Senior Microsoft Security & Infrastructure Administrator

The Phoenix Group®; New York (NY); On-site; USD 120,000 - 180,000; Full time

Job summary

The Phoenix Group® is seeking a senior technologist to stay close to technology across infrastructure, identity, endpoint security, networking and automation. You will maintain and improve a Microsoft‑based environment, partnering with internal stakeholders and external providers to strengthen security and efficiency.

You will lead identity management (Entra ID, MFA, SSO), manage Microsoft 365, endpoints via Intune, and oversee security controls, patching, and disaster recovery.

Qualifications

• Strong hands‑on experience with the Microsoft technology stack, especially Entra ID, Microsoft 365, Intune, Defender, and Exchange Online.
• Experience in enterprise identity and access management, MFA, SSO, CA, and user lifecycle processes.
• Proven ability to secure Microsoft environments, manage patching, and perform incident response.

Responsibilities

• Administer and maintain Microsoft cloud infrastructure, endpoints, identity platforms, and related enterprise systems.
• Own identity and access management, including Entra ID, MFA, SSO, Conditional Access, and privileged access.
• Manage the Microsoft 365 environment (Exchange, SharePoint, Teams, OneDrive) and security/compliance features.
• Administer endpoint configuration and management through Intune and related tooling.
• Maintain network and connectivity infrastructure, including firewalls, VPN, and security controls.
• Monitor security technologies, investigate threats, and drive remediation with internal and third‑party resources.
• Oversee patching, vulnerability remediation, endpoint hardening, and security improvements.
• Assist with infrastructure upgrades, configuration management, and technology implementations.
• Maintain backup and disaster recovery processes and participate in testing.
• Document procedures, runbooks, and keep asset/licensing records up to date.
• Assist with audits and security assessments and implement AI/ emerging tech controls.

Skills

PowerShell

Microsoft 365

Entra ID

Intune

Exchange Online

Security Fundamentals

Identity & Access Management

Automation

Microsoft Graph

Incident Response

Networking Basics

Tools

Microsoft Graph

PowerShell

Defender

Intune

Exchange Online

Entra ID

Microsoft 365

SharePoint

Job description

The Phoenix Group® is seeking a senior technologist to stay close to technology across infrastructure, identity, endpoint security, networking and automation. You will maintain and improve a Microsoft‑based environment, partnering with internal stakeholders and external providers to strengthen security and efficiency.

You will lead identity management (Entra ID, MFA, SSO), manage Microsoft 365, endpoints via Intune, and oversee security controls, patching, and disaster recovery.