AT&T Global Public Sector is a trusted provider of secure, IP enabled, cloud-based, network solutions and professional services to the Intelligence Community. We are dedicated to recruiting, developing and empowering a diverse, high-performing workforce that is passionate about what they do, committed to our shared values and dedicated to our customers' mission.Our National Security Team supports the intelligence community, providing, operating and assuring critical voice, video and collaboration services for the full spectrum of operations.AT&T has an opening for Tier 3 Network Engineer to support the Network Operations Center in providing network maintenance and troubleshooting on a flex schedule to cover non-core hours.Job Duties/Responsibilities:Support an organization's local area network (LAN), wide area network (WAN), customer networks, Intranet and Internet and other data communications systems or a segment of a network system.Monitor network to ensure network availability to all system users and perform necessary maintenance to support network availability.Proactively identify risks in the network and develop a plan to mitigate them. Provides support of numerous business requirements into telecommunications (eg, LAN, MAN, WAN, Voice and Video).Diagnose hardware and software problems, and replace defective components.Maintain and administer computer networks and related computing environments, including computer hardware, systems software, applications software, and all configurations.Plan, coordinate, and implement network security measures in order to protect data, software, and hardware.Operate master consoles in order to monitor the performance of computer systems and networks, and to coordinate computer network access and use.Perform routine network startup and shutdown procedures, and maintain control records.Design, configure, and test computer hardware, networking software and operating system software.Perform a full range of upgrades to the existing network architecture.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.Utilize complex network analysis tools to identify and correct problems in the network.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. Monitor alarms and alerts to identify network elements causing network degradation or failure.Monitor security posture of the network, and report suspected violations to designated authority.Coordinate with configuration management and implementation teams.Analyze network characteristics (eg, traffic, connect time, transmission speeds, packet sizes, and throughput) and recommends procurement, removals, and modifications to network components.Create and/or 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. Evaluate and recommend COTS applications and methodologies that can be acquired to provide interoperable, portable, and scalable information technology solutions.Perform analysis and validation of reusable software and hardware components to ensure the integration of these components into interpretable IM designsRequired Clearance:TSSCI with poly (#ts/sci) (#polygraph)Required Skills, Experience, and Education:Candidate must have hands on troubleshooting and fault isolation of IT business systems. Applicant must have a strong understanding of the OSI model and configuration of routing protocols such as EIGRP, OSPF, MPLS, BGP, LDP.Candidate must have a total of 12 years of applicable experience. The experience can be a combination of degree and work history. This can be a High School degree and 12 years of work history OR an Associate's and 10 years, a Bachelors' and 8 years, a Masters and 6 years or a PhD and 2 years of work history.Schedule and Location:Qualified candidate may perform duties from the HQ GNOC or the B-location GNOC.Schedule will mainly consist of non-core hours to provide extended Tier 3 coverage evenings/overnight.AT&T has a mandatory COVID Vaccine policy. The customer related to this position requires vaccination to go on site.Ready to join our team? Apply today!