System Administrator, Level 3

What You Will Do At Independent Software, as a Systems Administrator you will support secure, mission‑critical infrastructure across Linux and mixed Linux/Windows enterprise environments. This role supports a wide range of operational systems including virtualized infrastructure, containerized platforms, cloud‑hosted environments, and automated system administration solutions supporting DoD and Intelligence Community missions. Depending on experience level, you will assist with or lead system administration, troubleshooting, automation, virtualization, compliance support, and operational sustainment activities across complex enterprise environments. This position is ideal for candidates who enjoy working hands‑on with Linux systems, automation tools, virtualization platforms, and secure operational environments while supporting highly available mission systems. Key Responsibilities Deploy, configure, maintain, and troubleshoot Linux‑based systems and enterprise infrastructure Support mixed Linux and Windows operational environments Administer and maintain containerized environments and virtualization platforms including Proxmox Develop and maintain automation solutions using Ansible, SALT, and scripting languages such as Bash, Perl, or Python Support system hardening, patching, upgrades, and lifecycle management activities Maintain compliance with SSP documentation and STE/STN security requirements Support cloud‑hosted infrastructure and AWS‑based environments Configure and maintain CIFS and Centrify integrations within enterprise environments Troubleshoot system, application, network, and infrastructure‑related issues Support operational monitoring, system reliability, and performance optimization Develop and maintain technical documentation and operational procedures Collaborate with engineering, security, and operations teams to support mission requirements Participate in on‑call support and maintenance activities as required Required Skills and Qualifications Experience administering Linux systems in enterprise or operational environments Experience with scripting and automation using Bash, Perl, Python, or similar languages Experience with configuration management and automation tools such as Ansible or SALT Experience with virtualization technologies such as Proxmox or similar platforms Experience supporting containerized environments Understanding of SSP compliance and STE/STN support requirements Experience supporting cloud infrastructure and AWS environments Experience with CIFS and Centrify within enterprise environments Strong troubleshooting and problem‑solving skills Ability to work independently and collaboratively within operational teams Strong written and verbal communication skills Education and Experience Level 0 (SA0): No demonstrated Systems Administrator experience is required. Bachelor’s degree in a technical discipline from an accredited college or university is required. Five (5) years of Systems Administrator experience may be substituted for a bachelor’s degree. Level 1 (SA1): Five (5) years of experience as a Systems Administrator supporting programs and contracts of similar scope, type, and complexity is required. Bachelor’s degree in a technical discipline from an accredited college or university is required. Five (5) years of additional Systems Administrator experience may be substituted for a bachelor’s degree. Level 2 (SA2): Ten (10) years of experience as a Systems Administrator supporting programs and contracts of similar scope, type, and complexity is required. Bachelor’s degree in a technical discipline from an accredited college or university is required. Five (5) years of additional Systems Administrator experience may be substituted for a bachelor’s degree. Level 3 (SA3): Fifteen (15) years of experience as a Systems Administrator supporting programs and contracts of similar scope, type, and complexity is required. Bachelor’s degree in a technical discipline from an accredited college or university is required. Five (5) years of additional Systems Administrator experience may be substituted for a bachelor’s degree. Preferred Qualifications Experience administering Windows Server environments Experience supporting Windows Domain Controllers Experience supporting Microsoft Exchange environments Experience supporting secure DoD or Intelligence Community systems Experience supporting mixed‑platform enterprise environments Certifications A DoD 8570 IAT Level II baseline certification is required Clearance Requirement Must possess an active TS SCI with appropriate Polygraph to be considered for this role Why Choose Independent Software At Independent Software, our people are the mission. We’ve built a company around collaboration, integrity, and innovation and we make sure our team has the tools and support to grow, succeed, and thrive. When you join us, you will: Support critical national security missions that matter Be part of a close‑knit, employee‑first culture where your voice is heard Expand your skills through ongoing training, mentorship, and career development Enjoy competitive compensation, generous benefits, and work‑life balance Ready to take the next step in your career? Join us and be part of something bigger. Apply today. We’re an equal opportunity employer. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran or disability status. #J-18808-Ljbffr