AMERICAN SYSTEMS, an employee-owned company, is seeking a skilled Senior Linux Systems Administrator with 5+ years of experience and an active Top-Secret clearance to join our mission-critical team supporting our government customer at NWSC Crane, IN . At AMERICAN SYSTEMS, you’ll play a key role in delivering innovative solutions that empower the American Warfighter . Your expertise will help tackle the nation’s most complex technical challenges and give our forces a decisive edge against our nation's adversaries. As a Senior Linux Systems administrator with AMERICAN SYSTEMS, you will have the opportunity to: Support on-premises Production and Development Linux infrastructure and applications. Provide Tier II support for production and development environments, managing ticket submission and tracking. Monitor resource availability to meet customer requirements, ensuring sufficient hardware, software, and throughput. Review and optimize system performance to ensure peak efficiency and reliability for mission-critical applications. Analyze system resource usage and apply corrective actions when necessary. Review system and application logs, ensuring completion of scheduled tasks and backups. Create and manage user accounts, groups, and permissions; maintain local repositories. Perform interface administration, including sFTP, SFG, and shell scripting. Develop and maintain administrative scripts (e.g., BASH, Python) for system maintenance. Document and implement system administration solutions to meet business requirements. Provide project status updates, problem resolution, and system administration reports to management. Coordinate problem resolution with customers, team members, and vendors as needed. Assess and recommend improvements for system software and hardware to enhance efficiency and functionality. Collaborate with the Cybersecurity team to implement, monitor, and maintain cybersecurity compliance and vulnerability mitigations. Be entrusted with mentoring and/or training less experienced staff as part of team development efforts.