Sr. Systems Administrator

Job Description CSCI Consulting is seeking a Senior Systems Administrator to support the administration, maintenance, and optimization of a complex Infrastructure-as-a-Service (IaaS) environment. The Senior Systems Administrator will be responsible for ensuring the availability, security, performance, and reliability of Linux, Windows Server, VMware, and cloud-based infrastructure platforms. In this role, you will partner with infrastructure teams, enterprise architects, application support personnel, and business stakeholders to deliver scalable, secure, and highly available technology solutions while supporting operational excellence and continuous improvement initiatives. Responsibilities Administer and support enterprise infrastructure environments, including VMware virtual machines, Oracle Linux, and Microsoft Windows Server operating systems Troubleshoot and resolve complex server, infrastructure, and application issues independently and within established service level agreements Install, configure, maintain, and support Microsoft Active Directory Services infrastructure Manage and maintain Salesforce-related user accounts and access controls Monitor platform performance, capacity, utilization, and overall system health to maximize availability and reliability Administer DHCP, DNS, IIS, sFTP, and other critical infrastructure services Support and manage cloud-hosted and virtualized infrastructure environments Collaborate with Enterprise Architecture and cross-functional teams to design scalable, secure, and resilient infrastructure solutions Maintain server hardware and software inventories, configurations, and technical documentation Participate in database design, implementation, and support activities Implement and enforce security standards, policies, and procedures across infrastructure environments Manage Windows Server security configurations, vulnerability remediation, and patch management activities Provision and administer user accounts, credentials, permissions, and access controls Support web portals, middleware platforms, infrastructure applications, APIs, monitoring solutions, and network services Facilitate deployment of application updates, enhancements, and infrastructure changes across environments Develop recommendations for operational improvements and infrastructure optimization Support incident management activities, including root cause analysis and service restoration efforts Monitor, troubleshoot, and resolve backup failures and disaster recovery issues Respond to infrastructure monitoring alerts and performance concerns Manage and resolve customer support tickets, requests, and escalated technical issues Participate in an on-call rotation supporting critical business systems during evenings, weekends, and holidays Contribute to system architecture planning, infrastructure modernization, and cloud adoption initiatives Develop and maintain operational procedures, configuration standards, and disaster recovery documentation Minimum Requirements Bachelor’s degree in Computer Science, Information Technology, Engineering, or a related field, or equivalent combination of education, certifications, and experience 5+ years of experience administering and supporting enterprise server environments in production Strong experience with Oracle Linux and Microsoft Windows Server operating systems Experience administering and supporting VMware vSphere and virtualized infrastructure environments Strong knowledge of Microsoft Active Directory Services Working knowledge of SQL scripting and database concepts Experience supporting DHCP, DNS, IIS, sFTP, and related infrastructure services Knowledge of NAS and SAN storage technologies and connectivity concepts Understanding of domain and forest administration, networking fundamentals, and routing/switching concepts Experience with performance monitoring, tuning, capacity planning, and system optimization Basic to intermediate proficiency with shell scripting and automation Experience troubleshooting server, application, and infrastructure issues in production environments Ability to design, document, and support enterprise infrastructure solutions Strong analytical, troubleshooting, and problem-solving skills Ability to gather, interpret, document, and evaluate technical requirements Experience communicating technical solutions and recommendations to both technical and non-technical stakeholders Creativity and adaptability in problem-solving Ability to work with clients to understand their needs Strong organizational and time-management skills Excellent written and verbal communication skills Professional presence Preferred Skills Experience with VMware Site Recovery Manager (SRM), VMware Cloud Director, and VMware migration tools and methodologies Knowledge of Morpheus VM Essentials Experience supporting Infrastructure-as-a-Service (IaaS) environments Experience with public cloud platforms, including Microsoft Azure, AWS, Oracle Cloud Infrastructure (OCI), or Google Cloud Platform (GCP) Experience migrating applications and services to cloud environments Experience installing, configuring, and supporting CI/CD tools such as Jenkins and GitLab Knowledge of containerization technologies, including Docker Experience implementing and supporting analytics and reporting platforms such as Looker Intermediate proficiency with Python, Bash, or other scripting languages for automation and integration Experience with infrastructure automation and configuration management practices Knowledge of networking and cybersecurity principles Experience managing relationships with cloud providers and managed service vendors Experience working within an ITIL-based service management framework Understanding of disaster recovery, business continuity, and high-availability solutions Relevant Linux certifications such