Senior Administrative Assistant

Quantum Management Services Ltd.; Toronto; Hybrid; CAD 70,000 - 85,000; Full time

Job summary

Quantum Management Services Ltd. is seeking a Senior Administrative Assistant to support a senior leader and the leadership team in Toronto. This role requires proactive ownership, strong organizational skills, and the ability to manage competing priorities in a fast-paced environment.

You will coordinate calendars and travel, prepare reports and presentations, and liaise with internal teams and vendors. The position offers hybrid work with in-office attendance Tuesday through Thursday.

Qualifications

• Several years of progressive administrative support experience, ideally within a project-based, professional services or corporate environment.
• Strong proficiency with Microsoft Office, particularly Excel, Word, PowerPoint and Outlook.
• Experience coordinating travel, expenses, meetings and business reporting.
• Sound judgment and confidence working with senior leaders.
• Resourceful, adaptable and comfortable working with limited direction.
• Receptive to constructive feedback and committed to producing high‑quality work.

Responsibilities

• Provide day-to-day administrative support to a senior leader and members of the leadership team.
• Coordinate calendars, meetings, travel arrangements and related logistics.
• Prepare, reconcile and submit expense reports.
• Assist with reports, presentations and other business documents.
• Coordinate office activities and deliveries to ensure the office runs smoothly.
• Liaise with internal teams, vendors and other contacts as required.
• Follow up on outstanding items and help ensure deadlines and commitments are met.

Skills

Microsoft Office

Excel

Word

PowerPoint

Outlook

Travel coordination

Expense reports

Senior leadership support

Job description

Position: Senior Administrative Assistant

Location: Toronto

Salary: $70,000-$85,000

Posting Type: Open vacancy

Work model: Hybrid, with in-office attendance Tuesday through Thursday

Our client is seeking an experienced and highly proactive Senior Administrative Assistant to support a busy senior leader and the broader leadership team while helping to keep the day-to-day operations of the office running smoothly.

This is an excellent opportunity for a confident administrative professional who enjoys taking ownership, anticipating needs and keeping a fast-moving team organized. The successful candidate will be comfortable working independently, managing competing priorities and supporting leaders who are frequently working outside the office.

Responsibilities

• Provide day-to-day administrative support to a senior leader and members of the leadership team
• Coordinate calendars, meetings, travel arrangements and related logistics
• Prepare, reconcile and submit expense reports
• Assist with reports, presentations, communications and other business documents
• Compile and organize information using Excel and other Microsoft Office applicationsCoordinate office activities, deliveries, requests and other operational details to ensure the office runs smoothly
• Liaise with internal teams, vendors and other contacts as required
• Follow up on outstanding items and help ensure deadlines and commitments are met

Qualifications

• Several years of progressive administrative support experience, ideally within a project-based, professional services or corporate environment
• Strong proficiency with Microsoft Office, particularly Excel, Word, PowerPoint and Outlook
• Experience coordinating travel, expenses, meetings and business reporting
• Sound judgment and confidence working with senior leaders
• Resourceful, adaptable and comfortable working with limited direction
• Receptive to constructive feedback and committed to producing high‑quality work

The Ideal Candidate

You are an experienced, polished and self‑directed administrative professional who does not wait to be told what needs attention. You quickly learn how a team and office operate, anticipate next steps and confidently take ownership of your responsibilities. You are comfortable supporting a smart, direct and fast‑paced leader and can adapt quickly as priorities change.

All applications are reviewed by our recruitment team, and hiring decisions are made by people. We may also use AI‑enabled tools to support parts of the application review process.

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