IT Infrastructure Manager

IT Infrastructure Manager (Windows)

Location: South Florida
Employment Type: Full-time
Seniority Level: Senior
Environment: Mid-sized, fast-paced organization

Position Overview:

We are seeking an experienced and hands-on IT Infrastructure Manager (Windows) to lead and manage the administration of our Windows-based IT systems and messaging platforms. This role is vital to the successful operation, security, and scalability of our enterprise environment, which includes Active Directory, Exchange Server, Office 365, and Azure AD. The ideal candidate is a self-driven, senior professional who thrives in a hands-on role and has extensive experience in managing Windows Server environments, Exchange systems, and other core Microsoft technologies.

This position will require a deep understanding of Windows Server (2016/2019/2022), Exchange (on-prem and hybrid), and Microsoft 365 services, as well as a proactive approach to system optimization, troubleshooting, and security compliance.

Key Responsibilities:

Windows Systems Administration:

• Manage and maintain Windows Server (2016/2019/2022) infrastructure, including Active Directory, Group Policy, DNS, DHCP, file/print services, and network shares.
• Monitor system performance, availability, and capacity to ensure a stable and secure operating environment.
• Implement and enforce security measures (e.g., patch management, vulnerability remediation, security policies) to maintain system integrity and compliance with organizational standards.
• Administer virtualization environments using VMware or Hyper-V, ensuring optimal resource allocation and system performance.

Messaging & Exchange Administration:

• Oversee and support Exchange Server environments (2016/2019) and hybrid Exchange Online setups, managing mail flow, connectors, retention policies, transport rules, and public folders.
• Troubleshoot mail delivery and handle anti-spam/anti-malware configurations to ensure secure and reliable communications.
• Execute migrations and upgrades, such as moving from Exchange to Exchange Online or migrating mailbox data between environments.

Microsoft 365 / Office 365 Administration:

• Manage Microsoft 365 tenant services, including Exchange Online, SharePoint Online, Teams, OneDrive, and Azure Active Directory.
• Administer M365 security tools such as DLP, M365 Defender, Conditional Access, and MFA, to ensure user and data security.
• Manage user provisioning, license assignments, and access controls via Azure AD/Entra, ensuring proper permissions and compliance.
• Utilize PowerShell scripting to automate administration tasks, streamline reporting, and improve operational efficiency.

Leadership & Collaboration:

• Provide leadership and technical direction to a small team of IT professionals, ensuring they are aligned with organizational goals and standards.
• Collaborate with other IT teams to support cross-functional projects and ensure smooth system integrations and operations.
• Mentor junior administrators and foster a culture of continuous learning and improvement within the IT department.

Qualifications:

Required:

• 8+ years of hands-on experience in a Windows systems administration role, with a strong background in Windows Server, Active Directory, Exchange, and Office 365.
• Proven expertise in managing hybrid environments, including on-prem and cloud solutions (Exchange Server, M365, Azure AD).
• Advanced knowledge of Windows Server (2016/2019/2022) and related technologies, with a focus on security, performance tuning, and troubleshooting.
• Strong PowerShell scripting skills for automating administrative tasks and system management.
• Solid understanding of networking principles and security best practices for enterprise IT infrastructure.
• Ability to manage complex IT environments and handle critical incidents or system outages effectively.

Preferred:

• Bachelors degree in Information Technology, Computer Science, or a related field.
• Microsoft certifications such as:
  • Microsoft Certified: Windows Server Hybrid Administrator Associate
  • Microsoft 365 Certified: Enterprise Administrator Expert
  • Microsoft Certified: Messaging Administrator Associate
• Experience with VMware or Hyper-V virtualization platforms.

About Us:

At Four Squared Solutions, we provide innovative IT staffing, managed solutions, and consulting services that empower organizations to thrive. Headquartered in South Florida, we help our clients build dynamic IT teams and deliver exceptional technology solutions. We believe in connecting great people with great opportunities, fostering success both for individuals and businesses.

Equal Opportunity Employer (EOE):
Four Squared Solutions is an equal employment opportunity/affirmative action employer. We do not discriminate against any qualified individual based on sex, race, color, national origin, religion, sexual orientation, age, marital status, mental, physical or sensory disability, or any other classification protected by applicable laws. We comply with all employment eligibility verification requirements.