Senior Network Engineer

Senior Network Engineer Skip to main content#Senior Network Engineer page is loaded## Senior Network Engineer Apply locations:
Texas City, Texastime type:
Full time posted on:
Posted Todayjob requisition :
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** An exciting career awaits you
** At MPC, we’re committed to being a great place to work – one that welcomes new ideas, encourages diverse perspectives, develops our people, and fosters a collaborative team environment.# Position Summary Join Marathon Petroleum as a Senior Business LAN Network Engineer and help shape the secure, reliable network infrastructure that keeps our refinery business operations connected and moving forward. In this highly visible role, you will lead the design, architecture, implementation, lifecycle management, and advanced support of business LAN environments across complex industrial sites, with strong emphasis on Layer 1 physical infrastructure, Layer 2 switching services, and practical Layer 3 integration.

You will work on meaningful infrastructure challenges that directly support safe, reliable refinery operations while partnering with site IT, enterprise network engineering, cybersecurity, facilities, telecom providers, contractors, vendors, and business stakeholders.

This opportunity is ideal for a hands-on technical leader who wants to make a measurable impact in a collaborative, safety-focused organization that values integrity, inclusion, continuous improvement, and excellence. The successful candidate will influence LAN strategy and standards, strengthen resiliency, improve documentation and troubleshooting practices, mentor engineers, and drive outcomes in reliability, deployment speed, cost optimization, and operational risk reduction. If you enjoy solving complex problems, leading through influence, and building infrastructure that supports critical energy operations, this role offers the opportunity to contribute, grow, and make a difference at Marathon Petroleum.#

Key Responsibilities
* 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, switch port records, patch panel mappings, fiber routes, VLAN assignments, inventories, rack elevations, and design decisions.
* Coordinate changes with refinery operations, facilities, vendors, contractors, telecom providers, cybersecurity, enterprise network teams, and business stakeholders to minimize operational disruption.
* Set monitoring thresholds, analyze traffic and utilization trends, tune performance, identify root causes, and proactively reduce recurring network issues.
* Evaluate network hardware, platforms, tools, and emerging technologies to improve reliability, scalability, security, and operational efficiency.
* Provide technical leadership, mentoring, peer review, and guidance to engineers, site IT staff, contractors, and project teams while reinforcing safety, change…