Job Description

This Network Engineer is responsible for the architecture, deployment, and optimization of high-performance data center networks. This role bridges the gap between traditional enterprise networking and innovative High-Performance Computing (HPC) environments. You will be the primary authority on low-latency fabrics, managing the physical and logical pathways that power large-scale virtualization clusters and AI/ML workloads. The ideal candidate treats the network as a high-speed highway, ensuring zero-packet-loss delivery for data-intensive applications.

Responsibilities

• Design and maintain Cisco ACI (Application Centric Infrastructure) environments, including Multi-Pod and Multi-Site connectivity.
• Deploy and tune InfiniBand (Subnet Managers, Leaf/Spine topology) and RoCEv2 (RDMA over Converged Ethernet) to support low-latency requirements.
• Configure and troubleshoot complex BGP, OSPF, and EVPN-VXLAN deployments across a multi-vendor landscape.
• Optimize Quality of Service (QoS) and Priority Flow Control (PFC) to prevent congestion in RDMA-heavy environments.
• Collaborate with systems teams to integrate networking with VMware NSX, KVM, or Hyper-V, ensuring seamless East-West traffic flow.
• Analyze telemetry data to forecast bandwidth needs for massive data ingest and high-speed storage arrays (NVMe-oF).

At COLSA, people are our most valuable resource and centered at our core value. We invite you to unite your talents with opportunity and be a part of our “Family of Professionals! Learn about our employee-centric culture and benefits here: https://www.colsa.com/culture_benefits/

Required Qualifications

• Bachelors Degree in computer science or related field or equivalent experience
• Minimum of 1 to 15 years of related experience
• Enterprise/Data Center networking with a focus on spine-leaf architectures
• Proficiency with high-density switching platforms (e.g., Cisco Nexus, Arista, or NVIDIA).
• Active/Current CompTIA Security+ CE, ISC2 SSCP, or equivalent baseline certification
• Ability to obtain Special Access Program (SAP) eligibility and maintain program access as required
• U.S. Citizenship required; Must possess (or be able to obtain and maintain) a DoD Top Secret clearance with SCI eligibility including successful completion of a Counterintelligence (CI) Polygraph within 180 days of start date

Preferred Qualifications

• Enterprise/Data Center networking with a focus on spine-leaf architectures.
• Active DoD Top Secret Clearance with SCI and a Counterintelligence (CI) Polygraph with willingness to meet Special Access Program (SAP) eligibility requirements
• CCNA Routing & Switching or higher, Nivida Networking, etc.
• Demonstrated experience with HPC Clusters.
• Knowledge of NVMe over Fabrics (NVMe-oF) and Fiber Channel over Ethernet (FCoE)
• Ability to manage network state using Ansible, Terraform, or Python (Netmiko/NAPALM).
• Direct experience implementing RoCEv2 in a Lossless Ethernet environment using DCB/PFC.
• Nutanix, KVM, Citrix, or similar.

Applicant selected will be subject to a government security investigation and must meet eligibility requirements for access to classified information. COLSA Corporation is an Equal Opportunity Employer, Minorities/Females/Veterans/Disabled. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, or national origin.