Sr. Tier III O&M Engineer

Leidos Holding$92K — $166K *
Information Technology
15+ years of experience
Job Overview by Ladders

Qualifications

  • TS SCI with a Poly required
  • 16 years of relevant experience (Doctorate + 8, Masters + 10, etc.)
  • DoD 8570 Information Assurance Technical (IAT) Level 2 compliance
  • Experience with boundary protection technologies (e.g., Palo Alto, Cisco ASA)
  • Proficiency in configuring/troubleshooting Juniper and Cisco routers and switches
  • Working knowledge of network protocols (OSPF, BGP, VPNs)
  • Superior verbal and written communication skills

Responsibilities

  • Support and administer LAN and WAN networks
  • Monitor network and system performance
  • Configure and test hardware and software components
  • Evaluate user requests for network improvements
  • Perform tier 3 troubleshooting and issue resolution
  • Prepare troubleshooting procedures for optimal network performance
  • Analyze network metrics and recommend component modifications

Benefits

  • Flexible work hours
  • Access to professional development programs
  • Health and wellness benefits
  • Retirement savings plan
  • Opportunities for certification and training
Full Job Description

The Digital Modernization Sector at Leidos is seeking aSr. Tier III operations and maintenance (O&M) engineer to support various WAN and LAN networks. Will provide incident resolution, routing changes, firewall changes; act as subject matter expert in WAN and LAN technologies; support 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, VRFs, VLANs, 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 O26M 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 with a 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, masters and 10 years, bachelors 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, VPNs, VRFs, 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



Original Posting:
June 30, 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 onlyand 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.

About Leidos Holding

Leidos Holding Careers

Joining Leidos Holding presents an unparalleled opportunity to advance one's career with a leader in innovation and technology. The company offers a plethora of job opportunities aimed at fostering professional growth and development in a diverse and inclusive environment.

Explore Career Opportunities

Leidos Holding is actively seeking skilled professionals who are passionate about leveraging their expertise to drive innovation and leadership in their fields. With a variety of open positions, Leidos Holding provides a platform for individuals to challenge themselves in a dynamic work environment.

Innovation and Professional Growth

At Leidos Holding, innovation is at the core of everything they do. Employees are encouraged to think creatively and push boundaries. The company supports this drive for innovation through comprehensive professional development and diversity training programs that are designed to enhance skills and foster leadership.

Commitment to Diversity and Inclusion

Leidos Holding is committed to creating a workplace where diversity is not only recognized but celebrated. With a culture that values and promotes diversity, Leidos Holding ensures that all team members have the opportunity to contribute, learn, and grow.

Internship Programs

For those starting their career, Leidos Holding offers internship programs that provide a robust foundation in the industry. Internships are a great way to develop essential skills, gain valuable work experience, and build professional networks.

Benefits and Culture

Employees at Leidos Holding enjoy a range of benefits designed to support their professional and personal lives. The company culture is built on a foundation of respect and integrity, providing a supportive and collaborative environment where every team member is valued.

Join the Team

Leidos Holding is hiring! Explore job opportunities that match your skills and interests. Leidos Holding looks for driven, curious, and innovative individuals to join their team. Positions are available across various disciplines and experience levels.

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Prepare for Your Interview

To prepare for an interview at Leidos Holding, candidates should familiarize themselves with the company's missions and values, update their resumes, and be ready to discuss how their background and skills align with the position they are applying for.

Networking and Career Advancement

Leidos Holding encourages its employees to engage in networking within the company to discover new opportunities for career advancement. The leadership team at Leidos Holding is dedicated to supporting employees in their career paths with ample opportunities for networking and growth.

Explore Leidos Holding Jobs and Careers

Discover the exciting career opportunities at Leidos Holding today. With a commitment to employee growth, innovation, and diversity, Leidos Holding is the perfect place to advance your career. Check out the latest job listings and find your perfect fit at Leidos Holding.

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