Senior Systems Engineer
Location: Washington, DC
Company: Harmonia Holdings Group, LLC
Job Description Apply Now
Harmonia Holdings Group, LLC is an award-winning, rapidly growing federal government contractor committed to providing innovative, high-performing solutions to our government clients and focused on fostering a workplace that encourages growth, initiative, creativity, and employee satisfaction.
Description
Title: Senior Systems Engineer
Location: Washington, DC
Terms: Full-time
Clearance: Top Secret with SCI eligibility - Required
Travel: 10%
About the role
We are seeking a highly experienced and technically proficient Senior Systems 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.
What you’ll do
- 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.
Required Qualifications
- 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 Server administration
- 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.
- Experience with Active Directory in production environments.
Preferred Qualifications (nice-to-have)
- 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).
___________________________________________________________________________________________________________
Here at Harmonia we are pleased to have been repeatedly recognized for our outstanding work culture, the innovative work we do, and the employees on our team who make a difference each day. Some of these recognitions include:
- Recognized as a Top 20 "Best Place to Work in Virginia"
- Recipient of Department of Labor's HireVets Gold Medallion
- Great Place to Work Certification for five years running
- A Virginia Chamber of Commerce Fantastic 50 company
- A Northern Virginia Technology Council Tech 100 company
- Inc. 5000 list of fastest growing companies for eleven years
- Two-time SBA SBIR Tibbett's Award winner
- Virginia Values Veterans (V3) Certification
We recognize that every bit of our success is the result of our teams of hard-working, motivated, and innovative professionals who are proud to call themselves part of the Harmonia family! In addition to competitive compensation, a family-focused culture, and a dynamic, productive work environment, we offer all full-time employees a variety of benefits including, but not limited to
- 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!
Check out our , , and to find out a little more about who we are and if we are the right next step for your career!
Harmonia is an Equal Opportunity Employer providing equal employment opportunity to all employees and applicants for employment without regard to race, color, religion, national origin, age, gender, gender identity, sexual orientation, disability, or genetics. Harmonia does and will take affirmative action to employ and advance in employment individuals with disabilities and protected veterans. To perform the above job successfully, an individual must possess the knowledge, skills, and abilities listed; meet the education and work experience required; and must be able to perform each essential duty and responsibility satisfactorily. Other duties in addition to those listed may be assigned as necessary to meet business needs. Reasonable accommodation will be made to enable an applicant with a disability to successfully apply for and/or perform the essential duties of the job. If you are in need of an accommodation, please contact .