Lead Exchange Engineer (Windows/AD) - Tier 3 (Enterprise Messaging)

Harmonia Holdings Group LLC
medical insurance, life insurance, vision insurance, parental leave, paid time off, paid holidays, 401(k)
United States, D.C., Washington
Sep 10, 2025
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. Lead Exchange Engineer (Windows/AD) - Tier 3 (Enterprise Messaging) Location:Washington, DC - 100% Onsite Clearance: Top Secret/SCI preferred About the role Harmonia is building a small, senior team to harden and modernize enterprise Windows/AD infrastructure for a major federal mission. You'll own core Windows/AD services, automation, and change operations; messaging/Exchange expertise is a strong plusand will be leveraged (or developed) as we improve availability and hybrid posture. What you'll do Own Windows Server/ADservices (GPO, DNS/DHCP, OU design, patching, monitoring) across production enclaves. Automate at scale with PowerShell; document runbooks and change procedures; participate in change windows/on-call. Troubleshoot complex infrastrucure issues end-to-end (networking/TLS/certs/identity). Contribute to Exchange 2016/2019operations (DAG health checks, CU planning, hybrid touchpoints) in partnership with a messaging SME. Required Qualifications Bachelor's in Computer Science, Information Technology, or related field - or equivalent practical experience. 10+ years of Windows Server administration and 4+ years of administering Active Directoryin production. Strong grasp of networking fundamentals(TCP/IP, DNS, DHCP, routing) and certificate/TLSmanagement. Proven PowerShell for administration/automation Microsoft Exchange Server 2016 and/or 2019 is preferred, but later version experience is acceptable. Excellent written and verbal communication. Ability to work100% onsite in Washington, DC; U.S. citizen. Preferred Qualifications (nice-to-have) Top Secret with SCI(active or crossover-eligible). Microsoft Exchange 2016/2019exposure: performance monitoring, CU/patchparticipation, upgrade planning, and advanced troubleshooting (mail flow, client connectivity, database/index health). Hybrid/M365 touchpoints:HCW, OAuth/Modern Auth, MRS/MRSProxy, and EOP/Defenderhygiene. Experience with load balancers(F5/NetScaler), PKI/certificatelifecycle, and enterprise monitoring (SCOM/M365 health sets). Azurebackground; Microsoft Azure certifications(e.g., AZ-104/AZ-305) preferred. Prior work in federalor classifiedenvironments (STIG/RMF/NIST). ___________________________________________________________________________________________________________ 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 ourLinkedIn,Facebook, andInstagramto 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 contactHR@harmonia.com.