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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Network Engineer - Core/Peering - **Company:** Gateway Fiber - **Location:** O'Fallon, MO, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Build Automation, Border Gateway Protocol, Wavelength-Division Multiplexing, Software Design Patterns, Ethernet, IPv4, IPv6, Multi-protocol Systems, Junos, Python (Programming Language), Network Layer, Multicasting, Routing, Packet Analyzer, Open Shortest Path First (OSPF), Peering, Software Tools, Ansible, Network Routers, Scripting, XGS-PON, Juniper, Open Network Automation Platform, Cisco - **Published:** September 10, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=f1d1934c48880a72 ## About the Role * A seasoned network engineer who has spent years inside a service provider core and is comfortable owning routing decisions that affect thousands of subscribers. * You're passionate about network scale, security, and stability using software tools, automation-first design patterns, and common automation frameworks. * A self-motivated problem solver who can identify issues, troubleshoot thoughtfully, and follow through to resolution. * Comfortable working in a fast-moving environment where ownership, judgment, and teamwork matter. * A teammate who jumps in to help, shares knowledge, and looks for practical ways to improve how the network is built and run., * 8+ years of hands-on experience in carrier-grade Layer 3 core routing, architecture, design, and implementation inside an ISP or comparable service provider network. * Deep production expertise with BGP, including eBGP and iBGP, route reflection, communities, and routing policy, along with peering and transit management. * Juniper JUNOS and MX Series core routers preferred; equivalent Cisco or other carrier-class core platform experience will be considered. * Demonstrated experience in network automation and scripting with Python, Ansible, or similar tooling. * IS-IS and OSPFv3 at scale, plus multicast and common WAN protocols. * IPv4 and IPv6 numbering, aggregation, and allocation, including dual-stack deployment experience. * Experience in Enterprise and Carrier Ethernet switching in both metro and long-haul networks. * Calix GPON, XGS-PON, and AXOS access platforms are a plus. * Layer 1 transport, DWDM, CWDM, and optical transceivers are a plus. * Working knowledge of both Unix/Linux and Windows. * The ability to read packet captures and resolve subtle routing and forwarding problems while the network is under pressure. * Exceptional attention to detail, sound change discipline, and advanced problem-resolution skills. * Excellent communication and interpersonal skills, with genuine enthusiasm for the internet, its growth, and the technologies behind it. * JNCIP or JNCIE, CCNP or CCIE Service Provider, or a comparable certification is a plus. ## Description * Design, deploy, and maintain Gateway's Layer 3 core, aggregation, and peering network as we add 100,000 residential and business passings each year. * Develop and maintain routing architectures and policies across BGP, IS-IS, OSPFv3, and MPLS domains. * Plan and execute capacity, peering, and transit changes, and forecast where the network needs to grow before growth becomes a problem. * Act as the senior escalation point for complex core routing, MPLS, and transport issues, working them through to root cause and permanent fix. * Build automation, monitoring, and tooling that lets a small team operate a large network reliably. * Write and maintain standards, methods of procedure, and documentation that keep changes safe, repeatable, and easy to hand off. * Serve as an internal resource to other departments on issue resolution, customer communication, and general network education. * Mentor engineers and operations staff, sharing what you know and raising the technical bar across the team. ## Related Videos - [How Cisco embraced a DevOps culture within its network engineering team](https://www.wearedevelopers.com/videos/99-how-cisco-embraced-a-devops-culture-within-its-network-engineering-team) - [Demystifying application networking in the cloud](https://www.wearedevelopers.com/videos/675-demystifying-application-networking-in-the-cloud) - [IoT: The road to sustainability](https://www.wearedevelopers.com/videos/557-iot-the-road-to-sustainability) - [IP Authentication: A Tale of Performance Pitfalls and Challenges in Prod](https://www.wearedevelopers.com/videos/1413-ip-authentication-a-tale-of-performance-pitfalls-and-challenges-in-prod) - [Your Infrastructure Is Not a Playground: AI Agents for Infra Done Right](https://www.wearedevelopers.com/videos/2084-your-infrastructure-is-not-a-playground-ai-agents-for-infra-done-right) - [Computer Vision from the Edge to the Cloud done easy](https://www.wearedevelopers.com/videos/263-computer-vision-from-the-edge-to-the-cloud-done-easy) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Everything a Developer Needs to Know About MCP with Neo4j](https://www.wearedevelopers.com/magazine/604-everything-a-developer-needs-to-know-about-mcp-with-neo4j) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Where to Find Entry-Level Software Engineering Jobs](https://www.wearedevelopers.com/magazine/397-where-to-find-entry-level-software-engineering-jobs) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [5 Reasons Why Attending Conferences in 2026 Matters More Than You Think](https://www.wearedevelopers.com/magazine/692-5-reasons-why-attending-conferences-in-2026-matters-more-than-you-think)