Assistant Controller​/Assistant; te) Contrôleur

Position: Assistant Controller / Assistant(te) Contrôleur
Location: Montreal

(ENGLISH JOB POSTING - Le français s'ensuit) 21 TSI is rewriting the rules and shaping the future of the sports industry.

In just six years, we’ve launched Maddle, Montreal Weights, Ascend, and Nordik Recovery, and fulfilled over 150,000 orders across Canada. Today, our growth is accelerating, and we are preparing to expand across North America and beyond.

To support our continued growth, we are looking for a hands‑on, analytical, and detail‑oriented Assistant Controller who can take ownership of day‑to‑day accounting operations and help maintain accurate, reliable financial information.

Reporting to the Director of Finance, you will support daily accounting operations, month‑end closing, reconciliations, and the continuous improvement of financial processes. You should be comfortable working independently, investigating discrepancies, and following issues through to resolution.

Key Responsibilities
Day-to-Day Accounting

• Ensure the accurate, complete, and proper recording and classification of financial and accounting transactions across all company entities
• Follow up on and validate accounting transactions in collaboration with the Accounts Payable Technician and various departments
• Prepare bank and credit card reconciliations and investigate variances
• Prepare and manage quotes, invoicing, and collections for B2B sales in collaboration with the Customer Service team
• Review inventory transactions, validate SKU costs, and assist with inventory reconciliations
• Reconcile general ledger accounts, maintain supporting schedules, and resolve discrepancies ahead of month‑end close

Financial Reporting & Compliance

• Reconcile sales and payment transactions from various sales platforms and payment gateways (Shopify, Amazon, Pay Pal, affirm, etc.)
• Prepare and validate GST/QST reports
• Reconcile intercompany balances and transactions between the company’s various entities
• Actively participate in the monthly, quarterly, and annual accounting close processes

Budgeting & Audit

• Participate in the preparation of annual budgets and financial forecasts.
• Support the Director of Finance with year‑end audit schedules, reconciliations, and supporting documentation.

Cross-Department Collaboration and General Support

• Collaborate with Operations, Customer Service, and other departments to resolve accounting issues and improve data accuracy.
• Identify opportunities to streamline recurring accounting tasks and improve financial processes and systems.

What we’re looking for

• 3–5 years of relevant hands‑on accounting experience, preferably in a product-based, distribution, retail, or e‑commerce environment.
• A college diploma (DEC), bachelor’s degree in accounting or finance, or equivalent relevant experience. Practical accounting ability and autonomy matter more than a specific designation.
• Advanced skills in Microsoft Excel & Google Sheets.
• Experience with an ERP system and strong technological aptitude;
  Net Suite experience is an asset.
• Familiarity with Quick Books Online, Dext, and other cloud-based accounting applications is an asset.
• Ability to handle high transaction volumes, investigate issues independently, and follow them through to resolution.
• Strong analytical and reconciliation skills, with a structured, methodical, and detail-oriented approach.
• Excellent communication and priority management skills.
• Understanding and ease with technological tools.
• Good organization and ability to effectively manage recurring tasks.
• Proactive, adaptable, and comfortable navigating changing processes and priorities in a fast‑growing environment.
• Bilingualism (English and French) is required to communicate effectively with our internal and external partners.

What we offer

• Salary offer:
  Competitive and market-based compensation reflective of your skills and…