BMS & OT Systems Engineer

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BMS & Operational Technology Systems Engineer - London Based JLL is seeking an experienced BMS & Operational Technology (OT) Systems Engineer to support the reliability, performance, resilience and secure operation of building management and control systems across a critical London portfolio. 65 The role is principally focused on BMS / industrial controls engineering delivery-including BMS servers, supervisory software, integration gateways, controllers, field networks and OT connectivity.

In addition, the role will provide resilience and security assurance, ensuring OT/BMS systems are managed in a controlled, standardised and risk-aware manner in line with client operational resilience expectations. This position works closely with operational engineering teams, IT/network teams, BMS service providers and client stakeholders to deliver stable, secure and auditable building controls operations. What this job involves :
As a BMS & OT Systems Engineer (Resilience & Security) you will take technical ownership of the OT/BMS estate within a multi-site critical portfolio. You will provide hands-on engineering support, manage specialist vendor delivery, and embed structured controls for secure access, patch governance and recoverability while maintaining operational uptime. This is not a pure cyber role. It is a controls engineering role with embedded resilience and cyber- aware ness responsibilities.

Key Accountabilities Oper ational Technology Operations & Engineering Act as engineering lead for the day-to-day health and integrity of BMS/OT platforms across the portfolio. Support BMS fault diagnosis, performance optimisation and strategy improvements across plant and systems. Lead lifecycle engineering activities including software upgrades, controller refresh, server/workstation replacement and platform migrations. Support commissioning, testing, tuning and validation of control strategies, alarms, trends and system performance.

Own engineering standards and technical quality for BMS works delivered by vendors/subcontractors. Ensure systems remain safe, reliable and performant in a live operational environment. OT/BMS Network & Integration Support and maintain OT/BMS connectivity including switches, segmentation, topology and OT integration pathways. Work with IT and network teams to ensure OT/BMS systems are integrated using approved patterns (segmentation, boundary control, remote connectivity).

Maintain accurate OT documentation including:
Network diagrams/topology Panel/controller drawings and schematics OT asset registers and configuration records Support integration of OT-connected assets (e.g., meters, UPS/generators, chillers, lighting controls and specialist systems). Resilienc e, cyber & security Embed practical and maintainable security controls into OT engineering practice, including: patch/update coordination for BMS servers, gateways and OT…