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.