Hiring: Senior Network Engineer Company: Marathon Petroleum Corporation Location: Texas City, TX Job Posted Time: 2026-09-10 10:39:28 Employment Type: Full-time Target Skills & Keywords : Requirements Management, Risk Management, Subnetting About the job Experience: •5 or more years of relevant network engineer experience required. •Deep expertise in Layer 1 infrastructure, including structured cabling, copper and fiber standards, patch panels, optics, transceivers, rack layouts, cable management, labeling, testing, fiber troubleshooting, and related documentation required. •Advanced Layer 2 switching expertise, including VLANs, trunks, spanning tree, loop prevention, link aggregation, switch stacking, port security, access-layer resiliency, and enterprise switching design required. •Applied hands-on capability in enterprise switching platforms such as Cisco, Arista, or similar technologies required. •Proven ability to lead network projects, hardware refreshes, outage planning, vendor coordination, construction support, office moves, and safe cutovers in active operational environments required. Required Skills: •Lead the architecture, design, implementation, and lifecycle management of refinery business LAN infrastructure, including switching, structured cabling, fiber, network closets, telecom spaces, and related Layer 1 and Layer 2 components. •Develop and maintain LAN standards, reference designs, configuration baselines, cabling and labeling practices, resiliency patterns, and site implementation guidance. •Serve as a senior escalation point for complex LAN incidents, recurring reliability issues, performance concerns, design gaps, and high-impact outages affecting refinery business operations. •Troubleshoot and resolve Layer 1 and Layer 2 issues involving cabling, fiber, optics, patching, switch stacks, VLANs, trunks, spanning tree, link aggregation, port security, and access-layer performance. •Support Layer 3 integration with routed uplinks, gateways, subnet coordination, DHCP relay, firewall interfaces, wireless connectivity, and enterprise routing handoffs. •Lead LAN refreshes, lifecycle replacements, business expansion projects, construction support, office moves, turnaround planning, and remediation of aging infrastructure. •Partner with cybersecurity teams to strengthen segmentation, secure switch management, NAC or 802.1X readiness, logging, vulnerability remediation, and configuration compliance. •Maintain accurate technical documentation, including logical and physical diagrams, switchport records, patch panel mappings, fiber routes, VLAN assignments, inventories, rack elevations, and design decisions. Qualifications: •Bachelor’s Degree in Information Technology, related field or equivalent experience. •5+ years of relevant experience •As an energy industry leader, our career opportunities fuel personal and professional growth. •Bachelor’s degree in Information Technology, related field, or equivalent experience. Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!