The Opportunity KRUSH Tech is seeking a hands-on Senior Systems Administrator to manage, secure, and continuously improve internal U.S. IT infrastructure across Windows, Linux, cloud, and hybrid environments. Reporting to the Director of Information Technology, this person will resolve complex infrastructure issues, automate routine work, and support reliable, scalable operations.
Partner with IT, security, and business teams to strengthen infrastructure performance and implement technical controls supporting applicable government-contracting requirements.
What Success Looks Like (First 6 Months) - Documented, reliable infrastructure and current operational runbooks.
- Predictable patching, backup, and recovery testing with measurable results.
- At least one production automation eliminating recurring manual work.
- Trusted escalation support for complex infrastructure issues.
What You'll Do Infrastructure & Cloud - Administer and harden Windows Server, Linux, virtualized, cloud, and hybrid systems.
- Manage Microsoft 365, Azure, Entra ID, Active Directory, Group Policy, and endpoint management tools.
- Own patching, backup and recovery, capacity monitoring, and infrastructure lifecycle improvements.
- Support migrations, upgrades, and cost-effective infrastructure scaling.
Networking, Identity & Security - Manage LAN/WAN, VLANs, VPNs, routing, switching, and firewall configurations; troubleshoot complex network issues.
- Implement MFA, conditional access, SSO, access reviews, and account lifecycle controls.
- Remediate vulnerabilities, maintain secure baselines, and support NIST SP 800-171/CMMC technical control evidence as applicable.
- Coordinate with security teams and external providers on incidents and network segmentation.
Automation & Technical Leadership - Automate administration with PowerShell and/or Bash; maintain scripts, standards, and runbooks.
- Lead infrastructure deployments and improvements from planning through handoff.
- Serve as a senior technical escalation resource and mentor other IT team members.
- Communicate technical risks and recommendations clearly to business and IT stakeholders.
- Participate in the on-call rotation for critical infrastructure and security incidents.
RequirementsWhat We're Looking For - 7+ years of hands-on systems administration experience, including senior-level responsibility for complex infrastructure.
- Strong Windows Server, Active Directory, Group Policy, Microsoft 365, and Entra ID administration; working knowledge of Linux.
- Hands-on virtualization, endpoint management, backup/recovery, and core networking (DNS, DHCP, VLANs, VPNs, routing, firewalls).
- Experience with identity controls, hardening, patching, and vulnerability remediation.
- PowerShell and/or Bash scripting and successful delivery of infrastructure projects.
- Independent troubleshooting, clear documentation and communication, and willingness to participate in on-call support.
- Ability to pass a background check and comply with applicable security policies.
At this time, KRUSH Tech is unable to provide visa sponsorship for this role. Candidates must be authorized to work in the U.S. without the need for employer-sponsored visa support, now or in the future.
Preferred Qualifications - Government contractor, CUI, NIST SP 800-171, or CMMC environment experience.
- Microsoft 365 GCC High, Azure Government, AWS GovCloud, or other regulated cloud environments.
- Advanced Linux, AWS/Azure IaaS, Ansible, Terraform, or Python automation.
- PAM, zero trust, vulnerability management, SIEM, or SOC collaboration.
- Relevant certifications (AZ-104, Security+, CySA+, CISSP) or aerospace/defense/advanced manufacturing experience.
Disclaimer: This job description is intended to describe the general nature and level of work being performed. It is not intended to be an exhaustive list of all responsibilities, duties, or qualifications required. KRUSH Tech reserves the right to modify or assign additional duties and responsibilities as business needs evolve.
