Senior Systems Engineer

Harmonia Holdings Group, LLC•Washington, DC

68d•Onsite

About The Position

We are seeking a highly experienced and technically proficient Senior System Engineer to manage, optimize, and secure critical enterprise infrastructure at the Dept of State in Washington, DC. The ideal candidate will be a hands-on expert in Windows Server, Active Directory, and virtualization technologies, with a strong focus on automation and cloud adoption. This role requires deep technical troubleshooting skills and the ability to work in a secure, on-site environment.

Requirements

Active Top Secret with SCI(active or cross-over-eligible).
Bachelor’s in computer science, Information Technology, or related field — or equivalent practical experience.
10+ years of Windows Server administration
4+ years administering Active Directory in production environments.
Expert-level proficiency in PowerShell for complex administration, reporting, and automation.
Extensive experience with virtualization platforms (ESXi, Hyper-V, or KVM), including deployment, maintenance, and performance tuning.

Nice To Haves

Deep understanding of networking fundamentals (TCP/IP, DNS, DHCP, routing protocols) and experience with load balancers (e.g., F5/NetScaler).
Proven experience in designing and managing PKI and handling the entire certificate lifecycle.
Excellent written and verbal communication skills, with a proven ability to document complex systems.
Background in AWS and/or Azure infrastructure, services, and best practices.
Familiarity with security compliance frameworks and tools for federal/classified environments (STIG, RMF, NIST).
Experience with enterprise monitoring solutions (e.g., SCOM, Splunk, health sets).
Exposure to Microsoft 365 (M365) technologies, including Hybrid/M365 touchpoints (e.g., Modern Auth, EOP/Defender).

Responsibilities

Own Windows Server/Active Directory (AD) Services (GPO, DNS/DHCP, OU design, patching, monitoring) across production enclaves, ensuring high availability and optimal performance.
Design, implement, and manage enterprise virtualization platforms, primarily using VMware ESXi, for maximum efficiency and resource utilization.
Automate infrastructure deployment, configuration, and maintenance at scale using PowerShell and other scripting languages (e.g., Python), focusing on IaC (Infrastructure as Code) principles.
Architect, deploy, and manage Public Key Infrastructure (PKI) solutions and oversee certificate/TLS lifecycle management across the enterprise.
Perform complex, end-to-end troubleshooting of infrastructure issues, covering networking (TCP/IP, routing, load balancing), identity (Kerberos/LDAP), and application integration.
Document runbooks, standard operating procedures (SOPs), and change procedures; participate in scheduled change windows and on-call rotation.
Contribute to cloud strategy and migration efforts by providing technical expertise for AWS and/or Azure platform integration.
Ensure systems adhere to stringent security requirements (e.g., STIG/RMF/NIST), especially within federal or classified environments.

Benefits

Traditional and HSA- eligible medical insurance plans w/ Wellness Incentives for employees and family
100% employer-paid dental and vision insurance options
100% employer-sponsored STD, LTD, and life insurance
Veterans Cohort
Gym membership reimbursement
401(k) matching
Dollar-for-dollar 501(c)(3) donation matching
Flexible-schedules and teleworking options
Paid holidays and Flexible Paid Time Off
Adoption Expense Reimbursement
Paid Parental Leave
Professional development and career growth opportunities and paid training days
Employer-sponsored Employee Assistance Program for employee and family
Team and company-wide events, recognition, and appreciation-- and so much more!