SR System Administrator- DCGS Infrastructure

About the role

Systems Administrator, Senior – Full Time – Aberdeen Proving Ground, MD – Secret Clearance – Referral bonus: $1,500. Semper Valens Solutions, Inc. (SVS) is a Service-Disabled Veteran Owned Small Business (SDVOSB) providing Cost Effective Software and Systems Engineering, Field Support, Training and Full Life cycle Support Management to the DOD and VA community. At Semper Valens, our vision is to remain a creative, cutting edge and cost-effective solutions provider where our shared intellect, industry experience, and technology excellence, make a positive difference in our customer's success. Our solutions help bridge the gap between IT and business prioritizations to optimize budgets, risks and operational processes. We search for outstanding technical professionals, hiring at all levels of the experience spectrum; intermediate, journeyman and senior. Consider us for your career plan.

Responsibilities

• vSphere / ESXi Administration: Deep experience managing clusters, hosts, resource pools, DRS/HA, and VM lifecycle operations in enterprise environments.
• vCenter Operations: Skilled in configuring, monitoring, and optimizing vCenter, including performance tuning, capacity planning, and role‑based access control
• VMware Networking & Storage: Strong understanding of vSwitches, distributed switches, VLANs, iSCSI/NFS/FC storage, and datastore performance considerations.
• Cluster Design & Scaling: Ability to architect resilient, scalable clusters and optimize workloads for performance and availability.
• Performance Troubleshooting: Skilled at diagnosing CPU ready issues, memory ballooning, storage latency, and network bottlenecks using VMware tools and logs.
• Automation & Templates: Experience creating "gold" images, VM templates, and leveraging automation to standardize deployments.
• Hybrid Cloud Integration Concepts: Understanding of cloud landing zones, hybrid identity, network connectivity (VPN/ExpressRoute/Direct Connect), and workload migration patterns.
• Cloud Offerings: Knowledge of VMware Cloud options, AWS, Azure, or similar platforms to support cloud‑based vSphere integration
• Infrastructure as Code (IaC): Familiarity with Terraform, Ansible, or similar tools as environments move toward cloud‑native practices.
• Understanding how virtualization supports container platforms, DevOps pipelines, and modern application architectures.
• Strong grasp of routing, switching, firewalls, load balancers, DNS, DHCP, and how they interact with virtualized environments.
• Windows & Linux Administration: Skilled in patching, performance tuning, and troubleshooting across both OS families.
• Skilled at translating technical concepts for leadership, collaborating with security, networking, and application teams.
• Supporting junior admins, leading technical initiatives, and driving best practices across the team.

Requirements

• 5+ years of experience administering VMware ESXi, vCenter, and vSphere in enterprise environments.
• Strong knowledge of virtual networking, storage technologies, and performance troubleshooting.
• Experience