Senior IT/OT Systems Engineer

Siemens Industry, Inc. is hiring a Senior IT/OT Systems Engineer in its Smart Infrastructure organization. The posting lists on-site locations in Buffalo Grove, Illinois, and Pleasant Prairie, Wisconsin, and describes the role as a fully on-site technical bridge between factory, manufacturing, and distribution-center IT and remote infrastructure engineering. In this peer-support role, you coordinate with the Senior Infrastructure Engineer and infrastructure team on standards, architecture, and managed systems, and with Factory IT Leads and production teams on day-to-day execution. Factory IT Leads retain ownership of factory-floor and distribution-center IT priorities; the Senior Infrastructure Engineer retains ownership of infrastructure architecture and standards. Responsibilities include serving as the on-site technical bridge with operations, infrastructure engineers, central managed services, and third-party machine vendors; coordinating network provisioning performed by managed services (switches, racking, cabling, and core configuration) while handling hands-on endpoint setup such as PCs; maintaining site-specific network architecture documentation; leading on-site cybersecurity vulnerability remediation and compliance, including patching windows coordinated with production schedules; maintaining IT/OT network segmentation by validating VLAN boundaries and firewall rules; managing compensating controls for legacy or unpatchable floor equipment; maintaining site asset inventories for audits, compliance, and cyber insurance; administering user access reviews and supporting privileged access management; confirming security requirements with machine vendors and managed service providers before network connection; gathering audit evidence and supporting company-wide security initiatives such as multifactor authentication and endpoint hardening; leading endpoint access and PC login administration; acting as the local technical escalation point for application performance issues affecting production and distribution operations; administering factory-specific applications and production-critical systems; leading site-level data, analytics, and digital enablement work; and supporting IIoT, OT communication protocols, edge computing, and cloud-connected OT infrastructure. Basic qualifications include a bachelor's or technical degree, or a minimum of 7 years of factory IT infrastructure experience; working knowledge of VLANs, switching, and basic firewall concepts; experience supporting vulnerability remediation, patching, and compliance; familiarity with IT/OT segmentation and working around production equipment and schedules; experience troubleshooting infrastructure, endpoints, or applications as an on-site escalation point; ability to work fully on-site and provide off-shift availability as needed; ability to travel regionally as required; proficiency in written and verbal English; and legal authorization to work in the United States on a continual and permanent basis without company sponsorship. Preferred qualifications include IT infrastructure experience in a manufacturing, industrial, plant, distribution-center, or R&D environment; administering production-critical applications; network architecture documentation and asset inventory management; privileged access management, user access reviews, cybersecurity audits, or compensating controls for legacy equipment; coordinating with managed service providers and machine vendors; and knowledge of IIoT, OT communication protocols, edge computing, data analytics, and cloud-connected OT infrastructure. The listed pay range is $105,533–$180,913 annually, with a target incentive of 10% of base salary. The posting is a full-time, permanent, office/site-only role. Posted 28 October 2026.