ManTech seeks a motivated, career and customer-oriented **Linux System Administrator** to join our team **.** This is a remote position. The DISS program provides support to our clients in providing accurate and timely medical services, via every system we touch. We support Linux-based computer systems that process military medical records and, ultimately, the medical providers and patients who utilize this data while providing healthcare. This is primarily an operations and sustainment role for the live Production environment. But also includes some lower environments, and DevOps work as we build out new infrastructure and migrate systems to containerized environments. **Responsibilities include but are not limited to:** + Troubleshoot and resolve issues with applications/servers, in a complex, ever-changing environment, without requiring a step-by-step guide; handle intense, high-stress, highly visible projects, mostly alone, without needing constant guidance and find the root cause, understand the problem and the environment, determine and present options for a permanent fix, get buy-in from relevant parties, and implement + Perform system setup, configuration, and routine maintenance tasks on various Linux distributions, including user account management, software installation, and system updates; set up and manage monitoring tools and respond to alerts promptly + Automation and Scripting: Develop and maintain shell scripts and automation tools to streamline system management and administrative tasks + Security and Compliance: Implement and maintain security best practices, including firewalls, access controls, and vulnerability assessments. Ensure compliance with industry standards and regulations + Configure and troubleshoot network services, TCP/IP, DNS, DHCP, and routing. Collaborate with network engineers to optimize network performance; collaborate with cross-functional teams and IT professionals to resolve technical issues and contribute to IT projects and initiatives + Software Management: Manage software packages and dependencies using package management systems. Ensure software is up to date and secure + Fine-tune system performance through kernel optimization, resource monitoring, and load balancing and maintain accurate and up-to-date documentation of system configurations, processes, and procedures; establish and maintain backup and disaster recovery solutions. Test and refine recovery procedures regularly **Minimum Qualifications:** + 7+ years of relevant work experience as a Linux Systems Administrator, with proficiency in managing various Linux distributions; a bachelor’s degree may be substituted for 4 years of experience + Ability to build/configure/manage Linux servers from the command line and write shell scripts for automation and task simplification and experience in programming and/or scripting languages such as JavaScript, Python, C++, or Java + Must understand Linux security best practices and how to harden systems, familiarization with network protocols, routing, and firewall configuration + Ability to troubleshoot and resolve issues with applications/servers, in a complex, ever-changing environment, without requiring a step-by-step guide; determine and present options for a permanent fix, get buy-in from relevant parties, and implement + Demonstrated ability to handle intense, high-stress, highly visible projects without guidance. + Must have a CompTIA Security+ certification, as well as a technical certification (Linux, AWS, Kubernetes, or similar) prior to starting this position **Preferred Qualifications:** + Experience working in an application troubleshooting or IT sustainment role which + Experience supporting a government contract, or a live Production environment + Familiarity with Bash scripting, Ansible, JBoss, SQL, Kubernetes/Rancher, AppDynamics, GitLab pipelines or other CI/CD tools, and/or Java or Python programming + Experience with Kubernetes and Rancher **Clearance Requirements:** + Must be a U.S. citizen and have current/active Secret clearance **Physical Requirements:** + Must be able to be in a stationary position more than 50% of the time + Constantly operates a computer and other office productivity machinery, such as a computer + The person in this position frequently communicates with co-workers, management and clients, which may involve delivering presentations ad must be able to exchange accurate information in these situations + The person in this position needs to occasionally move about inside the office to access file cabinets, office machinery, etc. ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at careers@mantech.com and provide your name and contact information.