Linux/Unix System Administrator

Key Responsibilities: - Provide production support for applications on SUN Solaris, Red Hat Linux, Oracle Linux, Ubuntu, and AIX. - Administer Oracle Linux 8/7, RHEL 8/7/6, and Ubuntu: installation, version upgrades, and ongoing maintenance. - Integrate network services such as NFS, DNS, NTP, and Samba; implement SFTP servers. - Troubleshoot network protocols including DNS, TCP/IP, SMTP, and SNMP. - Use ticketing tools (ServiceNow, BMC Service Desk Express, Quick Base) to manage incidents and requests. - Write basic shell scripts (ksh, bash, perl) for automation of databases, applications, backups, and scheduling. - Manage storage, disk management, multipathing, Logical Volume Management (LVM), and logical partitioning. - Manage user accounts, system security, change management, and performance tuning. - Install SSL certificates, patches, hardware/software, and firmware upgrades. - Provide on‑call support, work with vendors to resolve system issues, and support 24/7 production environments. - Enforce hardening policies and verify compliance during audit cycles. - Integrate the Linux environment with Active Directory to provide Single Sign‑On (SSO). - Deploy custom syslog reporting solutions using rsyslog and MySQL for system alerts and notifications. - Deploy servers with custom repository templates to ensure stable management of the Linux environment. - Monitor system activities (CPU, memory, disk, swap) to prevent performance issues. - Administer software packages and patches, adding/removing packages and updating patches as needed. - Maintain thorough documentation of all activities, including OS and application patch levels, disk space, memory usage, and user activity. - Configure and manage cron jobs on servers. - Decommission old servers and maintain an inventory of decommissioned and new servers. What We're Looking For: - 3 to 5 years of experience as a Linux/Unix System Administrator. - Strong hands‑on experience with Oracle Linux, Red Hat Enterprise Linux, Ubuntu, SUN Solaris, and AIX. - Experience integrating network services (NFS, DNS, NTP, Samba) and implementing SFTP servers. - Proficiency in troubleshooting DNS, TCP/IP, SMTP, and SNMP protocols. - Familiarity with ticketing tools such as ServiceNow, BMC Service Desk Express, and Quick Base. - Ability to write shell scripts (ksh, bash, perl) for process automation. - Solid background in storage management, disk management, multipathing, LVM, and logical partitioning. - Experience managing user accounts, system security, change management, and performance tuning. - Knowledge of SSL certificate installation and patch/firmware management. - Ability to handle multiple tasks, work independently, and collaborate effectively within a team. - Experience providing on‑call support in 24/7 environments. - Understanding of security hardening policies and audit compliance. - Experience integrating Linux with Active Directory for SSO. - Familiarity with rsyslog, MySQL, and custom repository management. - Strong monitoring and documentation skills.