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# Tier III operations and maintenance (O&M) network engineer

- **Company:** CareerCircle
- **Location:** Arlington, VA, United States
- **Salary:** $116,350.0 - $210,325.0
- **Contract:** Permanent contract
- **Skills:** Microsoft Word, Microsoft Excel, Application Programming Interfaces (APIs), Software Applications, Computing Platforms, Border Gateway Protocol, Bioinformatics, Cisco PIX, Cisco Routers, Cloud Computing, Configuration Management, Compilers, Information Systems, Computer Networks, Databases, System Configuration, Data Transmissions, Information Leak Prevention, Network Address Translation, Monitoring of Systems, Network Topologies, Identity and Access Management, Information Management, Internet Protocol, Internet Security, Intrusion Detection and Prevention, Subnetting, Virtual Private Networks (VPN), Multi-protocol Systems, Local Area Networks, Network Troubleshooting, Microsoft Office, Microsoft Visio, Network Configuration and Change Management, Network Architecture, Routing, Network Administration, Open Shortest Path First (OSPF), Microsoft PowerPoint, Cloud Services, System Software, Utility Software, Virtual Local Area Networks, Virtual Router Redundancy Protocols, Wide Area Networks, Private Cloud Environment, Network Routing, Computer Network Technologies, IT Architecture, Hardware Testing, HybridCloud, Firewalls (Computer Science), Juniper, Information Technology, Network Support, 3-tier Architectures, Cisco, Servicenow
- **Published:** September 3, 2026
- **Apply:** https://www.careercircle.com/jobs/all/all/usa/va/springfield/dd4b2d12-bf62-456b-9693-490af4d3ab05

## About the Role

Network Engineering
Microsoft PowerPoint
IT Service Management
Information Assurance
Performance Management
Information Technology
Information Management
Technical Communication
Border Gateway Protocol
Communications Security
Configuration Management
Network Address Translation
Juniper Network Technologies
Virtual Private Networks (VPN)
Network Performance Management
Open Shortest Path First (OSPF)
Troubleshooting (Problem Solving)
Virtual Local Area Network (VLAN)
Virtual Router Redundancy Protocols
Application Programming Interface (API)
Cisco Adaptive Security Appliance (ASA)
Network Configuration And Change Management
Top Secret-Sensitive Compartmented Information (TS/SCI Clearance), * TS SCI CI Poly

 * Candidate must have 16 years of experience that can be a combination of work history and education. This equates to a Doctorate and 8 years, master's and 10 years, bachelor's and 12 years, associates and 14 years or HS diploma and 16 years.
 * Must comply with DoD 8570 Information Assurance Technical (IAT) Level 2.
 * Experience in configuring and troubleshooting boundary protection technologies such as Palo Alto, Cisco ASA, and Forcepoint appliances
 * Experience with configuring and troubleshooting Juniper and Cisco routers and switches.
 * Experience with protocols such as OSPF, BGP, VPN's, VRF's, MPLS.
 * Working knowledge of boundary protection best practices
 * Understanding of routing, switching, Internet Protocol (IP) subnet, Network Address Translation (NAT) and security technologies
 * Demonstrated ability to engineer and modify rulesets to allow connectivity for new customer requirements
 * Demonstrated ability to read, understand, and develop schematic diagrams, technical manuals, and documentation such that the supported equipment and software can be maintained with minimal training
 * Working knowledge of Service Now or similar IT Service Management (ITSM) products
 * Superior verbal and written communication skills
 * Intermediate-level knowledge of MS Office products Word, Excel, PowerPoint, and Visio

## Description

Firewall
Equities
Cisco PIX
Compilers
Operations
Data Entry
ServiceNow
Subnetwork
Procurement
Market Data
Communication
Cisco Routers
Microsoft Excel
Network Routing
Ancient History
Microsoft Office
Network Topology
Fault Management
Operating Systems
Computer Networks
Wide Area Networks
Schematic Diagrams
Data Transmissions
Internet Protocols
Local Area Networks, The Digital Modernization Sector at Leidos has an opening for a Tier III operations and maintenance (O&M) network engineer to support the customer's various WAN and LAN networks. Will provide incident resolution, routing changes, firewall changes; act as subject matter expert in WAN and LAN technologies; support customer's intra- and inter- net and other data communications systems or segments of networked system., * Support operations and maintenance activities and administer networks including LAN and WAN technologies such as OSPF, BGP, VRF's, VLAN's, VRRP, MPLS.

 * Monitor the performance of systems and networks
 * Configure, and test hardware, networking software and operating system software
 * Review user requests for upgrades or additions to the network to assess impact on network performance and provide advice and guidance on the most practical technical approach to meeting user requirements
 * Perform long term O&M activities to include tier 3 troubleshooting and problem resolution
 * Prepare troubleshooting procedures for restoring the network to optimal performance levels
 * Provide fault management for the network and supports performance management functions
 * Respond, isolate, and resolve network troubles
 * Execute reporting functions and data input associated with network management
 * Coordinate with configuration management and implementation teams
 * Analyze network characteristics (e.g., traffic, connect time, transmission speeds, packet sizes, and throughput); recommend procurement, removals, and modifications to network components
 * Optimize network topologies and site configurations.
 * Coordinate requirements with users
 * Assess and document current site network configuration and user requirements
 * Maintain operating systems, communications software, data base packages, compilers, assemblers, and utility programs
 * Apply software, hardware, and standards information technology skills in the analysis, specification, development, integration, and acquisition of open systems for Information Management (IM) applications
 * Ensure these systems and applications are compliant with standards for open systems architectures, reference models, and profiles of standards - such as the IEEE Open Systems Environment (OSE) reference model - as they apply to the implementation and specification of IM solutions on the application platform, across the application program interface (API), and the external environment/software application
 * May have up to 10% COMSEC responsibilities, as needed.
 * Subject to be called in during afterhours for incident resolution., All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.
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