Network Engineer

Basic Function

HF Sinclair is seeking a Network Engineer based in Dallas, TX.  This role is a senior-level technical role responsible for the architecture, design, implementation, and operational support of enterprise network and connectivity services across on‑premises, hybrid, and cloud environments. This role serves as a subject matter expert for complex network technologies, provides technical leadership for large initiatives, and partners closely with infrastructure, security, cloud, and application teams to deliver resilient, scalable, and secure connectivity solutions that support evolving business needs. The ideal candidate combines deep traditional networking expertise with hands-on experience in Azure and cloud networking, automation, and modern network operating models. Job Duties

Design, implement, and support enterprise network architectures across data center, campus, branch, and cloud environments Architect and operate hybrid connectivity solutions, including on-prem to Azure integration (ExpressRoute, VPN, vWAN) Monitor health, performance, capacity, and availability of the enterprise network and cloud network services Lead and participate in incident response, root cause analysis, and post-incident improvement efforts Serve as senior escalation point (Tier 3) for complex production network issues Provide strategic input and technical leadership for network modernization, cloud adoption, and digital initiatives Design and support routing, switching, wireless, SD‑WAN, load balancing, and firewall solutions Implement and maintain secure network connectivity aligned with Zero Trust and defense‑in‑depth principles Partner with Cloud, Security, Server, and Application teams to enable resilient application connectivity Evaluate emerging technologies and make architecture recommendations for short‑, mid‑, and long‑term initiatives Develop standards, reference architectures, and best practices for enterprise and cloud networking Automate routine network tasks using scripting and infrastructure‑as‑code tools where appropriate Coordinate and lead work with vendors, service providers, and managed services partners Produce clear technical documentation, diagrams, and operational runbooks Mentor junior engineers and act as technical lead on projects and initiatives Participate in scheduled maintenance windows and provide on‑call support as required Perform other duties and special assignments as determined by management

Special assignments or tasks assigned to the employee by their superior, as determined from time to time in their sole and complete discretion.   Experience

Minimum of 7 years of progressive experience in enterprise networking roles Demonstrated experience designing and supporting complex, multi‑site enterprise networks Strong hands-on experience with:

Routing and switching (BGP, OSPF, EIGRP, VLANs, VRF) Network security (firewalls, VPNs, segmentation, NAC, Load Balancers) Wireless networking and controller‑based architectures SD‑WAN technologies and architectures

Virtual Networks (VNets), subnets, routing, NSGs, UDRs Azure VPN Gateway and ExpressRoute Azure Virtual WAN and hub‑and‑spoke architectures Load Balancers, Application Gateway, and private endpoints

Experience operating in hybrid environments spanning on‑premises and public cloud Working knowledge of network monitoring, performance management, and troubleshooting tools Experience participating in or leading technical projects with cross‑functional teams Education Level

Bachelor’s degree in Computer Science, Information Technology, or related field or equivalent experience Required Skills

Expert understanding of OSI model Layers 1–7 and modern network architectures Strong knowledge of TCP/IP, routing protocols, network security principles, and encryption Ability to design