Senior Systems Engineer - TS/SCI Eligible, Enterprise Infra

99999 Consulting LLC; Washington (District of Columbia); On-site; USD 180,000 - 255,000; Full time

Benefits offered by this job

Medical

Dental

Vision

Retirement

Job summary

99999 Consulting LLC in Washington, DC is seeking a senior systems engineer to design, deploy, and operate enterprise Windows infrastructure, AD, PKI, and security-focused identity systems. The role includes Linux tasks and container workloads using Kubernetes and Docker in hybrid environments.

Applicants should have 8+ years in secure/cleared environments and hold active TS clearance or be eligible to obtain TS/SCI.

Qualifications

• 8+ years systems engineering experience in secure/cleared environments.
• Active TS; must be able to obtain TS/SCI
• Demonstrated experience with progressive responsibilities indicative of a senior engineer.

Responsibilities

• Design, deploy, maintain, and troubleshoot enterprise Windows infrastructure (Active Directory, Group Policy, PKI, etc.).
• Manage identity and access systems, certificate authorities, and PKI infrastructure.
• Depending on specializations: Linux systems, containerized workloads (Kubernetes, Docker).
• Collaborate with cross-functional teams on architecture, security, and operational improvements.
• Lead root cause analysis for system outages or performance issues.
• Mentor less‑senior engineers and technicians.
• Deep expertise in Microsoft Core On‑prem technologies (Windows Server, AD, Exchange, PKI, Group Policy).
• Experience with Linux server management, scripting/automation.
• Familiarity with container orchestration (Kubernetes, Docker) in hybrid environments.
• Security, networking, monitoring, and backup/DR integration relevant to enterprise infrastructure.

Skills

Active Directory

Group Policy

PKI

Linux systems

Kubernetes

Docker

Scripting/automation

Security engineering

Monitoring

Backup/DR

Tools

Windows Server

Exchange

Certificate Authority

Job description

99999 Consulting LLC in Washington, DC is seeking a senior systems engineer to design, deploy, and operate enterprise Windows infrastructure, AD, PKI, and security-focused identity systems. The role includes Linux tasks and container workloads using Kubernetes and Docker in hybrid environments.

Applicants should have 8+ years in secure/cleared environments and hold active TS clearance or be eligible to obtain TS/SCI.