System Engineer (IoT Infra, Network & Server)

System Engineer (IoT Infra, Network & Server) L2–L3 Systems Engineering · Enterprise IoT · City of London (EC1) ? Location: City of London (EC1) — onsite ? Type: Contract · Inside IR35 ? Rate: Rate as per experience · Inside IR35 ? Level: L2 to early L3 ​ About the Role A hands-on systems engineering role supporting enterprise IoT deployments alongside broader infrastructure work. This is not a Windows admin or L1 support position — the client needs L2 to early L3 depth across devices, networks, servers, and SaaS platforms. You'll be involved in device configuration, patch testing, rollout activities, and troubleshooting across a mixed environment that includes IoT systems (building management, lighting, occupancy, air quality), Windows and Linux servers, and cloud/SaaS platforms. Requirements What You'll Be Doing • Supporting and implementing enterprise IoT/OT device infrastructure — config, maintenance, patching, troubleshooting • Translating architectural designs and requirements into operational implementations • Performing patch testing, deployments, and device validation • Troubleshooting complex issues across device, network, server, and platform layers • Managing migration, refurbishment, and new IoT platform rollout projects • Writing and maintaining runbooks, technical documentation, and operational guides • Ensuring compliance with enterprise security standards — auth, authorisation, encryption • Working with vendors and stakeholders to implement and future-proof systems ​ What We Need • Windows and Linux server administration • Networking: firewalls, load balancers, proxies, VLANs, subnets • IoT/OT device configuration, troubleshooting, and support across multiple platforms • SaaS platform experience, including SAML and OIDC • Security fundamentals: authentication, authorisation, encryption • Strong documentation skills — clear, maintainable, and auditable • Comfortable in a high-security, production enterprise environment