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# Senior UNIX System Engineer

- **Company:** CDO Technologies, Inc
- **Location:** Dayton, OH, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Unix, Command-Line Interface, Complex Networks, CompTIA Security+, Cyber Security, System Configuration, Data Centers, Disaster Recovery, Domain Name System (DNS), Firmware, Simple Mail Transfer Protocols, Network Time Protocols, Red Hat Enterprise Linux, Software Systems, Solaris (Operating System), Telnet, Oracle Linux, Virtual Local Area Networks, Diagnostic Tools, File Transfer Protocol (FTP), Selinux, Information Technology, Iptables, Patch Management, Hardware Infrastructure, Software Version Control, User Accounts
- **Published:** November 14, 2026
- **Apply:** https://diversityjobs.com/career/18929727/Senior-Unix-System-Engineer-Ohio-Beavercreek

## About the Role

* Active DoW Secret security clearance.
 * CompTIA Security+ certification.
 * Computing Environment certification, such as Red Hat; certification may be obtained within 30 days after project start.
 * 8 Years Experience in computer science or information technology with:
 * At least five years of experience as a UNIX Systems Administrator or IT Engineer, including task automation.
 * At least three years of patch-management experience, including YUM and RPM security-update processes.
 * At least three years of experience supporting complex networks, VLANs, and troubleshooting tools such as ifconfig, netstat, SSH, and Telnet.
 * At least three years of system-hardening experience using technologies such as firewalld, iptables, and hosts controls.
 * At least three years of experience managing local user accounts through command-line tools.
 * At least three years of experience developing and following SOPs for repeatable processes, disaster recovery, and common-problem resolution.
 * At least three years of experience configuring and maintaining DNS, SFTP, SMTP, and NTP services.
 * Strong interpersonal and collaborative skills., * Bachelor's degree in computer science or equivalent experience.
 * At least three years of SELinux administration and configuration experience.
 * Experience supporting cybersecurity patch management, STIGs, SRGs, RMF, SCA-V, and CORA activities.
 * Experience implementing hardware/software upgrades across geographically distributed organizations.

## Description

The Senior UNIX System Engineer supports a mixed and expanding Red Hat Enterprise Linux, Oracle Enterprise Linux, and Solaris UNIX environment. The role administers, secures, deploys, tunes, and sustains enterprise server infrastructure supporting Government and mission customers., * Administer, maintain, deploy, troubleshoot, and support UNIX/Linux servers in a complex customer environment.

 * Plan, implement, and support new hardware and software capabilities.
 * Monitor and tune system performance, availability, capacity, and operational health.
 * Harden systems, apply security updates, and report system security and operational status.
 * Create and maintain technical instructions, standard operating procedures, policies, and recovery procedures.
 * Manage firmware version control, preventive maintenance, and lifecycle support for data-center equipment.
 * Develop utilization reports, identify technical issues, and implement corrective actions.
 * Recommend and implement technology improvements that increase security, capability, efficiency, and scalability.
 * Support integration of new software and hardware components.