Posted 21 days ago
Senior Administrative Assistant
@ Doane Grant Thornton
Mississauga, Ontario
Overview
Doane Grant Thornton is hiring a Senior Administrative Assistant to support the External Client Services team and partners in its professional services firm. The role covers day-to-day administration, client data and billing support, and document preparation, and requires 3 to 5 years of professional services experience. The posting states a salary range of $54,000 to $70,800 in Mississauga and an in-office requirement of 5 days per week.
Responsibilities:
- Manage workflow and tasks for partners, practitioners and clients
- Enter and maintain client data and jobs in Microsoft Dynamics 365
- Provide billing support, invoicing and AR follow-up
- Prepare and edit correspondence, reports and proposals
- Handle calls, filing, scanning and secure client document transfer
Requirements summary:
- Minimum 3 to 5 years in professional services or similar
- Advanced skills in MS Word, Excel and PowerPoint
- CaseWare or Keystone knowledge an asset
- Excellent verbal and written communication
- Strong organization and time management under tight deadlines
- Available for overtime during peak periods
Tools & skills
Source and dates
Source type not verified · tbe
- Employer posting date
- 2026-10-16
- First seen by our source
- 2026-10-10
- Source record updated
- 2026-10-20
These dates describe the source record, not a live verification that the employer is still hiring. Check the original posting.
Job details
| Seniority | Senior |
| Department | Administrative |
| Experience | 3+ years |
| Hours per week | 40 (estimated) |
| Schedule | overtime |
| Work setting | Office |
| Position | Mostly sitting |
| Physical demands | physical low · computer high |
| Languages | English |
Summary and details written by AI from the posting; the employer’s posting is the authority.
Doane Grant Thornton
Saved company profile
Historical company information from a saved The Jobs API profile (LinkedIn/Crunchbase fields). It is not live-verified; figures may have changed. Missing values remain unknown.
Doane Grant Thornton is dedicated to helping our clients, colleagues, and communities thrive.
Full company description
In Canada. For Canada. Doane Grant Thornton LLP is a leading Canadian accounting and advisory firm dedicated to helping our clients, colleagues, and communities thrive. We help dynamic private and public organizations unlock their business potential by providing meaningful, strategic advice across a broad range of services, including assurance, advisory, and tax. For 85 years, we've worked alongside the businesses that have shaped our country and economy—from small businesses to industry leaders. With nearly 3,000 colleagues in 70 offices from St. John's to Victoria, we're deeply connected to the people, industries, and communities that make Canada thrive. Our unique, purpose-driven culture has resulted in consistent recognition as one of Canada’s Best Workplaces by the Great Place to Work® Institute since 2008. As bold leaders in our chosen markets and within the professional services industry, we're committed to our values of collaboration, leadership, excellence, agility, respect, and responsibility. Doane Grant Thornton LLP is a Canadian member of Grant Thornton International Ltd., whose member firms operate in over 100 countries worldwide.
- LinkedIn followers
- 64,983
- People associated on LinkedIn
- 2,915
- Reported office locations
- 200 King St W, 20th floor, Toronto, Ontario M5H 3T4, CA
- Business categories
- Consulting
- Business Development
- Financial Services
- Other recorded names
- Doane Grant Thornton
- Doane Grant Thornton LLP
- Profile identifies a recruitment agency
- No
- Reported total investment
- 0
Currency and observation date were not supplied; this is not a current valuation or a funding round.
In Canada. For Canada. Doane Grant Thornton LLP is a leading Canadian accounting and advisory firm dedicated to helping our clients, colleagues, and communities thrive. We help dynamic private and public organizations unlock their business potential by providing meaningful, strategic advice across a broad range of services, including assurance, advisory, and tax. For 85 years, we've worked alongside the businesses…
| Field | Value |
|---|---|
| Industry | Professional Services |
| Company size | 1,001-5,000 employees |
| Headquarters | Toronto, Ontario |
| Organization type | Partnership |
| Open jobs on Jobsy | 211 |
| View page |
Who we are
You know those big cities that still feel like small towns? Where everyone’s friendly and helps each other out? That’s like Doane Grant Thornton. Except here we’re all professionals and there isn’t a mayor or a general store. What we’re trying to say is that we’re a large and growing professional services firm that still feels like a community. We employ about 3000 people across Canada, and we truly care about our colleagues, our clients and the communities where we work and live. That’s what’s most important to us. We’re building a thriving organization that’s purpose driven and still want to remember what your favourite milkshake flavour is.
