Title: Senior Systems Administrator Location: Remote, USA Job Description: Requisition # R67260 Locations USA-Remote Work Security Clearance Required Secret Remote Type Fully Remote Time Type Full time Description & Requirements Shape the future of defense with MANTECH! Join a team dedicated to safeguarding our nation through advanced tech and innovative solutions. Since 1968, we’ve been a trusted partner to the Department of Defense, delivering cutting-edge projects that make a real impact. Dive into exciting opportunities in Cybersecurity, IT, Data Analytics and more. Propel your career forward and be part of something extraordinary. Your journey starts now—protect and innovate with MANTECH! ***This is for a future opportunity*** MANTECH seeks a motivated, career and customer-oriented Senior Systems Administrator to join our CASTLE-NET Program team. This is a remote position. Be a part of an agile team to provide innovative, customer focused, and cost-effective integrated enterprise IT support services in support of the client’s vision of engineering solutions for the Nation’s toughest challenges. Responsibilities include but are not limited to: - Managing and maintaining the IT infrastructure to ensure reliability, performance, and security across Windows, Linux, and VMware environments. - Installing, configuring, and supporting servers and virtualized environments while working closely with developers and stakeholders to ensure compliance with best practices. - Maintaining comprehensive documentation of system configurations and procedures while ensuring maximum system security and availability. - Planning and leading major technology assignments and evaluating performance results to recommend changes affecting project growth. - Functioning as a technical expert across multiple project assignments, providing world-class IT services and responsive customer support. - Working with all stakeholders to ensure complete and functional systems that meet all requirements and exceed end-user expectations. Minimum Qualifications: - High School Diploma/GED with 12+ years of experience, or a bachelor’s degree in IT or Computer Science with 8+ years of experience in systems administration. - Comprehensive knowledge of relevant operating systems including Windows Server, Red Hat, and CentOS, as well as virtualization technologies like VMware vSphere. - Proficiency in scripting languages such as PowerShell, Bash, or Python for automation and performance tuning. - Experience with system monitoring, patch management, and implementing rigorous security remediations. - Must hold and maintain an 8140 IAT Level II compliant certification (e.g., Security+ CE, SSCP) upon hire. - Ability to maintain relevant technical certifications such as Microsoft Certified: Windows Server, RHCSA, or VMware Certified Professional (VCP). Preferred Qualifications: - Certified Information Systems Security Professional (CISSP certification). - Familiarity with the USACE IT environment, regulatory requirements, and data security best practices. - Self-starter with excellent people skills who can communicate effectively with technical and non-technical stakeholders to drive change throughout an organization. Clearance Requirements: - Must possess a Secret security clearance prior to starting this position. Physical Requirements: - The person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations. The projected compensation range for this position is $105,900.00-$177,300.00. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories. In addition, MANTECH invests in its employees beyond just compensation. MANTECH’s benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections.

Title: NCIS Systems Administrator | Active Top Secret clearance Location: USA VA Quantico Full Part/Time: Full time Job Req: RQ218796 Type of Requisition: Regular Clearance Level Must Currently Possess: Top Secret Clearance Level Must Be Able to Obtain: Top Secret/SCI Public Trust/Other Required: None Job Family: IT Infrastructure and Operations Job Qualifications: Skills: Mobile Device Management (MDM), Next-Generation Network (NGN), System Administration Certifications: None Experience: 5 + years of related experience US Citizenship Required: Yes Job Description: Transform technology into opportunity as a Systems Administrator at GDIT. Shape what's next for mission-critical government projects while shaping what's next for your engineering career. The Naval Criminal Investigative Service (NCIS) is an organization of approximately 2,000 personnel of which 700 serve at HQ and the remaining staff serve at offices worldwide. NCIS is the DON component with primary responsibility for criminal investigation, law enforcement (LE), counterterrorism (CT), counterintelligence (CI), and cyber matters. NCIS not only has primary responsibility for all criminal investigative, CI, CT, and cyber matters within the DON, but it also has exclusive investigative jurisdiction in non-combat matters involving actual, potential, or suspected criminal, terrorism, sabotage, espionage and subversive activities. MEANINGFUL WORK AND PERSONAL IMPACT As a Systems Administrator, the work you'll do at GDIT will be impactful to the mission of the NCIS team at Quantico, VA. - Administer, manage and maintain Windows servers 2019 and 2022. - Responsible for Windows Server patching in an operational