SME Network Engineer

Harmonia Holdings Group•Lorton, VA

11d•Hybrid

About The Position

Harmonia Holdings Group is seeking an experienced SME Network Engineer to support DHS ICE Homeland Security Investigations (HSI) Title III and Linguists Unit (T3LU) under the CALEA program. This role provides hands-on leadership across all network engineering functions , including architecture, routing, switching, firewall engineering, VPN and PKI integration, segmentation design, troubleshooting, and IA/accreditation-grade documentation. The SME ensures the integrity, resilience, and performance of mission-critical CALEA networks and collaborates closely with Systems, Virtualization, Storage, and Field Engineering teams to ensure end-to-end operational success. This position supports DHS’s mission while contributing to Harmonia’s overarching goals: delivering premier technology services, driving mission-focused innovation, sustaining organizational excellence, and being an employer of choice for skilled professionals.

Requirements

Bachelor’s degree in IT, Engineering, or related field OR +5 years equivalent experience.
10+ years of enterprise network engineering experience with increasing responsibility.
Technical Proficiency
Deep hands-on experience with: Cisco routing/switching (3k–9k platforms)
Palo Alto or Fortinet firewalls and policy design
VPN architecture, IPsec tunneling, PKI integration
Network segmentation using VLANs, VRFs, and security zones
Packet capture and analysis
Network monitoring and telemetry tools (SolarWinds, NetFlow, Splunk, etc.)
Demonstrated ability to produce complete network diagrams and architecture documentation based solely on device configuration, logs, and analysis.
Strong understanding of cross-domain interactions (DNS, AD, VMware networking, SAN connectivity).
Excellent communication skills with both technical and non-technical stakeholders.
Proven ability to work independently in high-pressure, mission-critical environments.
Strong analytical, investigative, and documentation skills.
U.S. Citizen (required for access to DHS IT systems)
Must be able to obtain and maintain DHS/ICE Fitness Determination (Public Trust), including favorable preliminary Fitness and full NBIS eAPP investigation (SF-85P, OF-306, SSA-89, fingerprints, PREA questionnaire if required)

Nice To Haves

CCNA, CCNP Enterprise or CCNP Security
PCNSE
Fortinet NSE4/NSE5
CCIE-level competency (or equivalent expertise)
Additional certifications may be required after hire and must be obtained within designated timelines.
Experience supporting federal law enforcement IT systems or CALEA-aligned mission operations.
Hands-on participation in COOP/DR architecture or failover site execution.
Experience with VPN transitions, network segmentation, and multi-site resiliency.
Familiarity with Kubernetes/container environments (e.g., JSI platforms).
Experience supporting 24/7 high-availability operations.
Strong initiative and attention to detail.
Adaptability to evolving mission requirements and operational tempo.
Collaborative approach with technical teams, vendors, and government partners.
Alignment with Harmonia’s principles of excellence, collaboration, curiosity, and integrity.