Senior Network Administrator

Job Description

Job Title: Senior Network Administrator

Location: San Marcos, TX - Onsite Work

Duration: 6 Months

Job Summary

The Senior Network Administrator with Engineering and Architecture responsibilities will design, engineer, secure, and maintain the organization’s enterprise network infrastructure. This role blends high-level architectural planning with hands-on engineering and operational support. The ideal candidate brings deep experience supporting complex enterprise networks with strong security, scalability, and availability requirements.

Work Authorization: U.S. /Green Card ONLY due to legal or government contract requirement.

Key Responsibilities

Network Architecture & Design

• Architect scalable and secure network solutions for enterprise LAN, WAN, WLAN, and data center environments.
• Design network topologies for multi-site organizations, distributed offices, data centers, and high-density wireless environments.
• Implement routing architectures (BGP, OSPF, EIGRP) and advanced switching technologies (VLANs, STP, VXLAN, QoS).
• Develop Zero Trust and micro-segmentation strategies for diverse enterprise user populations.
• Evaluate and recommend new networking technologies aligned with business and operational goals.

Network Engineering & Implementation

• Deploy and configure enterprise routers, switches, firewalls, and wireless infrastructure across offices, data centers, and operational facilities.
• Engineer hybrid cloud connectivity (AWS, Azure, GCP) and support cloud-based applications and services.
• Implement SD-WAN and modern enterprise network architectures.
• Use automation tools (Python, Ansible) for configuration management and operational efficiency.
• Lead major network upgrades, migrations, and large-scale wireless deployments.

Operations & Administration

• Oversee network availability and performance across all organizational locations and facilities.
• Provide Tier-3 support for complex network issues impacting critical business operations.
• Manage DNS, DHCP, RADIUS, NTP, and IPAM systems.
• Maintain accurate network documentation, diagrams, and ITIL-based change records.

Security & Compliance

• Manage firewall policies, NAC, IDS/IPS, and secure remote access solutions.
• Support compliance with applicable regulatory requirements and cybersecurity frameworks such as NIST and CIS benchmarks.
• Partner with cybersecurity and IT governance teams to protect sensitive organizational data.
• Lead network security architecture initiatives across the enterprise.

Collaboration & Leadership

• Collaborate with infrastructure, security, application, facilities, and IT leadership teams.
• Provide technical guidance and mentorship to junior network staff.
• Act as a subject-matter expert on network architecture and strategy for enterprise stakeholders.

Required Skills & Qualifications

• 7–10+ years of experience in network engineering, architecture, or administration.
• Experience supporting large-scale, multi-site enterprise networks.
• Strong expertise with networking platforms such as Cisco, Juniper, Palo Alto, Fortinet, or Aruba.
• Deep knowledge of TCP/IP, routing, switching, VPNs, and network security fundamentals.
• Experience designing high-availability enterprise networks.
• Experience with cloud networking (AWS, Azure, GCP) and hybrid architectures.
• Proficiency with monitoring and diagnostic tools (SolarWinds, PRTG, Wireshark, NetFlow).
• Experience with automation and scripting (Python, Ansible, PowerShell).

Qualifications

• Bachelor’s degree in information technology, Computer Science, Engineering, or a related field.

Advanced certifications such as:

• CCNP / CCIE
• JNCIP / JNCIE
• PCNSE, Fortinet NSE
• AWS or Azure Networking Specialty
• Experience with VoIP, SD-WAN, wireless controllers (Aruba/Cisco), and EVPN/VXLAN architectures.

Key Competencies

• Strong understanding of enterprise-scale networking and operational requirements. Excellent communication skills for working with technical and non-technical stakeholders.
• Ability to manage competing priorities and support mission-critical services.
• Strategic thinking, leadership, and strong documentation practices.