System Administrator Microsoft 365 & Infrastructure (Onsite)

System Administrator Microsoft 365 & Infrastructure (Onsite)

System Administrator Microsoft 365 & Infrastructure (Onsite)

Get AI-powered advice on this job and more exclusive features. Direct message the job poster from Serigor Inc Job Title:

System Administrator Microsoft 365 & Infrastructure Location:

Columbia, MD (Onsite) Duration:

Full Time Position Overview: We are seeking a skilled and motivated

System Administrator

with strong expertise in

Microsoft 365 administration ,

Windows Server management , and

network security . This is a

hands-on, proactive

role responsible for maintaining the availability, performance, and security of our IT infrastructure while driving continuous improvement in operations. The ideal candidate will have proven experience managing

Microsoft 365 environments , configuring and maintaining

Windows-based servers , securing networks, and providing exceptional end-user support. Key Responsibilities Microsoft 365 Administration (40%) Manage and maintain the

Microsoft 365 (M365)

environment, including user provisioning, license assignment, security configurations, and access control. Provide Tier 2/3 support for

Microsoft 365 applications : Outlook, Teams, SharePoint, OneDrive, and related services. Administer

Exchange Online : mailbox creation, migration, configuration, distribution lists, spam filtering, and retention policies. Implement and enforce Microsoft 365 security best practices including

Multi-Factor Authentication (MFA) ,

Conditional Access Policies , and

Data Loss Prevention (DLP) . Create and maintain

PowerShell scripts

to automate administrative tasks and improve efficiency. Core System & Infrastructure Administration (50%) Install, configure, and maintain

Windows Server ,

Windows 10/11 , and networking equipment (routers, switches, firewalls). Manage

Active Directory (AD)

user accounts, security groups, and access permissions. Support

Azure Active Directory (Azure AD)

integrations in hybrid environments. Configure and manage

firewalls ,

VPNs ,

DNS ,

DHCP , and

TCP/IP networking . Monitor and maintain virtualization platforms (VMware, Hyper-V) as applicable. Perform system monitoring, patch management, backup operations, and disaster recovery testing. Document all system configurations, network diagrams, processes, and standard operating procedures. Security & Compliance (10%) Monitor and respond to alerts from

Managed Detection and Response (MDR)

platforms such as

Arctic Wolf . Assist with

Security Information and Event Management (SIEM)

tools for log review and incident response. Apply security updates, firmware upgrades, and operating system patches in compliance with IT security policies. Conduct vulnerability assessments and coordinate remediation efforts. Qualifications & Skills Required: 23+ years of experience in

Microsoft 365 administration

and

Windows Server management . Strong working knowledge of

Exchange Online ,

Teams ,

SharePoint ,

OneDrive , and

Active Directory . Experience with

network configuration ,

firewalls ,

VPNs ,

DNS ,

DHCP , and

TCP/IP . Familiarity with

security monitoring tools

and MDR services such as Arctic Wolf. Proficiency with

PowerShell scripting

for automation and administration tasks. Strong troubleshooting skills and ability to resolve complex technical issues independently. Preferred: Microsoft certifications:

MS-900 ,

MS-102 ,

AZ-104 , or equivalent hands-on expertise. Experience with

SIEM platforms

and

managed security services . Knowledge of

ITIL best practices

for incident, problem, and change management. Exposure to

cloud identity management

and hybrid Azure AD environments. Soft Skills Excellent problem-solving, troubleshooting, and analytical skills. Clear and professional communication skills with both technical and non-technical users. Highly organized with the ability to manage multiple priorities in a fast-paced environment. Customer-focused mindset with proactive engagement. Self-motivated, adaptable, and eager to learn new technologies. Seniority level

Seniority level

Mid-Senior level Employment type

Employment type

Full-time Job function

Job function

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