Linux Windows System Administrator Jobs (NOW HIRING)

Principal System Administrator based in Marlborough, MA, internally known as Principal Analyst, Information Workplace Services collaborate and support exciting, critical programs with classified information system capabilities. Success in this role means you can develop, implement, and maintain secure, cost-efficient environments across various classified programs. Program teams rely on your collaboration and guidance to define computing requirements and create end-to-end solutions to solve complex IT infrastructure problems.

What You Will Do:

• Serve as a Windows System Administrator with deep expertise in Microsoft Windows 10/11, Windows Server 2019/2022, Linux Servers, Active Directory Domain Services, Group Policy, Skype, Exchange, MECM, PowerShell, and related Windows enterprise technologies within a large-scale, 24x7x365 environment.
• Design, implement, troubleshoot, and maintain both Linux and Windows Servers, Desktops, and Virtual OSs on a large-scale enterprise network whose systems are operational 24x7x365.
• Build, harden, and sustain secure and reliable Windows servers, desktop, and virtual infrastructures while ensuring adherence to DFARS, RMF, and the NIST Cybersecurity Framework.
• Build virtual servers, leveraging VMWare, Horizon, and other similar or associated platforms.
• Collaborate across Digital Technology, program teams, and cross-functional engineering groups to deliver cost-effective, best-practice hardware and software solutions and resolve complex infrastructure challenges.
• Ensure reliability and high performance through proactive monitoring, system optimization, and infrastructure management, maintaining a strong understanding of Windows performance requirements. Develop and maintain technical and operational documentation to continually enhance Windows services and capabilities.
• Lead performance tuning, patching, lifecycle management, licensing oversight, and hardware/software refresh activities to ensure ongoing system health and compliance.
• Respond to and resolve service and support requests with clear documentation and outstanding customer service. Troubleshoot complex Windows platform issues, conduct root-cause analysis, and support planned and unplanned maintenance activities outside standard work hours as required to maintain system availability and stability.
• Must obtain DoDD 8140/8570 baseline certification (CompTIA Security+ or equivalent) within 6 months of start date.
• Position requires 100% onsite work in a closed area, with up to 15% travel to supported RTX locations in MA, RI, and NH (typically within 45–90 minutes).

Qualifications You Must Have:

• Typically requires a University degree or equivalent experience and a minimum of 8 years of prior relevant experience or an Advanced Degree in a related field and a minimum of 5 years experience.
• Active and transferable U.S. government issued Secret security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.
• Experience in the design, implementation, and administration of Microsoft Windows and Active Directory environments.
• Experience managing users, groups, and permissions to ensure secure access, as well as performing backup, recovery, and efficient management of Windows systems and network resources.
• Experience with ESXi and VMWare virtualization technologies.
• Experience in applying secure system configurations, optimizing application and user settings, and troubleshooting complex Windows system and user-related issues.

Qualifications We Prefer:

• Expertise in implementing security and compliance controls aligned with industry regulations, internal policies, and high-security frameworks (NISPOM, JAFAN, JSIG, DFARS, DoD/RMF).
• Leadership, communication, collaboration, and organizational capabilities, with advanced technical writing skills for creating comprehensive documentation and knowledge bases.
• Experience administering Microsoft enterprise technologies including ADDS, WSUS, MECM/SCCM, MDT, PXE, PKI, Kerberos, IIS, SQL, Skype, and Exchange.
• Experience integrating Windows and Linux environments using Centrify, Samba, SSSD, and NIS.
• Experience with virtualization and VDI platforms such as VMware vCenter, vSphere, Horizon, ESXi, and related virtual compute technologies.
• Experienced with compliance, vulnerability assessment, auditing, and monitoring tools including ACAS, Splunk, Nessus, SCAP, STIG, Ivanti, Nagios, and SolarWinds.
• Experience in scripting and automation proficiency using PowerShell, Bash, Python, Perl, C, Terraform, Ansible, Chef, GitLab, and GitLab Runner.
• Experience with networking fundamentals and experience supporting engineering teams in software, simulation, and hardware development environments.

What We Offer:

• Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Safety, Trust, Respect, Accountability, Collaboration, and Innovation.