Senior Network Engineer

Texas City, Texas Full time 00023278 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, switchport 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 control, cybersecurity, and operational risk management practices. Deploys complex network configurations for on-premise or cloud-based networks and assists in the development of playbooks for network systems. Assists in the integration of new systems and tools. Develops and maintains scripts to facilitate network administrative tasks and automate repetitive processes. Sets the requirements and thresholds for monitoring systems for network devices. Participates in troubleshooting sessions for network-related issues at all layers of the OSI model. Monitors performance, identifies areas for improvement for the network and implements performance tuning. Identifies trends in issues and determines the root cause to reduce future issues. Adheres to network policies, standards, and standard operating procedures for how-to documents. Undertakes the regular analysis and interpretation of traffic and utilization of services on network connections. Observes systems for network alerts and events so quick response can be provided and issues can be proactively addressed. Analyzes alternative hardware, platforms and technologies for the network infrastructure. Education and Experience Bachelor's degree in Information Technology, related field, or equivalent 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. Experience designing and documenting LAN architectures for large or complex environments, including standards, diagrams, refresh plans, resiliency models, implementation roadmaps, and lifecycle strategies required. Hands-on experience with 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. Demonstrated technical leadership, including mentoring, escalation support, standards development, peer review, stakeholder communication, and influence across cross-functional teams required. Strong written and verbal communication skills with the ability to explain technical risks, options, constraints, and recommendations to technical and non-technical audiences required. Preferred: Strong working knowledge of Layer 3 integration for LAN environments, including subnetting, gateways, DHCP relay, routed uplinks, routing handoffs, firewall and wireless connectivity, and escalation boundaries. Preferred: experience with regulated, refinery, industrial, or other uptime-sensitive environments; LAN cybersecurity controls such as 802.1X, NAC, secure management, port security, configuration compliance, and vulnerability remediation. Preferred: experience with network monitoring, configuration backup, log review, packet analysis, cable certification, OTDR interpretation, automation or scripting, and recurring-issue trend analysis. Preferred: CCNP, CCNA, BICSI, FOA, CompTIA Network+, Security+, or equivalent network, cabling, fiber, or cybersecurity certification. Skills Authentic Communicator - Expresses ideas and information, both verbally and in writing, clearly and credibly. Listens to understand and fosters constructive dialogue. Cost Optimization - The process to analyze, plan and manage costs for cost efficiency and expense reduction, while maximizing business value. Internet of Things (IoT) - Familiarity with IoT concepts and protocols, as well as experience designing architectures that incorporate IoT devices and enable seamless connectivity and data exchange. IT Service Management (ITSM) - IT Service Management (ITSM) refers to the set of processes, policies, and procedures that an organization implements for designing, delivering, managing, and improving IT services it provides to its customers or internal users. ITSM aims to align the delivery of IT services with the needs of the business and ensure that IT services are delivered efficiently, effectively, and in a way that adds value to the organization. Network Administration - Organizing, installing, and supporting the organization's computer systems, including local area networks LANs), wide area networks (WANs), network segments, intranets, and other data communication systems. Network Automation - Automating the configuration and management of network resources in LAN and WAN environments. This ensures consistency and scalability of the network. Network Design - Provided network design, bandwidth allocation, IP address allocation, supervising installation, configuration and maintenance on major network technologies. Network Engineering - The process of orchestrating network traffic and data flow across the enterprise ecosystem. Network Installations - Configure network hardware and software components according to organizational guidelines and technical requirements. This includes the implementation and configuration of multiple servers, network devices and network management tools as well as the management of user network access to ensure stable and reliable network operations. Network Management System - The use of network monitoring to determine, in real time, whether a network is running optimally, to optimize and improve the average percentage of time during which the network is performing its intended function. Network Security Management - The process of providing complete visibility into the network and generating data for assets (asset groupings and classifications), firewalls, applications, ports, protocols, VPNs, NAT, and security policies and vendor devices. Network Standards - Sets and establishes rules that determine how data is transmitted between different devices in the same network. Requirements Management - The process of documenting, analyzing, tracing, prioritizing and agreeing on requirements and then controlling change while also communicating to relevant stakeholders. Results Driven - Drives operational and process excellence and innovative behavior by empowering others, collaborating, taking appropriate risk, making timely decisions and holding people accountable for results. Strategic Outlook - Examines issues, generates ideas, creates future scenarios and develops plans with a long-term perspective. Ensures short-term goals support long-term strategy and that organizational/functional strategy aligns with and supports MPC's overall business strategy. Troubleshooting - The act or process of discovering and resolving problems, disputes, or mechanical issues through a systematic, usually iterative, approach. MINIMUM 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. Location: Texas City, Texas Additional locations: Job Requisition ID: 00023278 Location Address: 502 10th St S Education: Bachelors: Information Technology Employee Group: Full time Employee Subgroup: Regular Marathon Petroleum Company LP is an Equal Opportunity Employer and gives consideration for employment to qualified applicants without discrimination on the basis of race, color, religion, creed, sex, gender (including pregnancy, childbirth, breastfeeding or related medical conditions), sexual orientation, gender identity, gender expression, reproductive health decision-making, age, mental or physical disability, medical condition or AIDS/HIV status, ancestry, national origin, genetic information, military, veteran status, marital status, citizenship or any other status protected by applicable federal, state, or local laws. If you would like more information about your EEO rights as an applicant, click here ( . If you need a reasonable accommodation for any part of the application process at Marathon Petroleum LP, please contact our Human Resources Department at View email address on click.appcast.io . Please specify the reasonable accommodation you are requesting, along with the job posting number in which you may be interested. A Human Resources representative will review your request and contact you to discuss a reasonable accommodation. Marathon Petroleum offers a total rewards program which includes, but is not limited to, access to health, vision, and dental insurance, paid time off, 401k matching program, paid parental leave, and educational reimbursement. Detailed benefit information is available at .The hired candidate will also be eligible for a discretionary company-sponsored annual bonus program. Equal Opportunity Employer: Veteran / Disability We will consider all qualified Applicants for employment, including those with arrest or conviction records, in a manner consistent with the requirements of applicable state and local laws. In reviewing criminal history in connection with a conditional offer of employment, Marathon will consider the key responsibilities of the role. About Marathon Petroleum Corporation Marathon Petroleum Corporation (MPC) is a leading, integrated, downstream energy company headquartered in Findlay, Ohio. The company operates the nation's largest refining system. MPC's marketing system includes branded locations across the United States, including Marathon brand retail outlets. MPC also owns the general partner and majority limited partner interest in MPLX LP, a midstream company that owns and operates gathering, processing, and fractionation assets, as well as crude oil and light product transportation and logistics infrastructure. Marathon Petroleum Corporation