Administrative/Office Assistant

About Mianco Group Inc.

Mianco Group Inc. is a construction and environmental company with several active divisions operating across the GTA. Our head office in Stouffville is the hub of our operations, where a dedicated and tight-knit team keeps the business running smoothly.

As we continue to expand, we’re looking for a Full-Time Office Administrator who thrives in a fast-paced environment, can juggle multiple responsibilities, and is eager to contribute to a high-performance team.

About the Role

The Office Administrator plays a key role in ensuring day-to-day office operations run efficiently. You’ll be supporting not only the Office Manager but also other staff such as Project Managers, Dispatchers, and Operations Supervisors. This is an excellent opportunity for someone looking to grow into a more specialized administrative or leadership role over time.

Key Responsibilities

• General administrative duties including data entry, document management, filing, and correspondence
• Answer and direct phone calls and emails professionally
• Support the Office Manager with administrative workflows and office coordination
• Assist internal departments including operations, dispatch, and project management
• Help organize schedules, meetings, and project-related paperwork
• Maintain office supplies and keep workspace organized

What We’re Looking For

• Previous experience in an office administration role
• Strong organizational and multitasking skills
• Excellent communication skills (written and verbal)
• High attention to detail and ability to work independently
• Proficiency with Microsoft Office Suite and Google Workspace
• Ability to handle a fast-paced environment with shifting priorities

Why Join Mianco Group?

Supportive, team-based work cultureOpportunity to grow into a specialized admin or management roleExposure to multiple departments across a growing group of companiesFast-paced environment where your skills are put to use every day

How to Apply

Apply directly through Indeed with your resume. We thank all applicants for their interest—only those selected for an interview will be contacted.

Job Type: Full-time

Benefits

• Dental care
• Extended health care
• Vision care

Ability to commute/relocate:

• Stouffville, ON: reliably commute or plan to relocate before starting work (required)

Application question(s):

• Is relevant experience listed on your resume?

Education

• Secondary School (required)

Experience

• QuickBooks: 1 year (required)
• Basic Accounting: 1 year (required)
• receptionist: 1 year (preferred)
• administrative assistant: 1 year (required)

Language:

• Fluent English (required)

Work Location: In person