Senior Systems Administrator

Mission Critical Partners is seeking a Senior Systems Administrator to support a fully cloud-based IT environment serving approximately 200 users across a diverse portfolio of SaaS platforms.

This role provides technical leadership and hands-on administration across Microsoft 365 GCC, Azure/Entra ID, and related cloud services, with a strong emphasis on security monitoring, identity management, endpoint management, automation, and compliance alignment (NIST).

The ideal candidate is highly self-directed, capable of independently owning infrastructure and security operations, and comfortable operating in a fast-paced, compliance-driven environment. This individual will serve as a senior technical resource responsible for maintaining secure, reliable, and scalable systems while driving operational improvements and mentoring junior staff.

The role requires a professional committed to success by embracing and living our core values of Persistence, Integrity, Trust, Accountability, and Prudence, Cloud Infrastructure & Identity Management

• Administer and optimize Microsoft 365 GCC, Azure/Entra ID, Exchange Online, Teams, SharePoint, and other enterprise SaaS platforms
• Manage identity and access controls, including Conditional Access, MFA, privileged access, RBAC, and identity lifecycle management
• Maintain and improve endpoint management, device compliance, and mobile device management using Microsoft Intune or equivalent platforms
• Configure and maintain cloud-based collaboration, storage, and communication services
• Support tenant administration, licensing, and policy management across Microsoft cloud environments

Security Operations & Compliance

• Monitor, investigate, and respond to alerts across Microsoft Defender and related security platforms
• Assist in implementing and maintaining security controls aligned with NIST and organizational security policies
• Support vulnerability management, endpoint protection, patch management, and security hardening initiatives
• Participate in incident response, root cause analysis, remediation efforts, and post-incident reviews
• Assist with audit readiness, compliance reporting, and evidence collection activities

Systems Administration & Operations

• Ensure availability, performance, reliability, and scalability of cloud-based systems and services
• Troubleshoot and resolve complex technical issues, escalations, and service interruptions
• Administer system configurations, updates, patching, and platform maintenance activities
• Support onboarding/offboarding processes from a systems, licensing, and access management perspective
• Maintain backup, recovery, and business continuity procedures for cloud services and critical systems
• Monitor system health, performance metrics, and operational alerts to proactively address issues

Automation & Continuous Improvement

• Develop and maintain PowerShell scripts and automation processes to improve operational efficiency and reduce manual effort
• Identify opportunities for process optimization, standardization, and infrastructure modernization
• Recommend and implement enhancements to systems architecture, security posture, and operational workflows
• Maintain and improve technical documentation, procedures, and configuration standards

Team Collaboration & Technical Leadership

• Provide technical guidance, mentorship, and knowledge sharing to junior IT staff
• Collaborate with leadership on strategic technology initiatives, system improvements, and long-term infrastructure planning
• Partner with internal stakeholders and vendors to support operational and security objectives
• Participate in cross-functional projects and enterprise technology deployments

Do you have experience in Zero Trust security?, * 5-8+ years of experience in systems administration, with a strong focus on cloud-first enterprise environments

• Strong experience administering Microsoft 365 and Azure/Entra ID environments
• Hands-on experience with Microsoft Defender (Endpoint, Identity, Office 365, or Cloud Apps)
• Solid understanding of identity and access management principles, security best practices, and Zero Trust concepts
• Experience with endpoint management platforms such as Microsoft Intune
• Familiarity with NIST or similar security and compliance frameworks
• Experience supporting enterprise SaaS applications and cloud-based infrastructure
• Strong troubleshooting, analytical, and root cause analysis skills
• Experience with system monitoring, patch management, and operational support processes
• Ability to work independently with minimal oversight while managing multiple priorities effectively
• Strong verbal and written communication skills with both technical and non-technical stakeholders, * Experience working within Microsoft GCC or GCC High environments
• PowerShell scripting and automation experience
• Experience supporting multiple SaaS platforms and cloud integrations
• Familiarity with Azure security, conditional access policies, and compliance management tools
• Experience with Microsoft Intune, Exchange Online administration, and endpoint security solutions
• Understanding of virtualization, networking fundamentals, DNS, DHCP, VPN, and cloud connectivity concepts
• Relevant certifications such as:
• Microsoft Certified: Azure Administrator Associate
• Microsoft 365 Certified: Enterprise Administrator Expert
• CompTIA Security+
• Microsoft Security Certifications
• ITIL Foundation, * Self-motivated and highly accountable
• Strong attention to detail with a security-first mindset
• Ability to prioritize and execute effectively in a fast-paced environment
• Strong organizational and documentation skills
• Effective communication and collaboration across technical and non-technical teams
• Demonstrated problem-solving ability and sound technical judgment
• Commitment to continuous learning and professional development

Pulled from the full job description

• AD&D insurance
• Health insurance
• 401(k) matching
• Paid time off
• Vision insurance
• Health savings account
• Dental insurance, * Robust employer contribution to employee medical benefits
• Competitive dental and vision insurance
• 401(k) plan with company match
• Wellness allowance to support employee well-being
• Life and AD&D insurance
• Disability insurance (short-term and long-term)
• Flexible Spending Accounts (FSA) & Health Savings Accounts (HSA)
• Flexible Paid Time Off to support work-life balance
• Employee Assistance Program (EAP)
• Perks at Work program offering discounts on products and services

Mission Critical Partners, LLC

Mission Critical Partners (MCP) is a leading provider of data, consulting, engineering, network and security solutions that are transforming segmented mission-critical networks and operations into interwoven ecosystems to improve response and justice outcomes in the communities and ever-expanding markets we serve. Through our breadth and depth of experience and an extensive network of resources, we are able to offer unique and successful solutions that help our clients improve technology and operations across a variety of industries ranging from public safety and justice to utilities, healthcare, and more. Additional information and career opportunities are available at MissionCriticalPartners.careers

Mission Critical Partners (MCP) is an Equal Opportunity/Affirmative Action Employer. We provide fair and equal employment opportunities to all qualified applicants, regardless of race, color, creed, religion, national origin, ancestry, citizenship status, age, sex or gender (including pregnancy, childbirth, pregnancy-related conditions, and lactation), gender identity or expression (including transgender status), sexual orientation, marital status, military service and veteran status, physical or mental disability, genetic information, or any other characteristic protected by applicable federal, state, or local laws and ordinances.