Onsite Administrative Assistant & Office Coordinator

Midco; Sioux Falls (SD); On-site; USD 32,000 - 52,000; Full time

Benefits offered by this job

Free internet

401(k) match

Disability insurance

HSA contributions

Wellbeing programs

Community impact

Job summary

Midco in Sioux Falls is seeking an Administrative Assistant to be the first point of contact for visitors and partners, delivering a welcoming, organized office support. You will handle reception, scheduling, vendor liaison, and basic office operations to keep daily activities running smoothly.

The role requires MS 365 proficiency, strong communication, confidentiality, and the ability to balance multiple tasks in a fast-paced environment.

Qualifications

• High school diploma or equivalent (GED).
• Minimum of one year of experience supporting daily office operations, providing administrative assistance, or delivering professional, in-person customer service in a business environment.
• Proficiency with Microsoft 365 applications, including Outlook, Word, Excel, Teams, and PowerPoint.
• Strong verbal and written communication skills.
• Ability to maintain confidentiality and handle sensitive information with discretion.

Responsibilities

• Serve as Midco's first point of contact for visitors, team members, vendors, and external partners, providing a professional and welcoming experience in person and virtually.
• Manage incoming inquiries, ensuring timely, professional, and accurate responses.
• Greet, register, and assist visitors while maintaining building security and visitor access procedures.
• Provide administrative support to leaders and team members across the organization.
• Coordinate meetings, conference room scheduling, travel arrangements, and office events.
• Support team member engagement initiatives and workplace activities.
• Manage office supply inventory and purchasing.
• Coordinate office equipment checkout, tracking, and inventory management.
• Oversee incoming and outgoing mail, packages, and deliveries.
• Assist with pool vehicle fleet operations, including reservations, usage tracking, inspections, and check‑in/check‑out procedures.
• Support the distribution and tracking of Midco‑sponsored event tickets and support team member engagement initiatives.
• Process, code, and route invoices for approval and payment.
• Maintain organized filing systems, records, documentation, and administrative resources.
• Manage relationships with office vendors and service providers.
• Partner with Facilities and other internal teams to maintain clean, organized, safe, and functional office environments.
• Support office space assignments, moves, and workplace logistics as needed.
• Maintain conference rooms, common areas, and breakrooms to ensure a professional workplace experience.
• Model Midco’s mission, vision, values, ethos, and Leadership Success Drivers, and inspire others to do the same.
• Ensure customer privacy by adhering to Midco’s privacy guidelines while actively following Midco policies and procedures.
• Maintain reliable and predictable attendance as required by the position.
• Perform other duties as assigned.

Skills

Customer service

Communication

Organization

Confidentiality

Microsoft 365

Education

High School Diploma or GED

Tools

Microsoft 365

Job description

Midco in Sioux Falls is seeking an Administrative Assistant to be the first point of contact for visitors and partners, delivering a welcoming, organized office support. You will handle reception, scheduling, vendor liaison, and basic office operations to keep daily activities running smoothly.

The role requires MS 365 proficiency, strong communication, confidentiality, and the ability to balance multiple tasks in a fast-paced environment.