Senior Systems Administrator

Infinity Systems Engineering; Colorado Springs (CO); On-site; USD 110,000 - 170,000; Full time

Benefits offered by this job

Health benefits

401(k) plan

Paid vacation (3 weeks)

Sick leave

Job summary

Infinity is seeking a Senior IT Systems Admin/Engineer in the United States for mission-critical defense systems. The role involves setting up administrator and service accounts, maintaining system documentation, tuning performance, and installing system-wide software.

Candidates should have extensive experience in planning, integration, and lifecycle management of IT infrastructure. The position requires Top Secret SCI clearance at start date, hands-on experience with Windows Server, Linux,

Qualifications

• Bachelor's degree or equivalent experience.
• 20+ years in Systems/Network Administration for mission-critical defense systems.
• Top Secret SCI clearance required at start date.
• Security+ or equivalent certification required.
• Experience with Windows/Linux administration, VMware vSphere, and patch management.
• Familiarity with RMF/NIST security frameworks and RBAC.

Responsibilities

• Install, configure, and maintain operating systems and system management tools.
• Monitor and optimize system performance and availability.
• Troubleshoot hardware, software, and networking issues; provide timely solutions.
• Implement security measures including firewalls, IDS/IPS, and access controls.
• Manage backups (Veritas NetBackup) and disaster recovery testing.
• Administer networks (LAN/WAN/VPN), and server deployments.
• Provide user support and train staff on IT systems.
• Perform regular patching and software updates.

Skills

Security+

Top Secret SCI

RBAC

RMF

MFA

Troubleshooting

Documentation

Cross-functional

Scripting

Networking basics

Education

Bachelor's degree in CS/IT or related

Tools

Windows Server

Linux

VMware vSphere

KVM

NetBackup

Splunk/Grafana

PowerShell/Bash/Python

SQL/Oracle

Job description

Infinity's niche in the aerospace and defense industry is specialized solutions that help bridge the gap between space and ground. This is no small task, and we owe our success to our team who help us fulfill our mission; to match people with their legacies for betterment of the world. There is always a place at Infinity for a motivated, capable individual seeking a career to better the world. We prioritize supporting our team through exceptional benefits, work-life balance, and structured career development. At Infinity, WE ARE MORE -- now, come be more with us!

Job Summary

Seeking fulltime Senior Level IT- Systems Admin/Engineer. This role will perform a variety of technical tasks such as setting up administrator and service accounts, maintaining system documentation, tuning system performance, installing system wide software. The Systems Engineer will have experience and/or knowledge of the following: ability to tackle detailed technical assignments often requiring learning or developing planning and integration skills; proficiency in project planning and product life cycle management; performing design assessments and developing data driven solutions.

Key Responsibilities

System Maintenance and Administration

• Install, configure, and maintain operating systems, application software, and system management tools.
• Perform regular system monitoring, verifying the integrity and availability of hardware, server resources, and key processes.
• Troubleshoot hardware, software, and networking issues, and provide solutions in a timely manner.

Security And Backup

• Implement and maintain security measures, including firewall, anti-virus, and intrusion detection/prevention systems.
• Manage user access controls, ensuring proper security protocols are followed.
• Perform regular backups and ensure disaster recovery plans are in place and tested.

Network And Server Management

• Maintain and administer computer networks, including LANs, WANs, VPNs, and wireless systems.
• Set up and configure new servers, and ensure their performance meets business needs.
• Monitor network performance and optimize it for availability and efficiency.

User Support And Training

• Provide technical support and troubleshooting assistance to end-users.
• Maintain documentation of systems, processes, and configurations.
• Assist with onboarding and training of new staff on relevant IT systems.

System Performance And Optimization

• Analyze system logs and identify potential issues with computer systems.
• Optimize system performance, ensuring all systems run efficiently and securely.
• Ensure the availability of IT services and respond promptly to incidents and service requests.

Software And Patch Management

• Perform routine updates of software, operating systems, and security patches.
• Ensure software licensing compliance and manage vendor relationships for IT products and services.