environment. - Experience with the following: Domain controllers, Active Directory Federation Services (AD FS), Active Directory, DNS servers, DHCP and Group Policy Object. - Create, manage, and maintain accounts and groups in Active Directory, LDAP - Experience with PowerShell scripting. - Monitors system environments and resources. - Analyze, troubleshoot, resolve, and documents problems with business applications and hardware on all enclaves. - Oversees system recovery mechanisms. - Exhibit the capability to resolve issues independently. - Coordinate, communicate, escalate required changes, and major issues . - Help diagnose and resolve computer-related problems as requested by employees and contractors, either in person or by using remote control software. - Respond to telephone calls and email requests for technical support . - Accurately documents all work in ServiceNow. WHAT YOU'LL NEED TO SUCCEED - Security Clearance Level: Active Top Secret clearance (Must be TS/SCI eligible) - Required Experience: - 5+ years of experience with Systems Administration, general computer system, network administration, and user support experience - Experience in (MDM) support and solutions - Experience with the NGEN IT infrastructure and enterprise class networks - Ability to administer user accounts and device associations in Active Directory - Experience deploying DISA STIGs controls and system compliance - Must have prior experience with installation, operation, configuration, and maintenance of multiple types of business and end user-specific application software in a large government installation - Experience with one or more of the following: Domain controllers, Active Directory, DNS servers, DHCP and Group Policy Object - Innovative and collaborative environment encouraging of highly motivated critical thinking - Required Certifications: CompTIA Security+ CE - Education: BS Degree or equivalent Computer Science or IT related degree - Location: Hybrid - 3 days onsite at Quantico, VA / 2 days remote - US Citizenship required GDIT IS YOUR PLACE At GDIT, the mission is our purpose, and our people are at the center of everything we do. - Growth: AI-powered career tool that identifies career steps and learning opportunities - Support: An internal mobility team focused on helping you achieve your career goals - Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off - Flexibility: Full-flex work week to own your priorities at work and at home - Community: Award-winning culture of innovation and a military-friendly workplace OWN YOUR OPPORTUNITY Explore a career in software development at GDIT and you'll find endless opportunities to grow alongside colleagues who share your dedication to advancing innovation. #NCIScareers The likely salary range for this position is $93,662 - $108,100. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range. Scheduled Weekly Hours: 40 Travel Required: None Telecommuting Options: Hybrid Work Location: USA VA Quantico Additional Work Locations: Total Rewards at GDIT: Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most. We are GDIT. A global technology and professional services company that delivers consulting, technology and mission services to every major agency across the U.S. government, defense and intelligence community. Our 30,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50 countries worldwide, offering leading capabilities in digital modernization, AI/ML, Cloud, Cyber and application development. Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology.

Systems Administrator I Chicago, IL Who we are: Founded in 2001, Vivid Seats (NASDAQ: SEAT) is a leading online ticket marketplace committed to becoming the ultimate partner for connecting fans to the live events, artists, and teams they love. We believe in the power of experiences and are fiercely dedicated to building products that inspire human connections. Named as one of Built In's top places to work in 2025, we believe that our People are our greatest competitive advantage. To support our People, we have built a company culture that empowers our employees to embrace challenges, encourages unity through collaboration, and seeks to constantly evolve by leveraging data and inspiring innovation. We believe in harnessing emerging technology to power performance and unlock creativity. As part of our culture of innovation, we actively embrace the use of AI tools to enhance decision-making, improve workflows, and produce better outcomes for our customers. The Opportunity: As a System Administrator I at Vivid Seats, you will be responsible for designing, maintaining, and continuously improving a secure, scalable core infrastructure. Utilizing Microsoft Entra ID as our identity provider, you will drive security initiatives and productivity enhancements through single sign on, conditional access and application administration. You&rsquo;ll use data to build new cloud integrations, influence policy and configure endpoints via MDM. By proactively monitoring critical systems and you will be able to act upon abnormalities before they become problems. Your contributions to our user lifecycle process will ensure that it continues to scale and deliver a secure and positive experience. How your role contributes to the success of Vivid Seats: - Responsible for establishing, maintaining and improving upon core infrastructure including endpoint