Administrative Assistant

Interstate Engineering; Mandan (ND); On-site; USD 40,000 - 50,000; Full time

Job summary

Interstate Engineering is seeking an Administrative Assistant to join our Mandan office. You will be the welcoming face, handle calls and schedules, and support engineers and staff with documents and project-related tasks.

We value initiative, organization, and a proactive attitude in a collaborative, employee-owned environment that supports growth and community service.

Qualifications

• 3–5 years of administrative or office support experience.
• Strong organisational and communication skills.
• Proficiency in Microsoft Office (Word, Excel, Outlook, PowerPoint).
• Associate's degree in Business Administration or related field is a plus.

Responsibilities

• Be the face of our office. Welcome visitors and provide a professional first impression.
• Coordinate schedules, organise meetings, manage correspondence, and keep employees productive.
• Assist engineers, surveyors, planners, and other professionals with documents, reports, and contracts.
• Take initiative to identify improvements and help the office run more efficiently.
• Support onboarding, office events, and day‑to‑day operations.

Skills

Excellent communication

Organizational skills

Time management

Initiative

Education

Associate's degree in Business Administration or related field

Tools

Microsoft Word

Microsoft Excel

Microsoft Outlook

PowerPoint

Job description

Job Description & Requirements

Be the welcoming face and helping hand behind a great team. Are you someone who enjoys connecting with people, takes pride in staying organised, and looks for ways to make things better? Do you thrive in an environment where every day brings something different?

Job Description & Requirements

Be the welcoming face and helping hand behind a great team. Are you someone who enjoys connecting with people, takes pride in staying organised, and looks for ways to make things better? Do you thrive in an environment where every day brings something different? Interstate Engineering is looking for an outgoing, motivated, and detail-oriented Administrative Assistant to join our Mandan office. We're looking for more than someone who can manage a calendar or answer the phone. We want someone who takes initiative, builds relationships, brings positive energy to the workplace, and sees opportunities to contribute without waiting to be asked. As an employee-owned company focused on growth, innovation, and serving communities, we value people who are excited to learn, take on new challenges, and grow alongside us.

What You'll Do

As an Administrative Assistant, you'll play an important role in keeping our Mandan office running smoothly while supporting employees, clients, and visitors.

Your Responsibilities Will Include

• Be the face of our office. Welcome visitors, answer calls, and create a friendly, professional first impression for everyone who walks through our doors.
• Keep things moving. Coordinate schedules, organise meetings, manage correspondence, and help employees stay organised and productive.
• Support our teams. Work alongside engineers, surveyors, planners, and other professionals to assist with documents, reports, contracts, and project‑related administrative tasks.
• Take ownership. Anticipate needs, identify opportunities for improvement, and take initiative to help the office operate more efficiently.
• Bring people together. Help coordinate office activities, company events, meetings, and new employee onboarding.
• Stay on top of the details. Maintain records, process invoices and expenses, assist with document management, and support day‑to‑day office operations.
• Keep learning. Build new skills, collaborate with employees across our offices, and explore opportunities to grow within the company.

What We're Looking For

The right person brings more than administrative experience. They bring the attitude, initiative, and willingness to contribute that make a great team even better.

You’ll Be a Great Fit If You

• Are naturally welcoming, approachable, and comfortable starting conversations with others.
• Take initiative and look for solutions instead of waiting for direction.
• Enjoy helping others and take pride in being someone your teammates can count on.
• Can juggle multiple priorities, stay organised, and follow through on commitments.
• Communicate confidently and professionally, both in person and in writing.
• Are adaptable, open to feedback, and excited to learn new things.
• Have a growth mindset and see challenges as opportunities to improve.
• Enjoy working collaboratively but are also comfortable managing responsibilities independently.

Preferred Qualifications

• 3–5 years of administrative or office support experience.
• Proficiency in Microsoft Office, including Word, Excel, Outlook, and PowerPoint.
• Strong organisational, communication, and time management skills.
• An associate's degree in Business Administration or a related field is a plus.

Why Interstate Engineering?

At Interstate Engineering, we're more than a team of engineers, surveyors, planners, and technical professionals. We're employee‑owners working together to deliver quality solutions that help communities thrive. We believe great ideas can come from anyone, and every role contributes to our success. We value people who are dependable, willing to help, eager to learn, and ready to make a difference. As our company continues to evolve, we want employees who are excited to grow with us, both personally and professionally.

This is an on‑site position in our Mandan office.

Being present, building relationships, and providing a welcoming experience for employees and visitors are essential parts of this role.

Ready to Make an Impact?

If you're the kind of person who sees something that needs to be done and takes action, enjoys being part of a team, and wants a position where your contributions matter, we'd love to meet you.