Senior Network Systems Engineer - Train Control & SCADA Operations

Senior Network Systems Engineer Randstad is seeking a highly experienced Senior Network Systems Engineer to support and maintain mission-critical Train Control and SCADA systems for a major transportation client in Philadelphia, PA. This role involves administering and upgrading network infrastructure, RedHat and Windows-based systems, and ensuring 24/7 availability and cybersecurity of real-time train control operations. The ideal candidate has deep experience with SCADA environments, network architecture, and infrastructure security, and thrives in a high-stakes, collaborative setting with both technical teams and operational leadership. Key Responsibilities: Lead technical efforts to maintain and enhance Train Control and SCADA system infrastructure. Ensure 24/7 availability of four critical Train Control System facilities and their supporting network infrastructure. Administer and configure RedHat and Windows-based systems for high availability and security. Manage, maintain, and troubleshoot routers, switches, and firewalls in support of a fault-tolerant communications network. Plan and execute software and hardware upgrades for servers, workstations, and network equipment. Develop, implement, and monitor network security policies and practices. Interface with internal and external technical specialists to resolve system issues and plan enhancements. Create and maintain system documentation, network diagrams, and troubleshooting procedures. Support emergency technical response and rotating on-call responsibilities. Assist with developing procedures and documentation to improve operational readiness and response. Software Technology Inc