Senior Administrative Assistant

Responsibilities

The Senior Administrative Assistant provides comprehensive on-site support to senior leaders, including calendar management, document review, and travel coordination. They also oversee clerical functions, facilitate meetings, and handle tasks related to human resources, records management, and security.

Requirements

Candidates must possess a High School Diploma with 8+ years of experience or a Bachelor’s Degree with 2+ years of experience. An active TS/SCI with Polygraph security clearance is strictly required for this role.

Skills

• Microsoft Office
• Outlook
• MS Word
• Excel
• PowerPoint
• Calendar Management
• Typing
• Time-management
• Organizational skills
• Communication
• Team-building
• Critical Thinking
• Analytical skills
• Records Management
• Security functions

Benefits

• Health Insurance
• Life Insurance
• Paid Time Off
• Holiday Pay
• Short-term Disability
• Long-term Disability
• Retirement and Savings
• Learning and Development opportunities
• Wellness programs

About this role

DESCRIPTION & REQUIREMENTS

Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we’ve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now—unleash your potential with MANTECH!

MANTECH seeks a motivated, career, and customer-oriented Senior Administrative Assistant to join our team in Chantilly, VA area. The successful candidate will provide on-site administrative support to senior leaders.

Responsibilities include but are not limited to:

* Provide administrative support to Senior Leaders (to include: managing calendars, answering telephones, reviewing documents, making travel, responding to correspondence, and maintaining office staff phone contact lists)
* Oversees the administrative and clerical functions in support of the assigned team, contracts, projects, or tasks
* Schedule meetings and reserve conference rooms
* Attend and facilitate meetings, and capture meeting minutes (as directed)
* Performs other duties as assigned, such as Human Resources, Records Management, Facilities (to include escorting), and Security functions
* Provide coverage (as needed) across functional Administrative Team.
* Domestic travel up to 25%

Minimum Qualifications:

* High School Diploma and 8+ years of experience, or Bachelor’s Degree and 2+ years of experience.
* Demonstrated proficiency in Microsoft Office tools (to include: Outlook, MSWord, Excel, PowerPoint, etc.).
* Possess excellent organization and time-management skills
* Possess strong Typing Skills (50+ wpm).
* Ability to work independently on tasks (with minimal guidance).
* Have exceptional oral and written communication, organizational skills, and team-building skills.
* Experience working in fast-paced environments and working under quick timelines assisting multiple clients.

Preferred Qualifications:

* Demonstrate expert-level analytical and Critical Thinking Skills.
* Have strong interpersonal, people, and listening skills.
* Be responsive to tasking and able to work well independently and in groups.
* Previous NRO experience is highly desired.
* Experience with customer program eTrip

Security Clearance Requirement:

* Active/current TS/SCI with Polygraph is required.

Physical Requirements:

* Must be able to remain in a stationary position 50%
* Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.
* Frequently communicates with co-workers, management, and customers, which may involve delivering presentations

The projected compensation range for this position is $87,600.00-$145,700.00. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories.  In addition, MANTECH invests in its employees beyond just compensation.  MANTECH’s benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections.

MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.

GENERAL INFORMATION

Requisition #
R71955
Locations
USA-VA-Chantilly
Posting Date
11/09/2026
Security Clearance Required
TS/SCI w/ Poly
Remote Type
Onsite
Time Type
Full time

About MANTECH

IT System Data Services · 5,001-10,000 employees · headquartered in Herndon, Virginia · founded 1968