Sr. Engineer - Core Network

Lumos Fiber is seeking a Sr. Engineer, Core Network to help design, build, and optimize the core network infrastructure that powers our rapidly expanding fiber footprint. In this role, you will be responsible for enhancing the reliability, scalability, and security of our IP routing environment while evaluating and implementing new technologies that support network growth and performance.

This is an exciting opportunity for a network engineering professional who enjoys solving complex technical challenges and influencing the future of a modern service provider network. The ideal candidate brings deep expertise in IP networking, a passion for continuous improvement, and thrives in a fast-paced, high-growth environment where innovation and collaboration are highly valued.

Company Summary

Lumos is on a mission to deliver lightning-fast, 100% Fiber Optic internet to the communities that need it most. After the merger of Lumos Networks and North State in 2022, we quickly rose to become a leading fiber internet provider. And as of April 1, 2025, we’ve joined forces with T-Mobile to launch T-Fiber—a joint venture that blends Lumos’ infrastructure expertise with T-Mobile’s national reach to bring fiber to more homes than ever before.

We currently connect over 475,000 homes, businesses, and multi-family buildings across nine states in the East and Midwest. With major growth in markets like Ohio, Alabama, Florida, and Georgia—and a shared goal of reaching 12 to 15 million homes by 2030—Lumos is playing a vital role in closing the digital divide.

Our Mission and Values

At Lumos, we are driven by our commitment to a brighter tomorrow. We take pride in being the first to deliver 100% Fiber Optic Internet for families, small businesses, and communities. We know the possibilities of tomorrow can’t be built on the infrastructure of yesterday. And when we deliver uninterrupted Internet and limitless capacity, we create new opportunities for everyone.

We believe that the past is over, and the future is fast. That’s why we are who we are: the disruptors of the status quo. Guided by our purpose and startup mindset, we step up, move first, and adapt as we go. Here, there’s no hierarchy, only hustle.

We are all servant leaders, confident in our purpose and humble enough to pay close attention to the details. We all have the power to help solve problems and find solutions for our customers and teammates - and we do - by putting people first and doing whatever it takes to build loyalty with our customers and within our team.

We’re passionate about our customers’ experience. Their futures don’t stand still, and neither do ours. We’ll never stop reinventing ourselves to meet our customers’ evolving needs - because we know that our work, delivering 100% fiber optic internet, truly changes people’s lives.

Essential Functions

Network Architecture & Engineering

• Design, implement, and support core IP routing infrastructure and related network services.
• Evaluate, lab test, and validate new technologies, platforms, and service offerings to support network growth and performance objectives.
• Design and implement network security enhancements and infrastructure hardening initiatives.
• Develop technical requirements and engineering standards for commercial products and network services.
• Create and maintain best practices, design standards, and documentation for current and future network architectures.
• Identify opportunities to improve network reliability, scalability, and operational efficiency.

Network Operations & Technical Leadership

• Provide Tier IV support for complex network and customer-impacting issues, serving as a technical escalation point across the organization.
• Partner with Network Operations, Field Operations, Product, Sales Engineering, and Customer Support teams to troubleshoot and resolve service issues.
• Analyze recurring network issues and develop long-term solutions that improve network stability and customer experience.
• Research, test, and implement operating system upgrades, patches, and infrastructure improvements.
• Support strategic initiatives related to IPv6 deployment, routing optimization, network automation, and service innovation.
• Participate in industry events, vendor demonstrations, and technical training to remain current on emerging technologies and industry trends.

Knowledge, Skills, and Abilities Required

• CCNP (Cisco Certified Network Professional) certification or equivalent hands-on experience supporting enterprise or service provider networks.
• Strong expertise in IP routing, carrier-grade networking, and ISP network operations.
• Experience designing, implementing, and supporting IPv6 network environments.
• Experience with virtualization technologies and virtualized network infrastructure.
• Strong working knowledge of Linux operating systems and administration.
• Experience working with MySQL and PostgreSQL database structures and environments.
• Deep understanding of routing protocols, network architecture, security principles, and network performance optimization.
• Strong written and verbal communication skills with the ability to explain technical concepts to both technical and non-technical audiences.

Other Experience & Requirements

• 7+ years of experience in network engineering, core network operations, or related telecommunications engineering roles.
• Bachelor’s degree in Engineering, Computer Science, Information Technology, or a related field preferred; equivalent experience will be considered.
• Experience supporting Internet Service Provider (ISP) or telecommunications networks strongly preferred.
• Experience with Nokia networking platforms and configurations preferred.
• Experience working with ARIN and internet resource management preferred.
• Demonstrated success designing and supporting scalable network infrastructure in high-growth environments.

Physical Requirements

• Frequently operates a computer, keyboard, and other standard office equipment.
• Near-constant use of sight, speech, hearing, comprehension, and reasoning.
• Primarily remote work with occasional travel to a Lumos office or offsite meetings as needed.
• Must be able to sit or remain in a stationary position for extended periods.