System Administrator II / System Administrator III - Hybrid - Chesterfield, MO (St. Louis)

System Administrator II / III – Hybrid – Chesterfield, MO (St. Louis) Location: 1 Headquarters, Experitec, Inc. St. Louis, MO Job Code: 791 # of Openings: 1 At Experitec, you will maintain and enhance enterprise infrastructure, serving as a senior technical resource, leading initiatives, and ensuring secure and reliable operations. What does a System Administrator do? Trusted technical resource and advanced escalation point for complex IT infrastructure issues across the organization. Administer and maintain Windows Server and Linux environments to ensure reliability and performance. Manage Active Directory, Azure Active Directory, and Office 365 with advanced policy and compliance configurations. Diagnose and resolve complex networking issues, including VPN, VLAN, subnetting, and firewall policies. Leverage virtualization platforms to deploy, manage, and decommission virtual servers. Write PowerShell scripts and automations to eliminate manual, repetitive tasks. Monitor system health, respond to alerts, and proactively maintain enterprise security and uptime. Bridge the technical gap between Tier 1/2 helpdesk and senior IT leadership. Mentor junior IT team members and contribute to technical documentation and SOPs. Participate in infrastructure upgrade, migration, and deployment projects. What You Will Contribute Advanced troubleshooting expertise as primary escalation point between Tier 1/2 support and senior IT staff. Hands‑on management of enterprise servers, storage (SAN/NAS), and virtualization platforms. Automation of routine processes using PowerShell, Bash, or similar scripting tools. Secure, reliable administration of cloud environments (Microsoft Azure) and on‑premises systems. Implementation of security best practices, vulnerability remediation, and patch management. Technical leadership on infrastructure projects, including migrations, upgrades, and deployments. High‑availability and disaster recovery testing to protect business continuity. Documentation of technical procedures and knowledge transfer to empower the broader IT team. Collaboration with network, security, cloud, and application teams on cross‑functional initiatives. Key Responsibilities Technical Support & Infrastructure Management Administer and maintain Windows and Linux server environments. Manage and support Active Directory, Group Policy, DNS, and DHCP. Design, implement, and maintain enterprise infrastructure solutions. Administer virtualization platforms. Manage cloud environments (Microsoft Azure). Configure and maintain backup, disaster recovery, and business continuity solutions. Monitor system performance, capacity, and availability while proactively identifying and mitigating risks. Handling Escalations and Root Cause Analysis Act as escalation point on complex tickets from Tier 1 and 2. Diagnose underlying root causes. Investigate deep system logs, network architecture, and application configurations. Bridge the IT gap to other business units. Lead root cause analysis efforts for critical incidents and recurring problems. Managing Infrastructure and High Availability Proactively monitor and optimize enterprise systems. Manage virtualized servers and configure network load balancing. Test disaster recovery and backup systems routinely to ensure maximum uptime. Support high‑availability and failover solutions for critical business systems. Perform capacity planning and infrastructure optimization to support business growth. Scripting and Automation Identify ways to eliminate repetitive and manual work. Write complex scripts, such as PowerShell, for Microsoft Entra environments. Automate routine diagnostics, patch management, desktop imaging, and application delivery. Develop and maintain automation scripts using PowerShell, Bash, Python, or similar tools. Security and Network Maintenance Implement and enforce overarching security strategies on the ground. Troubleshoot advanced connectivity issues and system outages. Audit directory structures and elevated permissions to maintain a secure environment. Implement security best practices, vulnerability remediation, and system hardening. Monitor and manage patching, updates, and lifecycle maintenance of infrastructure components. Ensure compliance with organizational policies, security requirements, and regulatory standards. Mentoring and Documentation Act as a technical leader and escalation point for the IT department. Mentor junior administrators, Tier 1 and Tier 2 Helpdesk, and analyze ticket escalation trends. Create technical documentation and standard operating procedures to empower lower tiers to solve problems independently. Evaluate new technologies and recommend infrastructure improvements. Required Skills, Experience & Abilities High School diploma or equivalent. Two or more years managing Windows Server in a production environment. Five or more years of IT experience. Three or more years as a System Administrator or equivalent. Experience deploying or managing virtual machines in VMware (vCenter or ESXi). Experience providing advanced technical support and serving as an escalation point for complex IT issues. Experience diagnosing and resolving server, operating system, storage, virtualization, and network‑related problems. Ability to proactively identify business needs, troubleshoot, and resolve technical issues through creative problem solving. Experience establishing project timelines and detailing key milestones and tasks to achieve objectives. Experience administering and maintaining Windows and Linux server environments. One or more years of experience managing and supporting Active