Roles & Responsibilities Design, implement, and maintain Layer 2/Layer 3 network infrastructure Configure and support Cisco Catalyst (9300/9500 series) and Cisco NX- OS–based switching platforms Manage VLANs, trunking, segmentation, ACLs, firewall rules, and traffic segmentation Maintain network topology, routing logic, and traffic flow design Support evaluation and future deployment of data center–optimized switching platforms for modernization initiatives Deploy and support 802.1X authentication using Cisco ISE and LDAP Integration Implement machine authentication with user fallback, dynamic VLAN assignment, and fail-open design Manage TACACS+ for network device administration Support networking for VMware ESXi / vCenter environments, including vSwitch and distributed switch configuration Provision and maintain VM networking Troubleshoot multi-tier service flows across infrastructure layers Implement and maintain STIG-compliant network configurations Enforce port security, DHCP snooping, Dynamic ARP Inspection, and secure management access Support RMF security controls and FIPS-compliance Integrate network devices with SIEM (Elastic), Zabbix, or equivalent monitoring tools Troubleshoot network connectivity, authentication failures, and application reachability issues Perform structured troubleshooting using logs, packet capture, and service validation Support change control (CAB) processes Execute network upgrades (e.g., Cisco IOS-XE / NX-OS) with validation and rollback planning Maintain documentation including VLAN mappings, IP plans, and network diagrams Support network components of backup and disaster recovery operations Validate connectivity for backup systems and storage platforms Assist in failover and restoration procedures Work with systems engineers, security teams, and application owners Provide network impact analysis for system architecture decisions Required Qualifications: An active TS/SCI security clearance. Tulzi Technologies, LLC (Tulzi) prides itself on an open, and honest culture in the workplace which builds morale conducive to inspiring growth on our team, while balancing lifestyle by supporting personal and family goals with flexibility.