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Office Administrator

Job in Mississauga, Ontario, Canada
Listing for: Trillium Guideway Partners
Full Time position
Listed on 2026-06-23
Job specializations:
  • Administrative/Clerical
    Office Administrator/ Coordinator, Admin Assistant, Executive Admin/ Personal Assistant, Office Assistant
Job Description & How to Apply Below

Who we are?

The Primary Construction Team consists of ACCIONA Infrastructure Canada Inc. (ACCIONA) and Amico Major Projects Inc. (Amico), as Trillium Guideway Partners (TGP).

What is the project?

The Ontario Line (“OL”) is a fully integrated, stand-alone, rapid transit system that connects Ontario Science Centre to the Exhibition and Ontario Place grounds. The Northern Civil, Stations and Tunnel (“NC”) project consists of approximately 7 kms of underground subway and elevated guideway, with stations along the segment providing connections to surface bus and streetcar routes. The NC project has been divided into two main progressive design-build contracts: (1) the Elevated Guideways and Stations Contract (“EGS”) and the Pape Tunnel and Underground Station Contract (“PTUS”), with supporting Early Works.

What is the Opportunity?

The Office Administrator supports the daily administrative and operational functions of the office and project sites. This role is responsible for coordinating office services, supplies, facilities requests, onboarding logistics, meeting coordination, vendor communication, and general administrative support to ensure smooth day-to-day operations.

The successful candidate is organized, proactive, detail-oriented, and comfortable working in a fast-paced project environment while supporting multiple teams and office locations.

Responsibilities

Office Administration & Operations

• Responsible for daily office operations and maintaining organized common areas and meeting rooms.

• Coordinate office supplies, kitchen inventory, stationery, and vendor orders.

• Support onboarding logistics including desk setup, welcome materials, office orientation, access cards, and parking access coordination.

• Assist with employee inquiries as required.

Facilities & Administrative Coordination

• Coordinate maintenance requests and follow up with building management and vendors.

• Track office-related expenses, invoices, and purchase requests.

• Maintain organized digital and physical records related to office operations.

• Support multiple office and satellite locations as needed.

You’ll bring to the Team (Knowledge, Skills, Competencies)

• High school diploma required; post-secondary education in administration, business, hospitality, or a related field is considered an asset.

• 1–2 years of experience in an administrative or office support role required; experience in the construction industry is considered an asset.

• Strong communication and interpersonal skills with a customer-service mindset.

• Proficiency in Microsoft Office Suite (Outlook, Excel, Word, PowerPoint).

Please note that only candidates that meet requirements will be contacted.

We do not accept unsolicited agency resumes.

We are committed to creating an accessible and barrier‑free recruitment process and workplace. If you need any accomodation throught the process, please email

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