Senior IT System Administrator

At Vast, our mission is to contribute to a future where billions of people are living and thriving in space. Vast is developing next-generation space stations to ensure a continuous human presence in space for America and its allies, enabling advanced microgravity research and manufacturing, and unlocking a new space economy for government, corporate, and private customers. Using an incremental, hardware-rich and low-cost approach, Vast is rapidly developing its multi-module Haven Station. Haven Demo’s 2025 success made Vast the only operational commercial space station company to fly and operate its own spacecraft. Next, Haven-1 is expected to become the world’s first commercial space station when it launches, followed by additional Haven modules to enable permanent human presence by 2030. Our team is all-in, committed to executing our mission safely and on time. If you want to work with the most talented people on Earth furthering space exploration for humanity, come join us. Vast is looking for a Senior IT System Administrator , reporting to the System Administrator Manager, to support the development of the systems that will be required for the design and build of human-rated space stations. As a Senior IT System Administrator, you will be responsible for the management, support, and enhancement of the IT infrastructure, IT service delivery, and end-user IT experience. This role ensures the reliable operation and performance of our IT infrastructure and solutions for the site and beyond, playing a pivotal role in managing and overseeing IT systems. You will install and maintain user endpoint devices and support infrastructure managed by other IT teams while training users on complex systems and computer functions. This will be a full-time , exempt position located in our Long Beach location. Responsibilities: Enterprise Infrastructure Architecture & Design Design, architect, and implement enterprise-scale Windows Server infrastructure (2016/2019/2022) supporting 500+ endpoints and mission-critical operations. Lead the architecture and optimization of Active Directory Domain Services, including multi-forest/multi-domain design, trust relationships, site topology, and replication strategies. Design and implement Group Policy architecture at scale, including inheritance models, WMI filtering, security filtering, and loopback processing. Advanced Identity & Access Management Architect and maintain complex Active Directory environments, including forest/domain design, schema modifications, FSMO role management, and disaster recovery strategies. Design and enforce role-based access control (RBAC), privileged access management (PAM), and least-privilege security models. Optimize Active Directory performance including replication monitoring, database maintenance, and tombstone management. Enterprise Endpoint & Device Management Architect and manage enterprise endpoint solutions using Group Policy, Configuration Manager (SCCM), and endpoint management platforms Develop comprehensive endpoint security baselines aligned with CIS benchmarks, NIST 800-53, and CMMC requirements. Provide architectural guidance for cross-platform management (macOS via JAMF, Linux) in heterogeneous environments. Patch Management & Compliance Engineering Design and implement enterprise patch management architecture for servers and endpoints. Manage patch ring strategies, pilot groups, and phased deployment models to minimize operational risk. Coordinate patching schedules across production, staging, and development environments. Minimum Qualifications: 4+ years of experience in IT system administration in an enterprise environment. 4+ years of experience with endpoint management tools (e.g., JAMF, Intune, GPO). Demonstrable experience in patch management across diverse environments. Solid understanding of server operating systems (Windows Server, Linux) and virtualization platforms (e.g., VMware, Hyper-V). Experience with scripting languages like PowerShel…