Directory, Group Policy, DNS, or DHCP. Experience designing, implementing, and maintaining enterprise infrastructure solutions. Experience administering virtualization platforms. Experience configuring and maintaining backup, disaster recovery, and business continuity solutions. One or more years of experience monitoring system performance, capacity, and availability while proactively identifying and mitigating risks. Experience leading root cause analysis efforts for critical incidents and recurring problems. Experience implementing security best practices, vulnerability remediation, and system hardening. Experience monitoring and managing patching, updates, and lifecycle maintenance of infrastructure components. Experience developing and maintaining automation scripts using PowerShell, Bash, Python, or similar tools. Ability to create and maintain technical documentation, standards, and operating procedures. Experience planning and executing infrastructure upgrades, migrations, and deployment projects. Ability to collaborate with network, security, cloud, and application teams on cross‑functional initiatives. Ability to support enterprise storage systems, SAN/NAS technologies, and data management platforms. Ability to configure and maintain monitoring and alerting solutions. Ability to evaluate new technologies and recommend infrastructure improvements. Ability to ensure compliance with organizational policies, security requirements, and regulatory standards. Ability to support high‑availability and failover solutions for critical business systems. Ability to perform capacity planning and infrastructure optimization to support business growth. Ability to effectively communicate (written and verbal) with internal customers and co‑workers and to provide strong customer support through proactive solution development and time management. Ability to work Monday through Friday from 8 am – 5 pm in the office three days per week and work remote two days per week. The first 6–12 months will be five days in the office per week for training purposes. Ability to drive for the company with a valid driver’s license and the ability to pass driving record background check. Ability to utilize personal vehicle for the majority of work travel AND ability to rent a car when requested by supervisor for work travel. Ability to independently travel domestically up to 10% of the time, including overnights. Ability to lift more than 30 lbs. Comfort working with ambiguity, evolving projects, and leaders who think big and move fast. Ability to collaborate cross‑functionally and be comfortable with ambiguity and evolving IT environments. Ability to work independently while managing competing priorities. Preferred Skills, Experience & Abilities Bachelor’s degree in IT, Computer Science, or related field (or equivalent experience). Five or more years of experience in an MSP (Managed Service Provider) environment with broad exposure to multiple client environments. Microsoft certifications (e.g., Azure Administrator Associate, Microsoft 365 Certified: Enterprise Administrator Expert). CompTIA certifications (e.g., Security+, Network+, and/or Server+). ERP experience that is relevant to this position. Experience managing Microsoft Azure cloud environments. VMware and/or Hyper‑V virtualization certifications. Experience with identity and access management technologies (SAML, LDAP, OIDC, and/or SSO). Experience with SIEM tools and log management platforms. Familiarity with AI‑driven security tools for behavioral threat detection, automated incident response, and/or intelligent patch prioritization. Experience supporting enterprise AI integrations within Microsoft 365 environments, including Microsoft Copilot deployment and administration. Understanding of infrastructure requirements for AI and machine learning workloads, including compute, storage, and networking considerations. Experience using AI‑assisted scripting and development tools (e.g., Microsoft Copilot, GitHub Copilot) to accelerate automation and reduce manual effort. Familiarity with AI‑powered AIOps and monitoring platforms for proactive anomaly detection and automated infrastructure remediation. Possess comprehensive knowledge across key areas of IT: Hypervisor/Virtual servers, IT Infrastructure support, Office 365 Administration, and/or Microsoft Azure Administration. Experience in multiple AI environments. Hands‑on experience with an ERP in one or more functional areas (CRM, order management, manufacturing, inventory, service management, project management, finance, and/or HR). Benefits Package Employee Ownership – 100% Employee Owned. Opportunity to become an employee owner after meeting one year of service and 1000 hours. Employee Stock Ownership Plan (ESOP) encouraging and rewarding long term commitment following completion of plan requirements. Medical, accident/critical illness, dental, vision health plans, Health Savings Account, Flexible Spending Account, and Employee Assistance Programs. On‑the‑job training and coaching with opportunities to attend specific workshops to improve professional skills. Work Authorization Experitec does not provide immigration sponsorship (e.g., H‑1B visa sponsorship) or immigration support for F‑1 STEM OPT work authorization. Equal Opportunity Employer Experitec is an Equal Opportunity/Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to sex, race, color, religion, national origin, age, marital status, political affiliation, sexual orientation, gender identity, genetic information, disability, or protected veteran status. We are committed to providing a workplace free of any discrimination or harassment. #J-18808-Ljbffr International Executive Service Corps