Sr. Network Engineer

CSZNet Inc.; Washington (District of Columbia); On-site; USD 120,000 - 180,000; Full time

Job summary

CSZNet Inc. is seeking a Senior Network Engineer to lead the implementation, configuration, operation, and support of its network infrastructure in Washington, DC.

The role covers LAN/WAN, wireless, firewalls, VPNs, load-balancing, and high-availability configurations. The engineer will perform advanced troubleshooting, support 24x7 NOC operations, and collaborate with Tier 3 engineers and cross-domain teams to ensure security, resiliency, and optimal traffic flows.

Qualifications

• Senior network engineer with hands-on LAN/WAN, wireless and security controls.
• Experience with load-balancing and high-availability configurations.
• Ability to troubleshoot network incidents and perform root-cause analysis.
• Knowledge of change-management processes for network changes.
• Certifications such as CCIE, CISSP, or equivalent are preferred.

Responsibilities

• Implement, configure, operate, and support network infrastructure.
• Deploy, configure, and optimize LAN/WAN, wireless, security, and HA.
• Support 24x7 NOC operations: monitoring, incident response.
• Coordinate with Tier 3 engineering and cross-domain teams.
• Validate firewall, VPN, NAT, and segmentation configurations.
• Maintain topology diagrams and network inventory.
• Ensure SLA, latency, throughput, and uptime metrics.
• Collaborate on firewall rules and change management.
• Validate failover, resiliency, and traffic flows.
• Circuit and routing coordination.

Skills

Network infrastructure

LAN/WAN

Wireless networks

Firewalls & VPNs

Load balancing

High availability

Troubleshooting

NOC operations

Change management

Documentation

Education

CCIE / CCIE Security / CISSP / JNCIP / TOGAF

Tools

Firewall platforms

VPN technologies

Load balancers

Routing protocols

Network security controls

Job description

• Provide a Senior Network Engineer responsible for implementation, configuration, operation, and support of network infrastructure
• Execute deployment, configuration, and optimization of:
• LAN/WAN infrastructure (core, distribution, access layers)
• Wireless networks and connectivity solutions
• Firewalls, VPNs, network security controls, and segmentation technologies
• Load-balancing and application delivery platforms, including high-availability configurations, traffic management policies, and failover services
• Perform advanced troubleshooting and root cause analysis for network incidents, outages, and performance degradation
• Support 24×7 NOC operations through:
• Monitoring, alert triage, and incident response
• Escalation handling and coordination with Tier 3 engineering
• Configure, validate, and maintain routing, segmentation, firewall, VPN, and load-balancing policies aligned with architecture standards.
• Collaborate on firewall rule changes, security zone configurations, NAT policies, VPN services, and segmentation controls with DMCS in accordance with approved change management processes.
• Perform validation and testing of firewall failover, VPN resiliency, routing convergence, load-balancer high-availability configurations, and application traffic flows.
• Maintain accurate network documentation, including topology diagrams, configurations, and inventory records
• Support performance monitoring and SLA compliance, including latency, throughput, uptime, and availability metrics
• Coordinate with telecommunications, cloud, and infrastructure teams for cross-domain issue resolution
• Responsible for:
• Call quality dependency
• Circuit / routing coordination

Certifications for: CCIE, CCIE security, CISSP, JNCIP, and TOGAF (One or more)