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The Senior Network Engineer provides Tier‑3/Tier‑4 engineering expertise for design, implementation, troubleshooting, and optimization of the HSEN WAN and HQ LAN‑A infrastructure, ensuring ≥ 99.5 % availability for critical services. The role supports configuration management, change control, security patching, and incident response across routers, switches, firewalls, VPN/DMVPN/SD‑WAN, wireless, and cloud network components.    The objective of the support services for this project is to design, build, and maintain a cloud infrastructure with a focus on network security that supports the organization's technology and business needs. This involves architecting scalable, secure, and highly available cloud solutions, ensuring optimal performance and cost-efficiency in cloud environments such as AWS, Azure, and Google Cloud. The role requires close collaboration with other IT teams, stakeholders, and third-party vendors to deliver cloud-based infrastructure and services that align with organizational goals. Key Tasks and Responsibilities  Core Engineering: * Engineer and implement upgrades to WAN/LAN per approved designs; validate in lab prior to production cut‑over.  * Perform advanced routing (OSPF/BGP/DMVPN/SD‑WAN), QoS, multicast, and segmentation.  * Integrate new security controls (NGFW, IDS/IPS, ZTNA) and support ATO evidence collection.  Operations & Support: * Provide Tier‑3 escalation and Tier‑4 manufacturer liaison for Priority‑1/2 incidents.  * Execute vulnerability remediation and patch management per DHS severity windows.  * Coordinate change‑management reviews and post‑implementation validation.  Process & Documentation: * Develop and maintain device configurations, SOPs, logical/physical diagrams in CMDB/ServiceNow.  * Generate weekly service‑request metrics, monthly availability, and root‑cause reports.  *Contribute to automation scripts (Ansible/Python) and network‑modernization prototypes.  This Role Provides Task Support for:  * Operational Support  * Software Maintenance and Upgrades  * Telecommunications Maintenance (Data, Voice, Images, including Wireless) * * Infrastructure Management Services (IMS)  * Configuration Management  * Network/Hardware Support  * IT Support (Tier 3 network support)  * Resource Management  * Backup and Recovery Management  * Installation, Configuration, and Tuning  * Electronic Software Licensing Services including license: deployment, management, tracking, upgrading, etc.  * Infrastructure System Management – Firewalls, etc.  * IT Operation and Maintenance Planning  * Data Quality Management  * Transformation Services  * Continual Service Improvement  * Balanced Scorecard for Operations  * IT Infrastructure Optimization