Senior Systems Administrator - Unix / Linux

Senior Systems Administrator - Unix / Linux Job LocationsUS-VA-Dahlgren ID 2025-2422 Category Information Technology Position Type Regular Full-Time FLSA Status Exempt Overview ESSENTIAL DUTIES AND RESPONSIBILITIES: Responsible for managing secure, high-performance Unix/Linux environments supporting mission-critical operations Perform daily administration of Unix/Linux systems across classified and unclassified environments. Manage system backup and recovery to ensure data integrity and business continuity. Conduct basic software management, including patching, updates, and version control. Implement security management protocols, including firewall configurations and vulnerability mitigation. Maintain library management for system documentation and software repositories. Ensure compliance with DoD cybersecurity standards under the IAT III designation, including system hardening and audit readiness. Install and configure hardware components and COTS software across operational systems. Operate systems in diverse environments, including virtualized and bare-metal deployments. Conduct performance tuning, resource allocation, and troubleshooting across hardware, software, and network layers. Administer systems using TCP/IP and other major network protocols. Utilize network security tools such as firewalls, intrusion detection systems, and vulnerability scanners. Stay current on attack methods and detection strategies to proactively secure systems. Manage enterprise systems and ensuring operational availability. Support cybersecurity posture through configuration and monitoring. Advise on system architecture and integration strategies. QUALIFICATIONS: Six (6) years of professional experience in Unix and/or Linux system administration of networks and software systems. Experience in system backup and recovery; basic software management; security management and library management; installation and configuration of hardware; operational systems and COTS software; operating computer systems in different operating environments; and sizing, performance, tuning, hardware/software/network trouble shooting and resource allocation. Qualified experience in different network protocols including TCP/IP and major network security tools such as: firewalls, knowledge of computing and networking vulnerabilities, attach methods and latest detection methods. This position is required to be designated as an IT Level 1 with a T5/T5R investigation with a CWF designation at the IAT III level or 451 Work Role Code with the proficiency level of Advanced. (e.g., CASP , CISSP, or equivalent) Must have a Secret clearance or higher depending on the contract requirements. ADDITIONAL QUALIFYING FACTORS: A satisfactory background screening, negative drug test, positive references and proof of identity and legal authorization to work in the United States and for TTC are required. The Tatitlek Corporation gives hiring, promotion, training and retention preference to Tatitlek shareholders, shareholder descendants and shareholder spouses who meet the minimum qualifications for the job. As an equal opportunity employer, The Tatitlek Corporation recognizes that our strength lies in our people. Discrimination and all unlawful harassment, including sexual harassment, in employment is not tolerated. We encourage success based on our individual merits and abilities without regard to race, color, religion, national origin, gender, sexual orientation, gender identify, age, disability, marital status, citizenship status, military status, protected veteran status or employment. Salary DOE