Senior Network Security Engineer

GTN Technical Staffing; Dallas (TX); On-site; USD 150,000 - 230,000; Full time

Job summary

GTN Technical Staffing seeks a Senior Network Security Engineer to lead design, implementation, and optimization of a hyperscale network security environment across on-prem and cloud. You will drive security architecture, incident response, and automation initiatives within a high-availability HPC infrastructure.

You will partner with network engineering, platform, and DevOps teams to embed security across the stack, mentor engineers, and manage security operations and risk programs.

Qualifications

• 8+ years of experience in network engineering and network security with architectural responsibilities.
• Experience designing secured trusted, untrusted, and DMZ environments.
• Expertise in TCP/IP, routing, switching, load balancing, and OSI model fundamentals.
• Hands-on with firewalls, VPNs, proxies, IPsec, MACsec, TLS/HTTPS, DNS, NTP, AAA.
• Experience with security vendors and cloud (AWS/Azure).
• Experience implementing Zero Trust and segmentation strategies.

Responsibilities

• Design and implement scalable network security architectures across on-prem and cloud environments.
• Lead segmentation strategies, Zero Trust initiatives, and secure network design for HPC and distributed systems.
• Manage and optimize firewalls, proxies, VPNs, and advanced threat protection platforms.
• Serve as a senior escalation point for complex security incidents and network threats; mentor engineers.
• Develop and implement automation for security infrastructure provisioning and lifecycle management; IaC with Python, Terraform, Ansible.
• Drive governance, risk management, and security policies across infrastructure and applications.

Skills

TCP/IP fundamentals & OSI

Network security design

Zero Trust architecture

Python scripting

Terraform

Ansible

Cloud security AWS/Azure

Firewall/VPN/Proxies

DMZ design

Automation & IaC

Tools

Palo Alto Networks

Fortinet

Check Point

F5 BIG-IP

Job description

• Base salary: $150,000 – $230,000 + performance bonus

Overview

This organization operates at the forefront of high-performance computing (HPC) and cloud infrastructure, building and scaling mission-critical platforms that support advanced research, AI/ML workloads, and large-scale data processing. Backed by strong leadership and investment, the company is focused on delivering next-generation infrastructure that accelerates innovation and eliminates friction across compute and data environments.

We are seeking a Senior Network Security Engineer to lead the design, implementation, and optimization of a hyperscale network security environment. This role combines deep technical expertise with leadership responsibilities, driving security architecture, incident response, and automation initiatives across a complex, high-availability infrastructure.

You will play a key role in securing distributed HPC and cloud environments, partnering closely with network engineering, platform, and DevOps teams to embed security into every layer of the stack.

Key Responsibilities

Security Architecture & Engineering

• Design and implement scalable network security architectures across on-prem and cloud environments
• Lead segmentation strategies, Zero Trust initiatives, and secure network design for HPC and distributed systems
• Manage and optimize firewalls, proxies, VPNs, and advanced threat protection platforms

Technical Leadership & Escalation

• Serve as a senior escalation point for complex security incidents and network threats
• Mentor junior and mid-level engineers, providing guidance on troubleshooting and architecture decisions
• Lead root cause analysis and drive corrective and preventative actions

Automation & Infrastructure as Code

• Develop and implement automation for security infrastructure provisioning and lifecycle management
• Build playbooks and frameworks using Python, Terraform, Ansible, and vendor APIs
• Drive adoption of automation tools such as AlgoSec, Tufin, Jenkins, and Git-based workflows

Security Operations & Risk Management

• Oversee vulnerability assessments, penetration testing coordination, and remediation efforts
• Develop and maintain security policies, threat models, and governance frameworks
• Partner with cross-functional teams to embed security best practices across infrastructure and application layers

Required Experience

• 8+ years of experience in network engineering and network security, including architectural responsibilities
• Proven experience designing and securing trusted, untrusted, and DMZ environments
• Strong expertise in TCP/IP, routing, switching, load balancing, and OSI model fundamentals
• Deep knowledge of network security technologies, including firewalls, VPNs, proxies, IPsec, MACsec, TLS/HTTPS, DNS, NTP, and AAA
• Hands-on experience with leading security vendors such as Palo Alto, Fortinet, Check Point, and F5
• Experience implementing Zero Trust architectures and segmentation strategies
• Strong scripting/automation experience with Python, Terraform, or Ansible
• Experience securing cloud environments (AWS and/or Azure)

Preferred Experience

• Experience with EVPN/VXLAN-based data center architectures
• Background supporting hybrid or multi-cloud environments at scale
• Exposure to M&A integrations and network/security consolidation efforts
• Experience building or working with SOC environments or MSSPs
• Firewall policy automation and orchestration experience
• Relevant certifications such as CISSP, CCIE Security, GIAC (GSEC, GCIH, GXPN), or vendor-specific certifications