Senior Administrative Assistant — On-Site Leadership Support (TS/SCI)

MANTECH; Chantilly (VA); On-site; USD 65,000 - 90,000; Full time

Job summary

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

Responsibilities include managing calendars, coordinating travel, arranging meetings, taking minutes, and supporting HR, records, facilities, and security tasks.

Qualifications

• High School Diploma or Bachelor’s Degree with required experience.
• Proficient in Microsoft Office (Outlook, Word, Excel, PowerPoint).
• Strong organization and time-management skills.
• Typing speed 50+ wpm.
• Ability to work independently with minimal supervision.
• Excellent oral and written communication and teamwork.

Responsibilities

• Provide administrative support to Senior Leaders and staff.
• Manage calendars, travel arrangements, and correspondence.
• Schedule meetings and prepare minutes.
• Assist with HR, records, facilities, and security tasks as needed.
• Provide coverage across Administrative Team; travel up to 25%.

Skills

Microsoft Office

Typing 50+ wpm

Calendar management

Written and verbal communication

Time management

Independent work

Team collaboration

Education

High School Diploma or equivalent

Bachelor’s Degree (preferred)

Tools

MS Outlook

MS Word

MS Excel

MS PowerPoint

Job description

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

Responsibilities include managing calendars, coordinating travel, arranging meetings, taking minutes, and supporting HR, records, facilities, and security tasks.