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Leffler Consulting
Leffler Consulting
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Gaithersburg, MD
Washington, DC
Fairfax, VA
Arlington, VA
Chantilly, VA
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Secretaries and Administrative Assistants, Except Legal, Medical, and Executive
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Administrative Management and General Management Consulting Services
Space Research and Technology
National Security
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Leffler Consulting
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Model Based System Engineer – TS/SCI Clearance w/CI Poly
NEXT STEPS
Leffler Consulting
Gaithersburg, MD
L6 Lead
April 12th, 2026
Engineers, All Other
Engineering Services
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Ground Systems Integration Engineer (GSIE)/TS/SCI Clearance w/CI Poly
NEXT STEPS
Leffler Consulting
Gaithersburg, MD
L6 Lead
April 12th, 2026
Computer Systems Engineers/Architects
Engineering Services
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EVM Analyst - CI Polygraph required
APPLY
Leffler Consulting
Gaithersburg, MD
L5 Senior
August 9th, 2026
Management Analysts
Other Scientific and Technical Consulting Services
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Senior Budget Analyst - CI Polygraph REQUIRED
APPLY
Leffler Consulting
Gaithersburg, MD
L5 Senior
August 9th, 2026
Budget Analysts
Other General Government Support
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FIAR Consultant - Secret Clearance
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Leffler Consulting
Chantilly, VA
L6 Lead
August 9th, 2026
Accountants and Auditors
Other Management Consulting Services
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Senior Tableau Developer - TS/SCI Clearance with CI Polygraph required
APPLY
Leffler Consulting
Gaithersburg, MD
L5 Senior
August 9th, 2026
Business Intelligence Analysts
Other Scientific and Technical Consulting Services
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Cost Analyst – TS/SCI Clearance w/CI Poly
NEXT STEPS
Leffler Consulting
Gaithersburg, MD
L3 Junior
April 12th, 2026
Cost Estimators
Other Scientific and Technical Consulting Services
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Cleared Budget Analyst | TS/SCI, PPBE Specialist
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Leffler Consulting
Arlington, VA
L4 Mid
June 7th, 2026
Budget Analysts
Other General Government Support
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Cost Analyst - TS/SCI Clearance w/CI Poly
NEXT STEPS
Leffler Consulting
Chantilly, VA
L3 Junior
June 22nd, 2026
Cost Estimators
Space Research and Technology
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Administrative Assistant - TS/SCI with CI Polygraph required
APPLY
Leffler Consulting
Gaithersburg, MD
L3 Junior
August 11th, 2026
Secretaries and Administrative Assistants, Except Legal, Medical, and Executive
Administrative Management and General Management Consulting Services
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Space Systems Cost Analyst TS/SCI w/ Poly
NEXT STEPS
Leffler Consulting
Chantilly, VA
L3 Junior
June 22nd, 2026
Cost Estimators
Space Research and Technology
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Senior Cost Engineer/Estimator (TS/SCI Clearance w/CI Poly Required)
NEXT STEPS
Leffler Consulting
Chantilly, VA
L5 Senior
June 25th, 2026
Cost Estimators
Space Research and Technology
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Acquisition Support Engineer - TS/SCI Clearance w/CI Poly
NEXT STEPS
Leffler Consulting
Chantilly, VA
L6 Lead
June 26th, 2026
Purchasing Agents, Except Wholesale, Retail, and Farm Products
Space Research and Technology
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Senior Program Control Analyst - TS/SCI Clearance w/CI Poly
NEXT STEPS
Leffler Consulting
Chantilly, VA
L5 Senior
July 4th, 2026
Budget Analysts
Other General Government Support
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Spacecraft Attitude Control Systems Engineer – TS/SCI Clearance w/CI Poly
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Leffler Consulting
Gaithersburg, MD
L6 Lead
August 5th, 2026
Aerospace Engineers
Space Research and Technology
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Acquisition Support Engineer – TS/SCI Clearance w/CI Poly
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Leffler Consulting
Gaithersburg, MD
L6 Lead
August 5th, 2026
Purchasing Agents, Except Wholesale, Retail, and Farm Products
Engineering Services
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Property Administrator - TS/SCI Required
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Leffler Consulting
Washington, DC
L5 Senior
August 5th, 2026
Property, Real Estate, and Community Association Managers
Nonresidential Property Managers
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Action Officer - TS/SCI Clearance with CI Polygraph required
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Leffler Consulting
Gaithersburg, MD
L5 Senior
August 5th, 2026
Business Operations Specialists, All Other
Other Scientific and Technical Consulting Services
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Budget Development Analyst SME – TS/SCI Clearance w/CI Poly
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Leffler Consulting
Gaithersburg, MD
L5 Senior
July 18th, 2026
Budget Analysts
