Senior Systems Administrator

Senior Systems Administrator | Chesterfield, MO, United States | Hybrid | $92,300.00 - $166,850.00 This employer is a respected leader in technology-enabled services and mission software, supporting critical defense and intelligence initiatives. They are seeking a Senior Systems Administrator to join a dynamic team that ensures customers have the tools to navigate evolving security landscapes and protect vital assets. This is an opportunity to contribute to high-performance, mission-critical systems in a fast-paced, secure environment. The Role • Lead system administration for Linux and Windows-based systems in secure, mission-critical environments. • Architect, manage, and optimize complex server, storage, and virtualization infrastructure. • Perform OS installation, configuration, hardening, and patching in compliance with security standards. • Monitor system performance, conduct root cause analysis, and resolve complex technical issues. • Oversee and maintain automation scripts and infrastructure as code. • Provide Tier 2/3 support and troubleshoot escalated user issues. What You'll Need • Bachelor’s degree in a relevant field or equivalent years of experience. • Current Top Secret clearance, with the ability to obtain TS/SCI with Polygraph. • DoD 8570 IAT Level II or III certification (e.g., Security+ CE, CASP+, CISSP). • Experience with Linux and Windows Server administration, virtualization platforms (VMware, KVM), and automation tools (Ansible, Bash, PowerShell). • Proficiency with cloud platforms (AWS GovCloud, Azure Government) and hybrid cloud environments. • Familiarity with STIG compliance, system hardening, and RMF processes. What's On Offer • Competitive salary and comprehensive benefits package including health, wellness, and retirement programs. • Opportunity to work on mission-critical projects impacting national security. • A collaborative and dynamic work environment focused on innovation and excellence. • Professional development and career advancement within a leading technology organization. Apply via Haystack today!