System Administrator

• CICS Administration & Maintenance: Install, upgrade, and maintain CICS Transaction Server (CICS TS) environments
• Apply patches (PTFs), manage version upgrades, and perform regression validation
• Configure and maintain CICS regions (production, test, DR)
• Maintain startup parameters and system initialization tables (DFHSIT)
• Performance Monitoring & Tuning: Monitor transaction performance and system health using tools such as: OMEGAMON / MainView / TMON
• Analyze: Transaction response times CPU utilization Storage usage
• Perform tuning to eliminate bottlenecks

Mainframe CICS System Administrator

• Provide administration, sustainment, and operational support for application services, virtualization infrastructure, and virtual desktop infrastructure operating within Classified Digital Services environments.
• Install, configure, maintain, patch, secure, and troubleshoot Windows-based application servers, virtual machines, virtual desktops, supporting services, and associated platform components.
• Support VDI platforms and virtual application delivery technologies, including virtual desktop pools, persistent and non-persistent desktop images, connection brokers, agent software, user profiles, published applications, and supporting infrastructure.
• Troubleshoot complex issues involving application delivery, virtual desktops, virtualization platforms, authentication, storage, networking, user profiles, printing, peripheral access, performance, and security-tool integration.
• Work with cybersecurity professionals to support vulnerability remediation, application and operating system patching, DISA STIG compliance, secure configuration baselines, scanning activities, findings resolution, and audit evidence requirements.
• Support the integration of application services and VDI platforms with enterprise identity, endpoint-management, monitoring, logging, vulnerability-management, and cybersecurity capabilities.
• Use automation and scripting technologies such as PowerShell, Ansible, Python, or comparable tools to improve application deployment, VDI administration, patching, configuration management, compliance validation, and operational sustainment activities.
• Identify opportunities to automate repetitive administration tasks, image maintenance, application delivery, health checks, reporting, patch validation, or secure configuration activities.
• Participate in testing and implementation of infrastructure changes, application upgrades, desktop-image updates, software deployments, security patches, and platform modernization initiatives.
• Assist with monitoring service health, platform capacity, virtual desktop availability, application performance, resource utilization, system events, and operational trends.
• Support account administration, privileged access, application permissions, service accounts, group-policy dependencies, and other access-control requirements in accordance with approved security procedures.
• Create and maintain standard operating procedures, system administration guides, application support documentation, VDI support procedures, architecture diagrams, automation documentation, test plans, implementation plans, troubleshooting guides, and knowledge articles.
• Provide technical support during service disruptions, root-cause investigations, recovery activities, planned maintenance, and mission-critical operational events.
• Perform other duties and assignments in support of CDS application, virtualization, endpoint, and cybersecurity operations.

Virtual Applications System Administrator

• Track all service requests to completion
• Resolve production incidents
• Identify top automation & self-service opportunities within our environment
• Documents best practices, knowledge base articles for existing and new systems
• Microsoft Cloud administration
• Identity management

Systems Administrator

• Systems Administrators provide front-line technical support for end users
• Actively listen to client problems and concerns to effectively remediate issues
• Escalate within and outside the team to ensure client service and experience are set at the highest levels
• Serve as a technical escalation point, providing mentoring support to staff
• Manage tickets and allocating resources as needed
• Perform complex repairs to software and peripheral equipment configurations
• Set up user accounts and configure email access
• Answer user inquiries and train users in the proper use of hardware or software
• Complete accurate time entry and documentation of remediation steps
• Participate in an on-call rotation (quarterly)

• Provide support for enterprise-level Linux-based systems
• Assist with installation, configuration, testing, and management of operating systems, hardware, and software
• Participate in information security, systems analysis, planning, monitoring, and system documentation activities
• Assist in installing, upgrading, patching, managing, and monitoring Linux systems, mostly RHEL
• Assist in configuring, managing, upgrading, and patching RedHat Satellite servers and package repositories
• Provide end-users and application users with support through incident management
• Learn and assist in performing compliance audits on production systems during the patch cycle
• Leverage SolarWinds Orion and Splunk for real-time monitoring and alerting of responsible systems response
• Assist in setting up IDM, Ansible, baseline OS image, Multi Factor Authentication (MFA) on RedHat Linux
• Learn and assist in addressing vulnerabilities that are identified through regular compliance scans
• Learn and assist in ensuring Critical Infrastructure Protection (CIP) compliance for servers in an air-gapped environment
• Provide legacy support for older applications that run on older versions of RHEL
• Assist in certificate management and deployment for services on responsible systems
• Update Federal Information Security Act (FISMA) information for compliance

Linux Systems Administrator I

• Install, configure, operate, and maintain Windows Server environments and associated roles and features in accordance with COSC standards and established procedures
• Administer and support Active Directory services, including user accounts, security groups, Group Policy, shared directories, and access permissions
• Install, configure, and maintain Microsoft IIS web servers, including application configuration and foundational security settings such as authentication and SSL
• Support and maintain data center hardware and infrastructure, including Dell PowerEdge servers, enterprise storage platforms, and backup systems, under established operational guidelines
• Monitor assigned systems and applications to ensure availability, performance, and reliability, taking proactive corrective action and escalating issues as appropriate
• Perform routine patching, updates, and system maintenance during established maintenance windows, including monthly scheduled patch cycles
• Participate in on-call rotations and respond to system interruptions, outages, or after-hours incidents in accordance with operational procedures
• Monitor backup operations and perform file, object, and system restores as required; assist with backup validation and testing activities
• Troubleshoot and resolve infrastructure and application issues, performing initial root-cause analysis and coordinating resolution with senior staff or vendors when necessary
• Collaborate with network engineers, vendors, and internal teams to ensure server systems integrate properly with enterprise network, security, and identity services
• Create and maintain technical documentation, including configuration guides, procedures, and operational runbooks to support knowledge sharing and continuity
• Adhere to COSC security standards, policies, and procedures to safeguard system integrity, availability, and data confidentiality
• Perform other related duties and assigned projects consistent with the scope of the role

• Provide end-user support through a ticketing system, including troubleshooting hardware, software, and network issues
• Diagnose root causes, implement solutions, and document resolutions clearly
• Escalate complex issues to senior IT staff or external vendors as needed
• Maintain and support desktops, laptops, printers, phones, and other IT equipment
• Assist with administration of Microsoft 365, Azure, and other SaaS/cloud platforms
• Support Windows Server environments , user accounts, and system access
• Install, configure, and upgrade hardware and software
• Monitor systems to ensure updates, patches, and security measures are in place
• Perform inventory tracking of IT assets and equipment
• Assist with disaster recovery processes including backups for virtual machines, files, email, and cloud systems
• Provide basic training and guidance to end users when needed

Junior IT – Systems Administrator

• Utilize your knowledge and skills regarding System & Service integration to include, but not limited to, authentication protocols, patch management, network segregation, and vulnerability management.
• Use multiple operating systems and hardware platforms to include OT (Operational Technology).
• Work with the Cyber & Compliance Teams to maintain RTX standards and DFARS requirements which include assessments, implementation steps, and ensuring the integrity of the security authorization package.
• Must be able to obtain Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security+ CE or equivalent certification) within 6 months of start date.
• Systems are operational 24x7 and occasionally require work effort beyond standard work hours.
• Will manage and allocate private IP space for a segregated network and corporate IPs from another IT team for firewall connections on the corporate network.
• Will set up VPNs on SonicWall devices between sites as needed for Technical Security and to support the IT Infrastructure Management Systems on this network.
• Will image new workstations and join them to the private networks Active Directory (AD).

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