Senior Network Engineer, VoIP

Marathon Petroleum; San Antonio (TX); On-site; USD 120,000 - 190,000; Full time

Job summary

Marathon Petroleum in the United States seeks a senior networking and collaboration architect to design, implement, and optimize our Cisco-based voice and collaboration environment. You will partner with Network Engineering, Cybersecurity, Infrastructure, Cloud, and business stakeholders to deliver reliable, scalable, and secure communication services across the enterprise.

The role requires hands-on leadership, architectural guidance, and mentoring of engineers, with a focus on modernization,

Qualifications

• Bachelor's degree in IT or related field.
• Five+ years of relevant VoIP/UC experience.
• CCVP or equivalent certification preferred.
• Experience leading site surveys, capacity planning, and deployment of VoIP hardware/software.
• Experience migrating legacy TDM/PBX to modern VoIP architectures.

Responsibilities

• Design, implement, and optimize enterprise voice and collaboration environments (CUCM, UCCX, Unity).
• Lead architectural reviews, evaluations, and modernization initiatives.
• Mentor engineers and drive standardized technical documentation and playbooks.
• Collaborate with Network Eng., Cybersecurity, Infra, Cloud, and OT to ensure secure, reliable services.
• Provide escalation support and performance tuning for VoIP networks.

Skills

CUCM

UCCX

VoIP

SIP

Unified Communications

Architecture leadership

Networking

Scripting

Education

Bachelor's in Information Technology

CCVP or equivalent

Tools

Wireshark

SIP Debugging

Job description

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

The ideal candidate will possess extensive experience in Cisco Collaboration and Unified technologies and serve as a senior technical leader within the Connectivity organization. This individual will be responsible for the design, implementation, optimization, support, and strategic evolution of the enterprise voice and collaboration environment, including Cisco Unified Communications Manager (CUCM), Cisco Unified Contact Center Express (UCCX), Cisco Unity Connection, SIP-based communications platforms, and related third‑party technologies.

This position requires a highly collaborative professional who can effectively partner with Network Engineering, Cybersecurity, Infrastructure, Cloud, Application Development, Operations Technology (OT), and business stakeholders to deliver reliable, scalable, and secure communication services across the enterprise. The successful candidate will serve as a trusted advisor, providing technical leadership, architectural guidance, and strategic recommendations that align communication platforms with business objectives and enterprise standards.

As a senior member of the engineering team, this individual will participate in architectural reviews, technology evaluations, modernization initiatives, and long‑term roadmap planning. Responsibilities include developing technical designs, performing assessments, driving remediation and standardization efforts, creating and maintaining technical documentation, and leading cross‑functional discussions to visualize and communicate complex concepts. The candidate must be capable of making sound technical decisions, influencing outcomes across multiple teams, and mentoring engineers through knowledge sharing and leadership.

The successful candidate will operate with minimal supervision, demonstrate initiative and ownership, maintain a customer‑focused mindset, and possess exceptional written and verbal communication skills. This role requires the ability to balance strategic thinking with hands‑on technical execution while ensuring the stability , resilience, and continuous improvement of the enterprise collaboration environment.

Key Responsibilities

• Deploy complex (VoIP) network configurations for on‑premise or cloud‑based networks and assists in the development of playbooks for network systems ( Cloud Computing ) .
• Assists in the integration of new systems and tools. Develops and maintains scripts to facilitate network administrative tasks and automate repetitive processes.
• Archi tect and engineer enterprise VoIP and Unified Communication so l utions ( e.g. Cisco Unified Communication Manager, Cisco Unified Contact Center Express (UCCX), Voice Gateway . Design complex dial plans, partitions, Calling Search Spaces (CSS), translation patterns and route patterns.
• Serve as a primary escalation point for complex voice network issues. Analyze packet captures and SIP signaling to resolve jitter, latency, and call routing failures. Analyze performance on the network for non‑VoIP‑related traffic as required . ( Troubleshooting, Results Driven, Network Management System )
• Monitors performance identifies areas for improvement for the (VoIP) 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 (VoIP) network connections.
• Engage in discussions and participate in development of Private SaaS , Edge Computing and other advanced cloud capabilities ( Cloud Computing, Network Installation and Configuration, Network Transformation ) .
• Adheres to network policies, standards, and standard operating procedures for how-to documents.
• Analyzes alternative hardware, platforms, and technologies for the network infrastructure ( Network Transformation, Network Testing, Network Traffic Analysis ) .

Education and Experience

• Bachelor's degree in Information Technology preferred , related field or equivalent experience.
• Five (5) or more years of relevant experience required .
• Cisco Certified Voice Professional ( CC V P ) or equivalent certifications preferred .
• E xperience in l ead ing site surveys, capacity planning, end user requirement analysis, and the physical/logical deployment of VoIP hardware and software preferred.
• Experience in migrating legacy TDM/PBX systems to modern VoIP architecture preferred.
• Experience with p lan ning and execut ion of major system upgrades, patches, firmware updates, and database replication health checks across the publisher and subscriber nodes preferred.
• Experience with enterprise scale data centers, network topologies