisco routing and switching , including Nexus (NX-OS, datacentre/vPC) and ASR (IOS-XE / edge) • Solid Layer 2 / Layer 3 fundamentals — VLANs, trunking/tagging, STP, EIGRP, redundancy/HA design • Datacentre network experience — resilient core, structured cabling, copper and fibre optic types/connectors • Strong Firewall and Fortinet experience —Firewalling at scale with central management: – FortiManager – Zone-based firewalling and NAT – IPS, web and AV filtering policies – IPSec site-to-site and SSL VPN • Understanding of Internet connectivity types (FTTC / FTTP / leased line) and transit/peering concepts • Strong, methodical troubleshooting skills • Excellent customer-facing manner and clear technical communication • Full UK driving licence Desirable • Cisco CCNP (or equivalent) and Fortinet NSE / FCP certifications • Multi-vendor switching and wireless