• Tier 3 Network Systems

    Leidos (Scott Air Force Base, IL)
    **Description** Leidos is seeking an experienced ** Network Systems ** **Subject Matter Expert (SME) to provide Tier 3 ** sustainment support to a mission ... + Resolve escalated network and security support issues ( Tier 3 ). + Independently conduct network assessments, identify possible vulnerabilities,… more
    Leidos (08/23/25)
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  • Cyber Security Operations Specialist III…

    CACI International (St. Louis, MO)
    Cyber Security Operations Specialist III - Tier 3 Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: TS/SCI Employee ... * **The Opportunity:** Join our team as a CSOC Tier 3 Engineer and play a critical...Incident Case Management System (ICMS), and other authorized reporting systems . + Develop, maintain, and execute custom scripts, tools,… more
    CACI International (08/23/25)
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  • Network Administrator II

    William C Brown Inc (St. Louis, MO)
    …all the network architecture and devices. What You'll Get to Do: + Provide Tier 2 and Tier 3 problem identification, diagnosis and resolution of problem ... or any combination thereof + Troubleshoot, maintain integrity and configure network components along with implementing operating systems enhancements to… more
    William C Brown Inc (07/16/25)
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  • Network Administrator II

    CACI International (St. Louis, MO)
    …resolution for all the network architecture and devices. **Responsibilities:** * Provide Tier 2 and Tier 3 problem identification, diagnosis and ... or any combination thereof * Troubleshoot, maintain integrity and configure network components along with implementing operating systems enhancements to… more
    CACI International (07/02/25)
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  • Transport / IP (Trip) NOC Technician

    Leidos (O'Fallon, IL)
    …troubleshoot utilizing procedures to isolate where the fault occurs; identify failed network element(s) ie systems , hardware, software, circuits, or facilities; ... **Description** **PROGRAM SUMMARY:** Our customer is the Defense Information Systems Agency (DISA) and acts as the provider of...and acts as the provider of GIG/Defense Information System Network (DISN) services to its customers, the department of… more
    Leidos (08/08/25)
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