As a Senior Administrative Assistant your responsibilities will include:
• Ability to be proactive in managing workflow and tasks associated with the day-to-day needs of partners, practitioners and clients
• Working independently and within a team environment to support the External Client Services team within the Business Unit, Office and/or Service line to produce high quality client deliverables
• Entering and maintaining client data using Microsoft Dynamics 365 software, creating jobs in D365, rolling forward of jobs/files, and archiving as appropriate for the engagement
• General administrative duties including, but not limited to answering and transferring incoming calls, filing, photocopying, scanning, e-faxing, mailing and couriers
• Preparing and editing correspondence, reports, proposals and other documents
• Provide billing support using Doane Grant Thornton's systems and in accordance with the terms of the engagement including preparing invoices to clients, as well as following up on AR when appropriate
• Scanning documents and embedding in electronic file, sending and receiving documents electronically to clients through various secure file transfer platforms, ensuring confidentiality of sensitive information
• Managing communications, expense administration and travel arrangements on behalf of team leadership
• Supporting the Firm's professional image and culture by demonstrating professional behaviour and building positive professional relationships
• Other duties as required
Doane Grant Thornton
If you’re a bit like us, you’re driven to connect with how others are feeling and thinking. Here we walk in others shoes before taking action. Just imagine being part of a team that puts “we before me”, where flexAbility is a mindset, and where you trust your colleagues to have your back. At Doane Grant Thornton, you’ll work with inspiring leaders who support your development, both personally and professionally. This is a place where your insatiable curiosity enables you to think, see and hear from a variety of perspectives, a place where every day is different and having the courage to grow is part of who you are. And when all this comes together, well that’s when the magic happens!
Want to learn more about who we are and how we live our purple every day? Read our colleagues’ stories at www.discoveryourpurple.ca
Think you’ve got what it takes to be a Senior Administrative Assistant? Like the colour purple? Great. Here's a few more boxes we’re also hoping you can tick:
• Minimum of 3 to 5 years' experience within a professional services environment or similar industry
• Advanced strong knowledge of and experience working with MS Word, Excel, and PowerPoint
• Knowledge of CaseWare (and/or Keystone), experience in financial statement processing and experience with TaxPrep software or other similar programs would be an asset
• Excellent verbal and written communication skills
• Solid business acumen with strong interpersonal skills and demonstrated ability to build positive professional relationships
• Excellent organizational and time management skills, with the ability to manage competing priorities and work under pressure with multiple deadlines
• Strong attention to detail and consistent production of high quality work
• Ability to work effectively within tight timelines on simultaneous projects
• Availability to work overtime as required during peak business times
• Exceptional client service mindset with ability to de-escalate potentially difficult situations
At Doane Grant Thornton we’re focused on making a difference in the lives of our clients, our colleagues and our communities. That’s our purpose. Or, as we like to say, living our purple.
At Doane Grant Thornton, we believe compensation should reflect more than just market data—it should reflect you. We’re serious about compensation. We benchmark regularly across a wide spectrum of roles, industries, sectors, and levels to ensure our ranges are both competitive and current. But we don’t stop there. We also consider the unique strengths, experiences, and impact each individual brings to the table. Our salary ranges are reviewed annually, and where you land within the range depends on a mix of factors—your background, your skills, and how your contributions align with internal equity. To help start the conversation, the current salary range for this role is $54,000–$70,800 in Mississauga. If the role is available in other locations, the range may differ to reflect local market factors.
*This role is required to be in-office 5 days per week
Are you ready to Discover Your Purple?
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