Senior Tech Support Engineer - IAM & Security (Jacksonville)

Open Systems Technologies; Jacksonville (FL); On-site; USD 81,000 - 99,000; Full time

Job summary

Open Systems Technologies is seeking a skilled Tier 2/3 IT Support professional in Jacksonville, FL. You will escalate and resolve complex system, network, and application issues, guiding tickets to root cause across on-premises and cloud environments.

You will manage Windows Server, Active Directory, DNS/DHCP, and Microsoft 365 administration while applying IAM and security controls. Local candidates preferred; direct hire with US work authorization required.

Qualifications

• 4+ years of hands-on technical support with Tier 2/3 responsibilities.
• Knowledge of identity and access management (IAM), endpoint security/EDR, firewall/VPN basics, phishing prevention, and vulnerability patching.
• Strong background in Windows Server, Active Directory/Group Policy, DNS, DHCP, TCP/IP, and Microsoft 365 administration.

Responsibilities

• Act as an advanced escalation point (Tier 2/3) for critical systems, network, and application issues, seeing tickets through to root-cause resolution.
• Manage, configure, and troubleshoot Windows/Active Directory environments, endpoint management solutions, and core cloud services (e.g., Microsoft 365 / Azure AD / Entra ID).
• Apply core security controls: manage user access, enforce least privilege principles, monitor security tooling, and assist in incident triage and vulnerability remediation.
• Administer endpoint security tooling (EDR/antivirus), patch management systems, and multi-factor authentication (MFA) workflows.
• Collaborate with network and systems engineering teams to diagnose server, connectivity, and infrastructure bottlenecks.
• Document standard operating procedures (SOPs), knowledge base articles, and incident post-mortems.

Skills

IAM

EDR

Firewall basics

Phishing prevention

Vulnerability patching

Windows Server

Active Directory

DNS

DHCP

TCP/IP

Microsoft 365

Tools

Windows Server

Active Directory

DNS

DHCP

TCP/IP

Microsoft 365

Azure AD

Entra ID

PowerShell

Job description

Open Systems Technologies is seeking a skilled Tier 2/3 IT Support professional in Jacksonville, FL. You will escalate and resolve complex system, network, and application issues, guiding tickets to root cause across on-premises and cloud environments.

You will manage Windows Server, Active Directory, DNS/DHCP, and Microsoft 365 administration while applying IAM and security controls. Local candidates preferred; direct hire with US work authorization required.