Senior Network Engineer (GS261275656PL)

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

Identity Statement

As part of the application process, you are expected to be on camera during interviews and assessments. We reserve the right to take your picture to verify your identity and prevent fraud.

Work Definitions: If this position is listed as remote or hybrid, you'll periodically work from a company or client site facility.

As part of the onboarding process for this position, individuals undergoing identity verification for new PIV card issuance, must present a REAL ID compliant form of identification or an equivalent acceptable form.

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.