BMS & OT Systems Engineer

Join JLLs dynamic team serving one of the worlds largest banking and financial services organisations with a network spanning more than 50 countries and territories.Wereseeking talented professionals who thrive in fast-paced environments and are eager to drive meaningful change. This is an outstanding opportunity to work alongside industry experts that help shape the future of workplace strategy for a globally recognised institution.Whether you want a career that could take you to the top or an exciting new direction we offer opportunities support and rewards that will help you stand out fulfil your potential and ultimately make your mark on something truly exciting.

BMS & Operational TechnologySystems 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 deliveryincluding BMS servers supervisory software integration gateways controllers fieldnetworksand OT 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 stablesecureand 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 whilemaintainingoperational uptime.

This is not a pure cyber role. It is a controls engineering role with embedded resilience and cyber-awarenessresponsibilities.

Key Accountabilities

Operational 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/workstationreplacementand platform migrations.

• Support commissioning testing tuning and validation of control strategies alarmstrendsand system performance.

• Own engineering standards and technical quality for BMS works delivered by vendors/subcontractors.

• Ensure systemsremainsafereliableand performant in a live operational environment.

OT/BMS Network & Integration

• Support andmaintainOT/BMS connectivity including switches segmentationtopologyand OT integration pathways.

• Work with IT and network teams to ensure OT/BMS systems are integrated using approved patterns (segmentation boundary control remote connectivity).

• MaintainaccurateOT documentation including:

• Network diagrams/topology

• Panel/controllerdrawings and schematics

• OT asset registers and configuration records

• Support integration of OT-connected assets (e.g. meters UPS/generators chillers lightingcontrolsand specialist systems).

Resilience cyber & security

• Embed practical and maintainable security controls into OT engineering practice including:

• patch/update coordination for BMS serversgatewaysand OT workstations

• hardening / secure configuration of OT assets (where supported)

• account and access management for BMS platforms and engineering tools

• backup restore and recovery assurance for supervisory systems

• Ensure remote vendor access follows agreed approval processes and technical safeguards (secure pathways traceability timed access where possible).

• Support vulnerability management activities by assessing findingsadvisingpracticalremediationand coordinating execution during maintenance windows.

• Participate in resilience testing and assurance activities relating to the OT/BMS estate (e.g. recovery testing operational riskreviewsand audit readiness checks).

• Providepractical guidance to site teams and vendors to reduce operational risk while sustaining uptime.

Governance Change Control & Standards

• Enforce structured OT change control including technical review testing approach rollbackplanningand evidence capture.

• Ensure vendor workscomply withrequired technical governance including method statements access approvals commissioningrecordsand as-built documentation.

• Maintain configuration control and system baselines (versions controller backups databases golden builds).

• Provide reporting inputs to client stakeholders relating to OT system performance riskissuesand improvement delivery.

Stakeholder & Vendor Management

• Act as technical interface between:

• site operations teamsand apply hands on support

• BMS vendors / specialist service providers

• IT/network/security stakeholders

• client operational resilience representatives

• Review and approve BMS vendor technical proposalsdesignsand implementation plans.

• Drive consistent engineeringOTpractices and handover standards across sites.

Required Qualifications

Education

• Apprenticeship HNC/HNDBachelorsdegree or equivalent experience in:

• Building Services Engineering Electrical Engineering Control Systems Automation or similar.

EssentialsSkills& Experience

• Strong hands-on background in BMS / industrial controls engineering (multi-site operational estate preferred).

• Proven ability to diagnose commission and optimise BMS systems in live operational environments.

• Working knowledge of OT communications and integration protocols (e.g. BACnet Modbus OPCLonWorksor equivalents).

• Experience managing BMS/OT servers databasesbackupsand platform lifecycle.

• Strong understanding of OT engineering governance: documentation change control evidence-based commissioning.

• Comfortable working in critical environments where uptime safety and service continuity are key priorities.

Desirable Skills & Certifications

• Vendor platform training/certifications desirable (Trend / Siemens / Schneider / Honeywell / Tridium Niagara).

• Awareness of OT security principles such as segmentation access control remote connectivity controls patchgovernanceand recoverability.

• Familiarity with relevant guidance/frameworks (IEC 62443 NIST CIS) isadvantageousbut not essential.

• OT/cyber awareness certification (e.g. IEC 62443 fundamentals GIAC GICSP) desirable but not.

Core Competencies

• Strong troubleshooting discipline and engineering judgement.

• Methodical documentation and configuration management mindset.

• Effective communication with technical and non-technical stakeholders.

• Vendor management and delivery leadership.

• Able to balance operational continuity with improvement delivery (risk-aware structured approach).

What We Offer

• Competitive salary and comprehensive benefits package

• Professional development opportunities and support for continuing education including technology training

• Access tocutting-edgePropTechsolutions and innovation labs

• Leadership responsibility for three prestigious London flagship properties with high-profile client portfolios

• Exposure to diverse premium commercial properties across London and the UK

• Opportunity to shape engineering and technology strategy within a global real estate services leader

• Collaborative innovative work environment focused on delivering exceptional client experiences through technology