management systems, patch distribution systems, Windows servers and automated user-lifecycle processes. - Proactively identifies and minimizes adverse impacts to the environment such as certificate renewals and major software changes. - Stays current to technology trends and best practices, and can translate knowledge to specific improvement projects. - Documents and maintains system architecture through scalable conventions and best practices. - Establishes automated methods to reduce operational workload and improve user experience. - Works with key stakeholders to harden the environment through security improvements, audits and compliance enforcement. - Has a foundational knowledge of network infrastructure, troubleshooting and maintenance. Core Software Competencies: - Microsoft Entra ID - Microsoft Intune MDM - Jamf MDM - Powershell + Graph API - Cisco Meraki - PortNox - AWS</li> - Crowdstrike Falcon Complete - Microsoft Defender - Microsoft Purview How your role expectations will progress as a System Administrator I in the first 30, 90, and 180 days: 30 days in - Complete new hire orientation, gaining the resources you need to be successful. - Learn how ticket marketplaces operate and how you&rsquo;ll contribute to providing great experiences for our customers. - Acclimate to team and company norms, business objectives, and Vivid Seats values. - Learn to navigate our infrastructure and procedures. - Establish avenues of support and learn when and where to seek guidance. - Become familiar with team objectives and how they contribute to company goals. 90 days in - Contribute to our approaches, methods, or technologies to support overall business goals and drive team efficiencies. - Maintain, harvest and aid internal and external relationships to achieve progress and advance objectives. - Have deep familiarity with our cloud platforms and be able to make informed assessments. - Develop the ability to respond to and remediate break fixes. - Monitor technical operations and identify abnormalities. - Become comfortable maintaining and changing our network infrastructure as needed. 180 days in - Apply methods to execute individual tasks that positively impacts the team. - Play an active role in continued learnings to advance skill sets necessary for team goals. - Proactively monitor and adapt to vendor-initiated platform changes. - Become comfortable improving upon user lifecycle automations. - Investigate misconfigurations, identify improvements, influence process and policy. - Work with our independent auditors to answer infrastructure questions and provide evidence. What You&rsquo;ll Bring: - Strong technical proficiency in cloud infrastructure. - A passion for technology and a drive to improve upon it. - A strong sense of leadership and a desire to help the team succeed. - The ability to break down problems and document the resolutions. - Strong communication skills with a friendly attitude. - The ability to multitask without compromising quality. - A strong work ethic and ability to self-govern on projects. - Critical thinking skills that can interpret requests and develop secure, scalable solutions. We believe in harnessing emerging technology to power performance and unlock creativity. As part of our culture of innovation, we actively embrace the use of AI tools to enhance decision-making, improve workflows, and product better outcomes for our customers. Vivid Seats provides competitive compensation; bonus incentives; FLEX PTO; mental health days; medical, dental, and vision insurance; 401K matching; monthly credits and discounts for attending live events; remote work and snack allowances; and a variety of additional workplace perks. Location: Chicago, IL We believe in a hybrid 3 days/week in-office working model, which provides employees the flexibility to take advantage of in-person and remote collaboration. Check out our HQ office, bursting with the energy of live events fandom and the vibrancy of Chicago&rsquo;s rising tech scene. Our Commitment: We are an equal opportunity employer that values the critical importance of a diverse workforce and sense of belonging. Many of our roles have flexible requirements and we encourage you to apply regardless of whether you meet every qualification.

• Microsoft Platform Administration. • Administer and maintain Windows Server, Active Directory, Group Policy, and Microsoft 365 GCC services in accordance with SEC operational standards. • Provide Tier 1/2/3 operational support for Microsoft 365 GCC/GCC G5 collaboration and productivity services, including incident response, service requests, and escalation. • Manage user accounts, permissions, and security policies across Active Directory/Azure Active Directory, Exchange Online, SharePoint Online, and Teams. • Perform configuration, patching, and maintenance activities to preserve system stability, security posture, and service continuity. • Configure and maintain Azure resources, including virtual machines, storage accounts, and virtual networking components. • Administer Azure Active Directory identity services and access controls to support compliance and system integrity. • Support day-to-day operations for Exchange Online, SharePoint Online, Teams, and related Microsoft collaboration services. • Develop and maintain PowerShell automation scripts for recurring administration, maintenance, and reporting tasks.