Senior Network Engineer with Security Clearance

Senior Network Engineer
Position Overview We are seeking a Senior Network Engineer to design, implement, optimize, and sustain highly available enterprise and data center network environments. This position requires deep experience with Cisco technologies, enterprise routing and switching, network security, monitoring, and complex troubleshooting. The engineer will provide senior technical leadership while supporting network modernization, data center infrastructure, operational availability, and secure connectivity.

Key Responsibilities
Design, implement, and maintain scalable and resilient enterprise and data center networks. Support spine-leaf architectures, network fabrics, and virtualized environments. Plan and integrate LAN/WAN infrastructure across on-premises, cloud, and external network environments. Configure, optimize, and troubleshoot Cisco ACI, routers, switches, firewalls, and load-balancing technologies. Support connectivity across servers, storage, hypervisors, and data center interconnects. Monitor availability and performance with platforms such as ServiceNow, SolarWinds, NetBox, and PRTG.

Lead troubleshooting and root cause analysis for complex network incidents. Develop network resiliency, contingency, and continuity procedures. Support structured cabling, patching, hardware configuration, network documentation, and data center operations. Analyze segmentation, latency, bandwidth, performance, and capacity requirements. Implement and maintain network security controls, including firewalls, ACLs, VPNs, and secure remote access. Work with infrastructure, systems, cybersecurity, and application engineering teams.

Support incident, change, escalation, and service management processes. Produce technical documentation, operational metrics, status reports, and engineering recommendations. Support network modernization and data center consolidation initiatives. Evaluate emerging network technologies and recommend improvements. Provide technical guidance and mentoring to other engineers. Participate in after-hours or on-call support when required for critical incidents. Required Qualifications
Bachelor's degree with 8+ years of relevant experience.

Additional professional experience may be considered in place of a degree. Experience designing and managing secure, scalable, and redundant data center networks. Strong hands-on experience with:
Cisco ACI
Cisco Nexus
Cisco Catalyst Strong understanding of:
TCP/IP
DNS
DHCP
OSPF
BGP
VLANs
HSRP
SNMP
Multicast
Experience using ServiceNow, SolarWinds, NetBox, or comparable monitoring and ITSM platforms. Strong knowledge of network security, including firewalls, ACLs, VPNs, and secure access methods. Experience with network asset lifecycle management and capacity planning.

Experience providing technical leadership in complex operational environments. Strong written and verbal communication skills. Must meet DoD 8140/8570 IAT Level II certification requirements, such as Security+ CE, GSEC, SSCP, or another qualifying credential, along with applicable Computing Environment certification requirements. TS/SCI with CI Poly, or TS/SCI with willingness to obtain a polygraph.

Preferred Qualifications
Active CCNA certification.
CCNP or CCIE certification.
Work Environment
100% onsite position in Bethesda, Maryland.