Tier IIII O&M Engineer

Leidos LLC; Yigo Municipality (GU); On-site; USD 92,000 - 167,000; Full time

Benefits offered by this job

Health and Wellness programs

Income Protection

Paid Leave

Retirement Plan

Job summary

Leidos is seeking a Tier III O&M engineer to support WAN and LAN networks, including incident resolution, routing changes, and firewall updates. You will act as a subject matter expert in WAN/LAN technologies and support data communications systems across sites.

The role covers operations and maintenance, monitoring performance, configuring hardware/software, and coordinating with implementation teams to optimize topology and site configurations. After-hours support may be required.

Qualifications

• Must comply with DoD 8140 IAT Level 2.
• Experience configuring boundary protection tech (Palo Alto, Cisco ASA, Forcepoint).
• Experience with Juniper/Cisco routers and switches.
• Knowledge of OSPF, BGP, VPNs, VRFs, MPLS.
• Understanding of routing, switching, IP, NAT, and security tech.
• Ability to read schematics and docs for maintenance.
• Experience with Service Now or similar ITSM tools.
• Strong verbal and written communication; MS Office proficiency.

Responsibilities

• Support O&M activities and administer LAN/WAN networks (OSPF, BGP, VRFs, VLANs, VRRP, MPLS).
• Monitor performance; configure hardware/software and OS components.
• Assess upgrades for network impact and advise on best technical approaches.
• Perform Tier 3 troubleshooting and problem resolution; develop procedures.
• Provide fault and performance management; respond to incidents after hours.

Skills

IAT Level 2

Palo Alto

Cisco ASA

Forcepoint

Juniper routers

Cisco switches

OSPF

BGP

VPNs

VRFs

MPLS

Boundary protection

Routing

NAT

ServiceNow

MS Office

Tools

ServiceNow

MS Office

Job description

Leidos has an opening for Tier III operations and maintenance (O&M) 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. Description of Job Duties/Responsibilities: 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.

Requirements

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.

Additional required qualifications

• Must comply with DoD 8140 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

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting: September 5, 2026 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range: Pay Range $92,300.00 - $166,850.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com.

Pay and Benefits

Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here.

Securing Your Data

Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to [e-mail].

Commitment and Diversity

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.