Senior Systems Administrator

Accountabilities: As a Senior Systems Administrator, you will manage daily infrastructure operations, strengthen security controls, and ensure the availability and performance of enterprise technology systems. Your responsibilities will include: Provide Tier 2 and Tier 3 technical support, serving as the primary escalation point for complex infrastructure, authentication, Microsoft 365, access management, and system-level issues. Troubleshoot and resolve advanced user, system, and performance problems across hybrid IT environments. Manage employee onboarding, offboarding, and lifecycle processes across identity systems, applications, and devices. Deploy, configure, and maintain hybrid server, storage, networking, and endpoint infrastructure across organizational locations. Configure and deploy applications using centralized management solutions such as Company Portal. Develop, maintain, and optimize automation scripts using PowerShell, Python, Bash, or similar technologies to streamline IT operations. Manage, monitor, and validate backup, restoration, and disaster recovery solutions across hybrid systems. Perform regular system updates, patch management, and security hardening activities to maintain stability and compliance. Support container deployments, updates, troubleshooting, and availability management. Lead infrastructure projects by translating business and technical requirements into effective solutions and coordinating implementation across teams. Implement, maintain, and continuously improve security policies and technical controls across cloud and on-premises environments. Conduct security assessments, vulnerability remediation, and compliance validation in collaboration with security and governance teams. Coordinate with security and incident response teams on investigations, containment activities, and forensic efforts. Implement and administer monitoring and observability solutions, including Azure Monitor and Zabbix. Configure alerts and notification mechanisms to identify infrastructure issues and performance degradation proactively. Analyze infrastructure performance metrics and implement optimization strategies to improve reliability, scalability, and efficiency. Troubleshoot complex system failures and coordinate resolution efforts with cross-functional teams. Maintain accurate technical documentation, architectural diagrams, and operational runbooks. Participate in all phases of the infrastructure lifecycle, including requirements gathering, design, deployment, testing, integration, cutover, and ongoing maintenance. Configure and deploy hardware, including servers, storage, networking equipment, and endpoint devices, to support operational and project requirements. Maintain the cybersecurity posture of assigned systems by implementing access controls, least-privilege principles, centralized authentication, and vendor-recommended security practices. Perform additional job-related responsibilities as assigned. Requirements The ideal candidate combines strong systems administration expertise with practical cybersecurity knowledge, automation capabilities, and excellent troubleshooting skills. You should demonstrate: Bachelor's degree in a related field or equivalent professional experience. At least 6 years of relevant systems administration experience. CompTIA Security+ CE certification or an equivalent qualification. Practical scripting experience with Python, PowerShell, Bash, or similar programming languages. Knowledge of at least five of the following technologies or technical areas: Windows Server 2019 and 2022. Windows 11. Ubuntu 22.04 LTS. iDRAC and iLO. Docker. Enterprise networking. Endpoint security. Vulnerability remediation. Knowledge of at least five of the following cloud technologies and services: Virtual Machines. Virtual WAN (vWAN), Virtual Hubs (vHub), Virtual Networks (VNet), subnets, Web Application Firewall (WAF), and Application Gateway. SharePoint. Exchange. Microsoft Entra ID. Azure Virtual Desktop. Azure Update Manager. Key Vaults, Storage Accounts, and Managed Identities. Strong analytical, troubleshooting, and problem-solving abilities. Excellent communication skills, with the ability to explain technical concepts to both technical and non-technical audiences. Ability to work effectively in fast-paced environments while managing multiple priorities. Strong attention to detail and a commitment to operational excellence. Preferred Qualifications: Familiarity with logging, monitoring, and observability tools such as Zabbix, Azure Monitor, and Log Analytics. Background in cybersecurity and compliance frameworks, including NIST SP 800-171, CMMC 2.0, NIST SP 800-53, and Risk Management Framework (RMF). Familiarity with secure configuration baselines and hardening standards such as DISA STIGs and CIS Benchmarks. Technical Environment: Cloud Platforms: Azure Government Cloud and Microsoft 365 GCC-High. Operating Systems: Linux (Ubuntu) and Windows Server. Automation Tools: Ansible, PowerShell, and Python. Monitoring Solutions: Azure Monitor, Grafana, and Zabbix. Containerization: Docker and Docker Compose. Scripting Languages: Python, PowerShell, and Bash. End-User Environment: Approximately 80 users. Additional Requirements: U.S. citizenship is required. Must be able to obtain and maintain a security clearance if necessary. Willingness to undertake up to 20% domestic travel. Ability to meet the physical requirements of the role, including occasionally lifting or moving equipment weighing up to 30 pounds. Reasonable accommodations are available for individuals with disabilities.