Senior Network Engineer in Washington, DC (Public Trust Tier 2)

Specific requirements:
Implement and maintain network security controls aligned with NIST SP 800-53, including access control (AC), configuration management (CM), system and communications protection (SC), and audit and accountability (AU) control families.
Engineer and enforce Zero Trust network architecture principles in accordance with NIST SP 800-207, including network segmentation, micro-segmentation, and continuous verification of users and devices.
Design and implement least-privilege network access controls, ensuring role-based and identity-aware access across all network layers.
Deploy and manage 802.1X port-based network access control to prevent unauthorized device connectivity and enforce authentication at the network edge.
Configure and maintain centralized logging and audit capabilities for all network devices, ensuring logs are forwarded to enterprise SIEM platforms and retained in accordance with compliance requirements.
Conduct continuous monitoring and vulnerability assessments of network infrastructure, identifying risks and coordinating remediation in alignment with NIST Risk Management Framework (RMF) practices.
Harden all network devices using secure configuration baselines (e.g., Cisco Secure Configuration Guides), including disabling unnecessary services, enforcing strong encryption protocols, and securing management interfaces.
Secure public-facing and perimeter network assets by implementing strict ingress/egress filtering, firewall rule optimization, and multi-factor authentication for administrative access.
Support incident response activities by providing network-level analysis, containment actions (e.g., segmentation, blocking malicious traffic), and forensic data collection.
Establish and maintain secure network segmentation strategies to limit lateral movement and protect high-value assets and sensitive environments.
Ensure all network changes follow formal change control processes with security impact analysis, supporting compliance with NIST configuration management requirements.
Lead or participate in security assessments, audits, and compliance reviews, providing evidence, documentation, and remediation support as required.
Continuously evaluate and enhance network security posture through adoption of emerging best practices, threat intelligence, and Cisco security innovations.
Develop, implement, and maintain Network Standard Operating Procedures (SOPs); review and update all SOPs on at least an annual basis or as required to reflect changes in technology, policy, or security requirements.
Document and maintain detailed hardware and configuration baselines for all network devices, including Cisco switches, routers, firewalls, and related infrastructure; conduct annual reviews and updates.
Perform root cause analysis (RCA) for network incidents, including performance degradation, outages, and security events; document findings and implement corrective and preventive actions.
Establish, implement, and maintain automated network patch management and firmware update procedures in accordance with Cisco best practices and organizational security policies.
Develop, maintain, and update comprehensive network diagrams that accurately reflect the CBO enterprise network architecture, including cloud, production, and secure environments; review and update diagrams annually or as changes occur.
Administer and troubleshoot enterprise DNS services, including configuration changes, issue resolution, and performance optimization.
Support continuous, real-time monitoring of network infrastructure (24/7 operations), including integration with network management and security monitoring tools.
Maintain accurate and up-to-date documentation of network configurations, assets, and operational procedures to support audit readiness and operational continuity.