Tier 3 System Admin Lead

DMI•Washington, DC

1d•Onsite

About The Position

DMI, LLC is seeking a Tier 3 System Administrator Lead who is accountable for the operational integrity of all servers across on-premises, virtual, and cloud environments. This role serves as the senior technical authority for systems administration, providing expert-level incident investigation and recovery across a mixed infrastructure that includes physical and virtual servers, AWS cloud instances, and enterprise storage solutions (PowerScale and Cohesity). The position supports 24x7x365 availability and partners directly with customer IT staff on systems health, security posture, and change management.

Requirements

Expertise in Linux and Windows server administration, including advanced command-line troubleshooting and shell scripting
Hands-on experience with AWS (EC2, S3, Route 53, VPC, Lambda, CloudWatch); AWS SysOps Administrator-level proficiency preferred
Experience administering Active Directory in multi-site enterprise environments
Familiarity with enterprise storage platforms (PowerScale, Cohesity preferred)
Experience operating within an ITIL 4 service management framework
Must be a U.S. Citizen

Nice To Haves

AWS Certified SysOps Administrator or equivalent preferred

Responsibilities

Maintain operational integrity of all on-premises, virtual, and cloud servers including patching, scaling, firmware upgrades, and hardware failure resolution
Administer Active Directory including FSMO role health, domain controller replication, SYSVOL integrity, DNS/SRV record validation, and directory services database maintenance
Manage AWS infrastructure including EC2 instance lifecycle, S3 bucket policies and lifecycle rules, Route 53 DNS and VPC routing, Lambda monitoring, and CloudWatch performance remediation
Administer enterprise storage environments including PowerScale and Cohesity; perform proactive monitoring and capacity management
Execute shell scripting for Linux/Windows administration tasks; maintain and update baseline system configurations in compliance with customer Standard Operating Environment (SOE)
Lead Tier 3 incident investigation and root cause analysis for Priority 1 and Priority 2 server and systems outages; provide technical direction to Tier 1/2 staff on escalated issues
Coordinate with customer IT Security on NIST-compliant controls, patch prioritization, and vulnerability remediation
Support data center operations including equipment racking, asset labeling, hardware decommissioning, and infrastructure documentation maintenance