Qualifications

• Education: Bachelor's degree in Computer Science, Information Technology, or a related field or equivalent combination of experience in lieu of degree.
• Experience: 20+ years of experience as a Systems Administrator, Network Administrator, or similar role supporting mission-critical defense systems
• Clearance Requirement: Top Secret SCI (required at start date)
• Required Skills:
• CompTIA Security+ or equivalent certification
• Hands-on experience with system administration, security, and network management
• Proficiency with Enterprise Level Windows Server and Linux systems administration
• Hands-on experience with Automation tools (Bash, Python, PowerShell, Perl, Expect) for orchestration, log parsing, API interaction, and creation of reusable modules and functions to streamline repetitive workflows
• Database Administration (Oracle, SQL Server)
• Proficient with low level troubleshooting utilities an system monitoring tools (e.g., ping, traceroute, nslookup, iperf, Wireshark, HP OpenView, LogRythm, Tripwire) and systematic root cause analysis of latency, packet loss, and asymmetric routing scenarios
• Hands on experience with VMware vSphere (ESXi, vCenter) and/or KVM clusters, including resource pools, DR-S, and live migration strategies
• Patch Management & Configuration Control
• Security Operations - Enforcement of least privilege RBAC models, STIG Hardening, RMF compliance, MFA implementation across privileged accounts, vulnerability remediation, and endpoint hardening aligned with NIST/ISO security frameworks
• Knowledge of network protocols, firewalls, VPNs, and security best practices.
• Experience with Veritas NetBackup
• Excellent problem-solving and troubleshooting skills
• Strong communication skills to interact with users and team members
• Ability to prioritize tasks and work independently
• Detail-oriented and capable of documenting procedures effectively
• Preferred Skills/Certifications:
• Cryptological devices (TACLANEs, SKLs, and/or loading key materials)
• Monitoring and maintenance of network attached storage (e.g., Dell EMC)
• System backup/restoral and backup tools
• Knowledge of database health and status checks is a plus
• Systematic Problem Solving -- Methodical, data driven diagnostic approach leveraging logs, metrics, and monitoring platforms (e.g., Splunk, Grafana, etc.) to isolate and resolve complex incidents
• Cross Functional Collaboration -- Partner effectively with senior engineers, development teams, and business users to align solutions with architectural standards and business objectives
• Continuous Learning & Mentorship -- Proactively pursue emerging technologies, certifications, and hands on labs; mentor junior staff and disseminate best practices t throughout the team
• Technology Vigilance -- Stay abreast of industry trends, threat landscapes, and vendor roadmaps; integrate new capabilities into existing environments to drive efficiency and resilience
• Multitasking & Prioritization -- Manage concurrent projects while maintaining focus on service level agreement compliance and escalation protocol

Work Environment/Physical Requirements

• Ability to lift and carry equipment weighing up to 50 lbs.
• Ability to perform tasks such as connecting cables, installing hardware, and setting up workstations.
• Standing, sitting, and bending for extended periods.

Work Schedule

This is a full-time position, typically working 40 hours per week. Overtime may be required depending on operational needs.

Infinity Benefits

• Great Company Culture.** Infinity firmly believes that our success is due to the happiness and personal satisfaction of our employees.
• Health Benefits.** *100% Company Paid monthly* Medical and Dental premiums for you AND your family.
• Prepare for the Future.** 401(k) company contribution, with free professional financial planning advisors
• Rest and Relaxation. **Three weeks' Vacation -- and *we offer an annual company reward trip after one year of employment. *
• Health and Wellness.** We offer 48 hours of sick leave, in addition to your Vacation, as well as Flex-Spending options (Medical and Dependent Care)
• Work that Stays at Work.** Genuine work/life balance and flexibility. We know our employees have lives outside of work and we support you in living them!
• Education and Professional Training Reimbursement. ** We support our employees career aspirations and growth through our Education Reimbursement Program!
• Profit Sharing Plan. ** Infinity's success is due to our employees which is why all eligible employees receive an annual payout based on our Profit-Sharing Plan.

U.S. Citizenship is required.

EOE including disability/vet