IT Infrastructure Manager - St. Louis - On-site

JOB SUMMARY:

The IT Infrastructure Manager oversees the design, reliability, security, and performance of the firm’s on-premises and cloud-based infrastructure environments. This role leads the strategic and operational management of core platforms—including networking, datacenter, identity, endpoint, and security technologies—while advancing the firm’s modern workplace capabilities within the Microsoft ecosystem. The position is responsible for implementing and maturing services across Entra , Intune, Microsoft Defender, and Microsoft Purview to support a secure, resilient, and well-governed technology posture.

This is a salaried position that typically operates Monday through Friday, with additional hours required as business or operational needs arise, including early mornings, evenings, or weekends.

• ESSENTIAL DUTIES AND RESPONSIBILITIES:
  
  Oversee the firm’s end-to-end infrastructure ecosystem, including enterprise networking (LAN/WAN, SD-WAN, segmentation, firewalls, switching), datacenter environments (compute, storage, VMware, SAN, backup/DR), and modernization initiatives such as Exchange and file share migrations.
• Lead identity and endpoint platforms using Microsoft Entra  Intune, including conditional access, MFA, privileged access, unified endpoint management, and device health/risk enforcement across corporate and BYOD devices.
• Manage security operations leveraging Microsoft Defender for Endpoint, Cloud Apps, and Office 365, partnering with SOC/MXDR teams to ensure continuous monitoring, incident response, threat containment, and DLP oversight.
• Direct data governance and compliance efforts through Microsoft Purview, implementing classification, labeling, DLP, eDiscovery, and governance policies while supporting DR/BCP testing and resiliency planning.
• Translate technology strategies into multi-phase roadmaps, manage vendors and MSSP partners, and coordinate with business and application teams on major projects, integrations, and upgrades.
• Build, mentor, and lead a high-performing infrastructure team, establish goals aligned to identity/endpoint/data governance initiatives, and provide clear communication and executive-level reporting on operational health, risks, and progress.
• Perform additional duties as needed.
• SUPERVISION RECEIVED AND EXERCISED:
  
  Works under general direction from the Chief Information Officer (CIO), with broad latitude for independent judgment and decision-making.
• Provides direct supervision, coaching, and performance management for infrastructure team members; may oversee contractors and third-party partners as required.
• EDUCATION AND EXPERIENCE REQUIREMENTS:
  
  7–10+ years of experience in infrastructure engineering or operations.
• 3–5+ years of experience in technical leadership or management roles.
• Hands-on experience with enterprise networking (routing, switching, firewalls, QoS), VMware virtualization, enterprise storage, and backup/DR solutions.
• Advanced proficiency with Microsoft Entra , Intune, Microsoft Defender (Endpoint, Cloud Apps, and Office), and Microsoft Purview.
• Demonstrated success in platform modernization projects (e.g., Exchange migrations, file share modernization) and hybrid cloud architectures.
• Strong familiarity with SOC operations and collaboration with MSSP/MXDR providers, including tuning detection and response workflows.
• Experience optimizing Microsoft E3/E5 licensing for security and compliance capabilities preferred.
• Familiarity with Sentinel/XDR integrations preferred.
• Background implementing governance frameworks and conducting DR/BCP exercises in professional services environments preferred.
• KNOWLEDGE, SKILLS, AND ABILITIES REQUIREMENTS:
  
  In-depth knowledge of enterprise networking, datacenter technologies, virtualization platforms, and cloud-based identity and security frameworks.
• Strong understanding of Microsoft 365 security, compliance, and identity services.
• Ability to architect and implement scalable, resilient, and secure infrastructure solutions.
• Excellent analytical and problem-solving abilities with a proactive mindset.
• Strong leadership, communication, and stakeholder engagement skills.
• Ability to manage multiple projects, priorities, and deadlines in a fast-paced environment.
• Commitment to continuous improvement and professional development.
• PHYSICAL DEMANDS Work occasionally requires a high level of mental effort and strain when performing essential duties and handling multiple requests in a timely and efficient manner.
• Work occasionally requires more than 40 hours per week to perform the essential duties of the position.
• Work takes place in normal office environment with little exposure to excessive noise, dust, temperature and the like.
• Ability to work outside normal business hours for planned maintenance, emergency response, or critical project deadlines.