Network Engineer job at HollyFrontier in Dallas, TX

Title: Network Engineer

Location: Dallas, TX, US, 75219

Workplace: Salary Exempt

Job Description:

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
Proven experience with Azure networking, including:

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 for high availability, fault tolerance, and scalability
Solid understanding of cloud networking concepts and shared responsibility models
Familiarity with Infrastructure as Code (IaC) concepts and tools (e.g., ARM, Bicep, Terraform)
Working knowledge of automation and scripting (PowerShell, Python, or equivalent)
Experience integrating networking with identity, security, and application services
Strong analytical, troubleshooting, and problem‑solving skills
Excellent written and verbal communication skills
Ability to translate business requirements into technical solutions
Capable of leading technical discussions and influencing architecture decisions
Preferred Skills
Azure certifications (e.g., Azure Network Engineer Associate, Azure Solutions Architect)
Experience with the following technologies and platforms:

Cisco, Aruba, Arista switching and wireless platforms
Palo Alto, Fortinet, or similar next‑generation firewalls
Cloud-native security services

Experience with multi‑cloud networking (AWS or GCP exposure)
Familiarity with DevOps, CI/CD pipelines, or SRE operating models
Experience supporting regulated or industrial environments

Supervisory/Managerial Responsibility

May act as technical lead or project lead on complex initiatives
May provide task direction, mentoring, and technical guidance to other network engineers or contractors

Work Conditions

Primarily office‑based or hybrid, with travel up to 20% as required
May include work in data center, refinery, plant, warehouse, or field environments
Subject to on‑call rotation and participation in after‑hours maintenance windows
Work may include nights, weekends, and holidays during scheduled or emergency activities

Benefits

HF Sinclair offers a comprehensive benefits package designed to support the well-being of our employees and their families. Our benefits include, but are not limited to, the following:

Medical Insurance
Vision Insurance
Dental Insurance
Paid Time-Off
401(k) Retirement Plan with match
Educational Reimbursement
Parental Bonding Time
Employee Discounts

We are committed to fostering a supportive and inclusive work environment, ensuring our employees have the resources needed to thrive professionally and personally. Benefit eligibility is governed by official plan documents, for more details visit Total Rewards.

Physical Requirements

Ability to sit, stand, walk, bend, and lift equipment up to 50 lbs.
Ability to climb ladders and work in confined spaces when required
Ability to wear required personal protective equipment as applicable

Our One HF Sinclair Culture:

At HF Sinclair, we are united through our One HF Sinclair Culture, which is underpinned by our five core values of Safety, Integrity, Teamwork, Ownership and Inclusion. Developed to empower our people, our five core cultural values are at the heart of everything we do and extend to how we engage our stakeholders. These values influence our decisions, shape our behaviors and keep us connected across the entire organization. We maintain a true Safety culture for our employees, communities, environments and customers. Our goal is to make sure everyone returns home safely each day. We have a long-standing commitment to Integrity and ethical behavior and do what is right for our employees, investors, communities and the environment. We encourage employees to Step Up and Stand Out by championing a culture of Teamwork and Ownership. We foster a culture of Inclusion by encouraging diversity of experiences, viewpoints and backgrounds. What makes each of us different, together makes us stronger.

About HF Sinclair Corporation

HF Sinclair Corporation, headquartered in Dallas, Texas, is an independent energy company that produces and markets high-value light products such as gasoline, diesel fuel, jet fuel, renewable diesel and other specialty products. HF Sinclair owns and operates refineries located in Kansas, Oklahoma, New Mexico, Wyoming, Washington and Utah and markets its refined products principally in the Southwest U.S., the Rocky Mountains extending into the Pacific Northwest and in other neighboring Plains states. HF Sinclair supplies high-quality fuels to more than 1,500 branded stations and licenses the use of the Sinclair brand at more than 300 additional locations throughout the country. In addition, subsidiaries of HF Sinclair produce and market base oils and other specialized lubricants in the U.S., Canada and the Netherlands, and export products to more than 80 countries. Through its subsidiaries, HF Sinclair produces renewable diesel at two of its facilities in Wyoming and also at its facility in Artesia, New Mexico. HF Sinclair provides petroleum product and crude oil transportation, terminalling, storage and throughput services to its refineries and the petroleum industry.

Equal Opportunity Employer

HF Sinclair Corporation is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status or any other prohibited ground of discrimination.

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