Platform Engineer - MSP Systems Administrator

Platform Engineer – MSP Systems Administrator

We are seeking a seasoned Platform Engineer to join a managed services team supporting a diverse, multi-tenant client base. This senior, production-facing role is responsible for the operational health of infrastructure, line-of-business applications, and platform services. The primary focus of this position is to serve as the escalation point for complex platform issues, ensuring ownership through resolution while continuously improving client environments.

Responsibilities (include but are not limited to):

• Serve as escalation point for complex infrastructure, application, and platform issues across multi-tenant client environments.
• Triage, configure, and tune monitoring and alerting platforms to reduce noise and prevent incidents.
• Diagnose and restore line-of-business applications including payroll, HR systems,  services.
• Manage Windows Server environments including disk remediation, services, Event Viewer diagnostics, file shares, and IIS logs.
• Perform SQL Server operational tasks including permissions, health checks, and integrity checks.
• Administer Microsoft 365 and Exchange Online including mail flow, licensing, and Power Shell management.
• Manage identity lifecycle across Active Directory and Entra .
• Configure and troubleshoot DNS and email authentication systems including SPF, DKIM, and DMARC.
• Administer firewall and VPN environments, specifically Forti Gate technologies.
• Manage endpoint environments including RDP/RDS/AVD and Intune/MDM policies.
• Lead client change management processes including scheduling, approvals, and deployments.
• Coordinate P1 incident response and vendor escalations with clear communication to stakeholders.
• Maintain accurate ticket lifecycle management within ITSM platforms.

Requirements:

• 5+ years of experience in a Managed Service Provider environment at a senior or Level 3 capacity.
• Strong expertise in Windows Server administration, including Group Policy and Hyper-V.
• Proficiency in Microsoft 365 and Exchange Online administration.
• Experience managing Active Directory and Entra .
• Knowledge of email authentication and DNS management.
• Firewall and VPN administration experience, preferably Forti Gate.
• Experience with RMM platforms and endpoint support tools.
• SQL Server operational experience.
• Power Shell scripting and automation skills.
• Experience supporting multi-tier business applications.
• Strong communication and stakeholder management skills.

Desired

Qualifications:

• Experience with payroll, HR, or financial systems such as MPAY, PrismHR, or Sage 50.
• Familiarity with public safety or CAD systems.
• Microsoft Azure infrastructure experience.
• Experience with FSLogix, RDSH, and profile container management.
• IIS administration experience.
• Familiarity with Microsoft GCC High environments.
• macOS support experience.
• Relevant Microsoft certifications preferred.

Education:

Bachelor's degree in relevant subject matter

ATR is an Equal Opportunity Employer (EOE) who will provide equal employment opportunity to employees and applicants for employment without regard to race, ethnicity, religion, color, sex, pregnancy, national origin, age, veteran status, ancestry, sexual orientation, gender identity or expression, marital status, family structure, genetic information, or mental or physical disability