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# Sr Systems Administrator

- **Company:** Peraton Inc
- **Location:** Boston, MA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Active Directory, Cyber Security, Dynamic Host Configuration Protocol, Domainkeys Identified Mail, Domain-Based Message Authentication Reporting and Conformance (DMARC), Domain Name System (DNS), VMware ESX Servers, Microsoft Exchange Server, Information Technology Operations, Performance Tuning, Windows PowerShell, VMware Infrastructure, Private Cloud Environment, Virtual Environment, Network Server, Vmware
- **Published:** August 7, 2026
- **Apply:** https://us.experteer.com/career/view-jobs/sr-systems-administrator-boston-ma-usa-58834346

## About the Role

_ and align with CISA recommendations * Configure and manage ESXi/vCenter, patching and performance tuning * Architect and implement virtualization standards; perform hardware refresh/build-outs * Implement and optimize AD core services (DHCP, DNS), group policy, OU replication * Provide after-hours support rotations * Develop and document virtualization procedures * Ensure protection against ransomware and modern threats to data * Collaborate with Cyber Security team on security hardening Tasks * Bachelor's degree, 5 years of relevant experience OR Associate's degree, 7 years OR High School diploma, 9 years * U.S. Citizen or Green Card holder, able to pass background check * Hands-on administration of MS Exchange, VMware infrastructure, and Windows AD * In-depth knowledge of Active Directory, DNS, and Windows core services * Experience managing private cloud and highly available virtual environments * Experience with HPE ProLiant servers * Proven experience designing and aaaaaaaaaa
in ESXi/v8/v9 enterprise virtual infrastructure * Vendor and end-user troubleshooting experience * Ability to automate using scripts (PowerShell, Pearl, VBS) * Strong communication, analytical, and organizational skills * Ability to think strategically and prioritize multiple tasks Key requirements * overtime eligibility * shift differential * discretionary bonus * on-site parking * health benefits * retirement plan

## Description

Experteer Overview Peraton seeks a Sr Systems Administrator to manage Windows/AD, on-prem Exchange, and VMware environments in Boston. You will oversee Exchange health, backups, retention policies, and email security via Proofpoint, while implementing DKIM/SPF/DMARC. You will monitor and optimize VMware and ESXi/vCenter, support AD, DHCP, DNS, GPOs, and perform upgrades. You'll participate in after-hours rotation and help harden the virtualized infrastructure per CISA. This role supports critical national security IT operations with a hybrid onsite/remote schedule. Compensation / Benefits * Manage Windows/Active Directory environments (physical and virtual) * Maintain and monitor on-prem Microsoft Exchange environments, apply patches * Manage Proofpoint email security appliances and implement DKIM/SPF/DMARC * Coordinate backups with backup admins and participate in monthly restore tests * Manage email retention/archiving policies to meet legal requirements * Harden VMware environment and align with CISA recommendations * Configure and manage ESXi/vCenter, patching and performance tuning * Architect and implement virtualization standards; perform hardware refresh/build-outs * Implement and optimize AD core services (DHCP, DNS), group policy, OU replication * Provide after-hours support rotations * Develop and document virtualization procedures * Ensure protection against ransomware and modern threats to data * Collaborate with Cyber Security team on security hardening Tasks * Bachelor's degree, 5 years of relevant experience OR Associate's degree, 7 years OR High School diploma, 9 years * U.S. Citizen or Green Card holder, able to pass background check * Hands-on administration of MS Exchange, VMware infrastructure, and Windows AD * In-depth knowledge of Active Directory, DNS, and Windows core services * Experience managing private cloud and highly available virtual environments * Experience with HPE ProLiant servers * Proven experience designing and implementing ESXi/v8/v9 enterprise virtual infrastructure * Vendor and end-user troubleshooting experience * Ability to automate using scripts (PowerShell, Pearl, VBS) * Strong communication, analytical, and organizational skills * Ability to think strategically and prioritize multiple tasks Key requirements * overtime eligibility * shift differential * discretionary bonus * on-site parking * health benefits * retirement plan


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