Senior Network Engineer (GS261275656PL)

Gtscts; Fairmont (MN); Hybrid; USD 110,000 - 140,000; Full time

Benefits offered by this job

Health & Dental

Life Insurance

Short-term Disability

401(k)

Job summary

GTSC seeks an experienced Senior Network Engineer to design, implement, secure, and support enterprise network infrastructure. This role requires deep technical expertise and leadership to drive network initiatives from planning through execution.

The ideal candidate will have hands-on SonicWall firewall and Cisco switch experience in complex production environments, with a strong focus on security, performance, and reliability.

Qualifications

• Bachelor's degree in computer science or related field.
• 7+ years hands-on network engineering in enterprise environments.
• Experience with SonicWall firewalls and Cisco switches.
• Knowledge of TCP/IP, DNS, DHCP, VLANs, and VPNs.

Responsibilities

• Design, implement, and maintain reliable, secure network infrastructure.
• Configure and troubleshoot SonicWall firewalls, VPNs, policies, and threat management.
• Install, configure, and support Cisco switches including VLANs and QoS.
• Monitor performance, availability, and security; lead upgrades and migrations.
• Mentor junior engineers and create network documentation and SOPs.
• Collaborate with other teams to align network with business needs.

Skills

SonicWall

Cisco switches

TCP/IP

DNS/DHCP

VLANs

OSPF/BGP

Network monitoring

Troubleshooting

Communication skills

Education

Bachelor's degree in computer science or related field

Job description

Fairmont, United States | Posted on 03/26/2026

GTSC seeks an experienced Senior Network Engineer to design, implement, secure, and support enterprise network infrastructure. This role requires deep technical expertise, strong troubleshooting skills, and the ability to lead network initiatives from planning through execution. The ideal candidate will have hands-on experience with SonicWall firewalls and Cisco switches in complex, production environments.

This position has been approved for a hybrid work schedule but will work onsite at our Fairmont, WV office.

Primary Duties:

• Design, implement, and maintain reliable, secure, and scalable network infrastructure
  
• Configure, manage, and troubleshoot SonicWall firewalls, including VPNs, security policies, and threat management
  
• Install, configure, and support Cisco switches, including VLANs, routing, QoS, and switch stacking
  
• Monitor network performance, availability, and security, proactively addressing issues
  
• Lead network upgrades, migrations, and infrastructure improvement projects
  
• Troubleshoot complex network issues across LAN, WAN, WLAN, and VPN environments
  
• Collaborate with systems, security, and application teams to ensure network alignment with business needs
  
• Create and maintain network documentation, diagrams, and standard operating procedures
  
• Mentor junior engineers and provide technical leadership
  
• Ensure compliance with security standards and best practices
  
• Participate in on-call rotation and provide after-hours support as needed
  

Required Education/Experience/Skills:

• Bachelor's degree in computer science or related field of study
  
• 7 or more years of hands-on network engineering experience in enterprise environments
  
• Proven experience with SonicWall firewalls (configuration, management, and troubleshooting)
  
• Strong experience with Cisco switches (Catalyst, Nexus, or similar)
  
• In-depth knowledge of TCP/IP, DNS, DHCP, VLANs, routing protocols (OSPF, BGP preferred), and VPN technologies
  
• Experience with network monitoring and diagnostic tools
  
• Strong analytical, problem-solving, and communication skills
  

Applicants selected will be subject to a government background investigation and may need to meet eligibility requirements.

BENEFITS - Full-time Employees

• Health and Dental Insurance
  
• Group Life insurance
  
• Short-term Disability
  
• 401(k)
  

GTSC is an Equal Opportunity Employer and does not discriminate on the basis of race or ethnicity, religion, sex, national origin, age, veteran disability or genetic information or any other reason prohibited by law in employment.

GTSC is committed to working with and providing reasonable accommodation to applicants with physical and mental disabilities.

GTSC participates in the E-Verify program in all locations as required by law. Learn more about the E-Verify program.

GTSC-Talent Solutions is an Equal Opportunity Employer and does not discriminate on the basis of race or ethnicity, religion, sex, national origin, age, veteran disability or genetic information or any other reason prohibited by law in employment.