Senior Network Security Engineer

Location: Cleveland, OH Cleveland-Cliffs is seeking a hands-on Senior IT Network Engineer to design, deploy, and maintain the enterprise network, with a strong emphasis on the automation and observability solutions that keep it reliable, secure, and supportable. Reporting to the IT Network Manager and working alongside a team of experienced Network and Network Security Engineers, this senior role is automation-first — treating manual, repetitive work as a problem to be solved through code, orchestration, and intelligent tooling. The engineer brings a DevOps mindset to network operations (NetDevOps), applying version control, infrastructure-as-code, CI/CD pipelines, and automated testing to how the network is built, changed, and validated. Security is embedded in the work: the engineer builds visibility and automation that strengthen the organization's security posture and support rapid detection and response across corporate, mining, and steelmaking operations in a multi-site environment. As a senior member of the team, the engineer serves as a technical leader and mentor and is curious about how emerging AI-based technologies can improve network operations and security. Success in this role is measured by execution: automation delivered, visibility improved, and incidents detected and resolved quickly. This position is critical in supporting the success of Cleveland-Cliffs and provides excellent opportunity for career growth and progression. Summary of Responsibilities Develop, maintain, and optimize our monitoring and observability infrastructure — including monitoring, logging, and tracing capabilities — to ensure high availability, scalability, and security Design and build automation to streamline deployment, configuration, monitoring, and incident response, reducing manual effort and improving consistency across the environment Apply DevOps practices to network operations — including version control, infrastructure-as-code, CI/CD pipelines, and automated testing and validation — to deliver changes faster and more reliably Manage network configurations and automation code in source control, with peer review, change tracking, and repeatable, auditable deployment workflows Build and maintain security monitoring, alerting, and telemetry that improve threat visibility, support detection and response, and feed security operations and incident response workflows Automate security-related tasks such as configuration compliance, firewall and access policy validation, device hardening, and patch and firmware remediation to enforce cybersecurity standards at scale Apply AI-based technologies and analytics to improve anomaly detection, event correlation, root cause analysis, and predictive network operations Serve as a hands-on technical resource for complex configuration, troubleshooting, and escalation activities in production environments Execute automation and observability initiatives end to end — scoping, scheduling, tracking milestones, and delivering on commitment dates Partner with Cyber Security and plant engineering teams on secure network operations, including visibility and segmentation between IT and operational technology (OT) environments Support network security operations by providing the monitoring data, automation, and integrations needed for firewall, NAC, VPN, and segmentation technologies Continuously research, evaluate, and recommend new automation, DevOps, observability, security, and AI-driven tools and technologies that improve the reliability, security, and supportability of the network environment Report project status, risks, and operational and security metrics to leadership on a regular cadence Support a 24x7x365 fast-paced operational environment, including participation in on-call escalation Travel to other Cleveland-Cliffs locations as required (approximately 10%) Perform other duties as assigned; responsibilities may evolve with business needs, technical developments, or operational