Administrative Management and General Management Consulting Services
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Schedule Analyst - TS/SCI with CI Polygraph
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Leffler Consulting
Gaithersburg, MD
L3 Junior
August 27th, 2026
Project Management Specialists
Other Scientific and Technical Consulting Services
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Scheduler - TS/SCI
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Leffler Consulting
Gaithersburg, MD
L4 Mid
August 4th, 2026
Project Management Specialists
Other Scientific and Technical Consulting Services
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Resource Analyst - TS/SCI with CI Polygraph required
APPLY
Leffler Consulting
Gaithersburg, MD
L5 Senior
August 4th, 2026
Management Analysts
Other Scientific and Technical Consulting Services
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Administrative Assistant – TS/SCI Clearance
APPLY
Leffler Consulting
Arlington, VA
L4 Mid
July 27th, 2026
Secretaries and Administrative Assistants, Except Legal, Medical, and Executive
Administrative Management and General Management Consulting Services
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Senior Audit Manager - TS/SCI REQUIRED
APPLY
Leffler Consulting
Fairfax, VA
L6 Lead
August 6th, 2026
Accountants and Auditors
Administrative Management and General Management Consulting Services
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Senior Budget Analyst - TSSCI Required
APPLY
Leffler Consulting
Arlington, VA
L5 Senior
August 6th, 2026
Budget Analysts
National Security
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Spacecraft Ground Systems Engineer - CI Polygraph required
APPLY
Leffler Consulting
Gaithersburg, MD
L6 Lead
August 6th, 2026
Project Management Specialists
Space Research and Technology
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Budget Analyst - TS/SCI required
APPLY
Leffler Consulting
Gaithersburg, MD
L5 Senior
August 6th, 2026
Budget Analysts
Administrative Management and General Management Consulting Services
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Senior Software Developer - Secret Clearance required
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Leffler Consulting
Reston, VA
L6 Lead
August 6th, 2026
Software Developers
Custom Computer Programming Services
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Senior Data Scientist - TS/SCI Clearance with C.I. Polygraph required
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Leffler Consulting
Gaithersburg, MD
L5 Senior
August 6th, 2026
Data Scientists
Other Scientific and Technical Consulting Services
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Human Resources Specialist - CI Polygraph required
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Leffler Consulting
Gaithersburg, MD
L5 Senior
August 10th, 2026
Human Resources Specialists
Administrative Management and General Management Consulting Services
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Contract Administrator - TS/SCI Clearance with CI Polygraph REQUIRED
APPLY
Leffler Consulting
Gaithersburg, MD
L5 Senior
August 10th, 2026
Secretaries and Administrative Assistants, Except Legal, Medical, and Executive
Administrative Management and General Management Consulting Services
Show all >
Ground Systems Integration Engineer - TS/SCI with CI Polygraph
APPLY
Leffler Consulting
Gaithersburg, MD
L6 Lead
August 11th, 2026
Computer Systems Engineers/Architects
Space Research and Technology
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Junior Financial Analyst - TS/SCI Clearance required
APPLY
Leffler Consulting
Fairfax, VA
L4 Mid
August 11th, 2026
Accountants and Auditors
Other Management Consulting Services
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Administrative Assistant/Legal Secretary
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Leffler Consulting
Gaithersburg, MD
L3 Junior
August 22nd, 2026
Secretaries and Administrative Assistants, Except Legal, Medical, and Executive
Other Scientific and Technical Consulting Services
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Staff Accountant - Secret Clearance required
APPLY
Leffler Consulting
Washington, DC
L6 Lead
August 22nd, 2026
Accountants and Auditors
National Security
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Budget Analyst - TS/SCI clearance required
APPLY
Leffler Consulting
Arlington, VA
L5 Senior
August 19th, 2026
Budget Analysts
National Security
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Contract Administrator - TS/SCI with CI Polygraph required
APPLY
Leffler Consulting
Chantilly, VA
L5 Senior
August 4th, 2026
Purchasing Agents, Except Wholesale, Retail, and Farm Products
Administrative Management and General Management Consulting Services
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Senior Software Developer - Secret Clearance required
APPLY
Leffler Consulting
East Andover, NH
L6 Lead
August 31st, 2026
Software Developers
Custom Computer Programming Services
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Test Engineer Principal – TS/SCI Clearance w/CI Poly
NEXT STEPS
Leffler Consulting
Gaithersburg, MD
L6 Lead
April 12th, 2026
Software Quality Assurance Analysts and Testers
Engineering Services
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Senior Budget Analyst (SME) – TS/SCI Clearance
NEXT STEPS
Leffler Consulting
Washington, DC
L5 Senior
April 12th, 2026
Budget Analysts
National Security
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