Network Engineer III

Network Engineer IIILocation: Springfield, VAPosition OverviewWe are seeking an experienced Network Engineer III to support enterprise-scale wide area (WAN), local area (LAN), and campus area (CAN) networks operating across multiple security domains. This role focuses on network engineering, new capability implementation, and ongoing operations and sustainment of mission-critical infrastructure.Key ResponsibilitiesCoordinate system maintenance, monitoring, and installation across multiple WAN/LAN environments spanning diverse platforms and technologiesSupport research, design, and implementation of enterprise-wide network solutions to meet operational and mission objectivesTroubleshoot and resolve issues related to network media, devices, and componentsMonitor and evaluate network health and performance using hardware and management toolsDevelop and maintain a technical roadmap for network capabilities, operations, and emerging technologiesAssist in the development and execution of test plans and supporting documentation for network configuration changes prior to implementationPerform network traffic analysis and bandwidth optimization to meet performance and availability targetsEvaluate and report on new and emerging networking and communications technologiesRecommend improvements and technology upgrades aligned with performance goals, standardization, and industry best practicesEnsure compliance with all applicable network security processes, procedures, and government policiesRepresent operational and technical requirements during coordination with external organizations and stakeholdersConduct site surveys for new installations and technology refresh effortsInstall, maintain, and troubleshoot satellite communications equipmentDevelop and maintain network architecture and topology diagramsRequired QualificationsActive TS/SCI security clearance8+ years of experience in network and transport technologies, tools, and methodologies4+ years supporting large-scale enterprise or global networks in fast-paced, complex environmentsWorking knowledge of DoD Architecture Framework (DoDAF) and related network architecture and planning guidanceHands-on experience with Juniper networking equipment (MX, EX, SRX switches, routers, and firewalls)Experience with Type 1 cryptographic devices (e.g., KG-175, KG-245 or equivalent)Proficiency with network monitoring and analysis tools (e.g., network automation, analytics, IPAM, and performance management tools)Experience with firewall and VPN technologies (IPSec/IKE, GRE, SRX platforms)Experience supporting IP services across multiple classified and unclassified environmentsIPv4/IPv6VPNMulticastQoSSDNSNMPVoIP / VTCStrong understanding of routing and transport protocols and technologies, including:OSPF, BGPMPLS, RSVP/LDPLayer 2/3 VPNs, VRFsMTU considerationsImport/Export routing policiesIAT Level II certification (per DoD 8570/8140 requirements)Preferred QualificationsMaster's degree in computer science or a related technical disciplineIndustry certifications such as:Juniper (JNCIA / JNCIS / JNCIP)Cisco (CCNA / CCNP / CCVP / CCDP or equivalent)ITIL v3 FoundationsISC² CISSPCompTIA Security+ About SITECSITEC is an employee- and customer-focused Information Technology and Professional Services firm specializing in the design, development, and delivery of state-of-the-art technology solutions. Our expertise spans cybersecurity, software engineering, and systems engineering in support of mission-critical government programs.We provide full life-cycle support to our customers, including continuous operations for Software Support Activities and Software Production Facilities. At SITEC, our people are our greatest asset, and we are committed to fostering an environment where technical excellence, innovation, and professional growth thrive.

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