Information Technology (IT) Systems Administrator (Systems Application Analyst 3) - 27302

HII's Mission Technologies division•Monrovia, CA

About The Position

HII-Mission Technologies in Mountain View, CA is seeking an experienced and highly capable Information Technology (IT) Systems Administrator for the Defense Innovation Unit (DIU) to serve as a cornerstone of the IT team’s technology operations. Candidate should be a technologist with experience in both modern commercial IT delivery and multiple classification levels of government systems. Candidate should be able to independently configure complex infrastructure, mentor peers, and drive operational excellence across the full IT stack. This role spans the full depth of IT administration: delivering expert-level Tier 1 and Tier 2 end-user support across multiple channels and platforms, managing enterprise network and cloud infrastructure, leading endpoint and mobile device management, and contributing directly to IT policy, procurement, and project planning. The right candidate is equally comfortable imaging a Windows or Mac workstation, managing network infrastructure, configuring SaaS platform solutions, and training end users on advanced enterprise applications. DIU’s environment is fast-paced and mission-critical, working at the intersection of technology and national security — your contributions directly support high-stakes outcomes. You must bring strong independent judgment and the ability to work both autonomously and as a core part of a collaborative IT team.

Requirements

5 years relevant experience with Bachelors in related field; 3 years relevant experience with Masters in related field; 0 years’ experience with PhD or Juris Doctorate in related field; or High School Diploma or equivalent and 9 years relevant experience
Security + certification
3+ years of experience in technical support or a similar role
WIN, macOS, Linux, iOS, and android
Experience with helpdesk ticketing systems
Experience in NIPR, SIPR, and JWICS
Experience on Google Workspace, AWS, GCP, SIEM, ACAS, XDR, and Linux
Experience with Automation scripts/shell - Bash, Powershell, zsh, and python
Experience with Network configuration and maintenance- Cisco, Palo Alto Networks, Meraki, and Aruba
Strong problem-solving and analytical skills
Excellent communication and customer service skills
Ability to work independently and in a team environment
Good work ethic and is a go-getter
Must be US Citizen
Clearance: Secret

Nice To Haves

TS/SCI clearance
Experience with SIEM, ACAS, XDR, and Linux
Hands-on experience with FedRAMP-authorized cloud platforms and demonstrated understanding of federal IT security requirements and compliance frameworks
Hands-on experience with zero-trust architecture principles and modern identity platforms (e.g., Okta, Azure AD/Entra ID, Lastwall)
Experience configuring enterprise VTC/AV systems (Zoom Rooms, Cisco Webex, or equivalent)
Familiarity with server virtualization (VMware, Hyper-V) and/or containerization (Docker, Kubernetes)
Experience contributing to or authoring IT policies, documentation, or formal IT project plans
Familiarity with NIST SP 800-53, DISA STIGs, CMMC, or related federal security control frameworks
Relevant certifications such as CompTIA Security+, Network+, CySA+; Microsoft 365 Certified (Administrator Expert or Security Administrator); Google Professional Cloud Administrator; or CISSP

Responsibilities

Provide expert technical assistance and support to end users via email, phone, web teleconference, and in person
Troubleshoot and resolve complex hardware and software problems across Windows, macOS, iOS, and cloud Software as a Service (SAAS) environment
Triage, prioritize, and track issues and document in helpdesk ticketing system (e.g., ServiceNow)
Provide in-person video teleconference (VTC) setup, configuration, and real-time support for senior leadership and mission-critical meetings
Lead onboarding and out-processing of users for IT, including account provisioning, device configuration, access rights assignment, secure data handling procedures, and end user orientation
Own the full lifecycle of end-user devices — laptops, desktops, mobile phones, and tablets — across Windows, macOS, iOS, and Android platforms
Perform system reformatting, reimaging, and OS reinstallation across all supported platforms with speed and consistency
Configure, enforce, and maintain MDM/UEM policies (e.g., NinjaOne, Kandji, Microsoft Intune) to ensure security compliance, patch currency, and organizational standards
Administer and monitor LAN/WAN infrastructure including routers, managed switches, wireless access points, and next-generation firewalls
Design, configure, and maintain network segmentation, VLANs, and access control policies
Manage VPN and remote access solutions for hybrid and remote users
Configure and maintain server infrastructure (physical and virtual)
Serve as the primary administrator for cloud productivity platforms including Google Workspace and/or Microsoft 365, managing users, groups, licenses, permissions, and security configurations at an organizational level
Administer cloud infrastructure and SaaS applications hosted in FedRAMP-authorized environments (e.g., Salesforce, ServiceNow)
Own identity and access management (IAM) including SSO configuration, MFA enforcement, conditional access policies, and role-based access controls
Monitor cloud platform health, capacity, and usage metrics; proactively implement improvements to reliability, performance, and cost efficiency
Own and enforce IT security policy across endpoints, mobile devices, accounts, and network infrastructure
Lead vulnerability management activities including patch cadence management, configuration audits, and software update compliance across all managed systems
Conduct and support security access reviews, system audits, and compliance documentation in alignment with applicable federal frameworks
Ensure the security and integrity of organizational data across all platforms and transmission channels
Actively participate in planning, implementation, and maintenance of IT projects, contributing technical expertise and operational perspective from conception through completion
Contribute to the development, refinement, and enforcement of IT policies and procedures, ensuring they reflect operational realities and organizational risk tolerance
Create and maintain comprehensive and accurate IT documentation — runbooks, standard operating procedures, network diagrams, system configurations, and asset inventories