Yulista Holding LLC Regular Maintain and secure the IT infrastructure supporting a collateral storage facility operating on a closed, isolated network. Responsibilities include administration of Windows and Linux systems, configuration of secure network services, management of backup and recovery processes, enforcement of access control, and implementation of security hardening measures. Essential Duties • Administer and maintain Windows and Linux servers in a closed network environment. • Manage user accounts, access permissions, and authentication controls. • Perform patching, system hardening, and secure configuration of operating systems and applications. • Configure and monitor firewalls, DNS, DHCP, and connectivity services. • Implement and test backup schedules and disaster recovery processes. • Maintain documentation, configuration baselines, and inventories. • Monitor logs and alerts for anomalies and troubleshoot issues. • Support hardware installation and maintenance within the facility. Supervisory Responsibilities None. May mentor junior staff as required. Desired Knowledge, Skills & Abilities • Proficiency with Linux and Windows administration. • Knowledge of networking fundamentals (DNS, DHCP, routing, firewalls). • Understanding of secure configuration standards and vulnerability remediation. • Familiarity with backup systems and disaster recovery. • Ability to script using PowerShell or Bash. • Strong analytical and documentation skills. Required Qualifications • Bachelor's degree in IT, CS, or related field; or equivalent experience. • 3 years of system administration experience. • Experience with Linux and Windows server environments. • Active DoW Secret clearance required. • Certifications such as Security+, Network+, RHCSA, or CCNA preferred. Working Environment Indoor, secure, access-controlled facility. No shift or on-call work required. PREFERENCE STATEMENT Preference will be given to Calista shareholders and their descendants and to spouses of Calista shareholders, and to shareholders of other corporations created pursuant to the Alaska Native Claims Settlement Act, in accordance with Title 43 U.S. Code 1626(g). EEO STATEMENT Additionally, it is our policy to select, place, train and promote the most qualified individuals based upon relevant factors such as work quality, attitude and experience, so as to provide equal employment opportunity for all employees in compliance with applicable local, state and federal laws and without regard to non-work related factors such as race, color, religion/creed, sex, national origin, age, disability, marital status, veteran status, pregnancy, sexual orientation, gender identity, citizenship, genetic information, or other protected status. When applicable, our policy of non-discrimination applies to all terms and conditions of employment, including but not limited to, recruiting, hiring, training, transfer, promotion, placement, layoff, compensation, termination, reduction in force and benefits. REASONABLE ACCOMMODATION It is Calista and Subsidiaries' business philosophy and practice to provide reasonable accommodations, according to applicable state and federal laws, to all qualified individuals with physical or mental disabilities. The statements contained in this job description are intended to describe the general content and requirements for performance of this job. It is not intended to be an exhaustive list of all job duties, responsibilities, and requirements. This job description is not an employment agreement or contract. Management has the exclusive right to alter the scope of work within the framework of this job description at any time without prior notice.