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Administrative Assistant

Septagon Construction
Jefferson, MO Full Time
POSTED ON 12/11/2025 CLOSED ON 1/3/2026

What are the responsibilities and job description for the Administrative Assistant position at Septagon Construction?

Now Hiring: Administrative Assistant!

Join the Septagon team and help keep our office running smoothly!

We're looking for a detail-oriented, organized, and dependable Administrative Assistant to support daily operations and be a key resource for our division.

What You'll Do

  • Greet visitors, answer phones, and keep the office running efficiently
  • Maintain job files and assist with contract paperwork (lien waivers, insurance, invoicing)
  • Process A/P, A/R, purchase orders, and daily bank deposits
  • Assist with meetings, reports, presentations, and project tracking
  • Support Construction Managers with timesheets, MWRs, and documentation
  • Manage office supplies and serve as a communication link between staff, customers, and subcontractors
  • Handle confidential information with professionalism
  • Participate in weekly office meetings and occasional special projects

Why Septagon

  • Supportive team environment
  • Opportunity to contribute to meaningful projects
  • Professional office setting with room to learn and grow
  • EEO employer at-will employment

Working Conditions

  • Office-based with standard business hours, 8 am until 5 pm.
  • May occasionally work evenings or weekends for special projects.
  • Requires lifting up to 25 lbs (e.g., paper supplies).
  • Involves frequent computer and phone use.
  • High school diploma or equivalent; 2-4 years admin experience preferred
  • Strong organization, communication, and time-management skills
  • Positive attitude, willingness to learn, and ability to multitask
  • Team-oriented mindset and strong problem-solving skills
  • Must be 18 years old

Ready to join a fast-paced, people-focused team? Apply today!

Septagon is an equal opportunity employer.

Salary.com Estimation for Administrative Assistant in Jefferson, MO
$45,219 to $55,891
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