Senior Accounts Payable Administrator - Mississauga (Skymark)

Avanti Software Inc.; Mississauga; On-site; CAD 66,000 - 70,000; Full time

Job summary

Ontario Medical Supply, Mississauga, is seeking a Senior Accounts Payable Administrator to lead high-volume, full-cycle AP activities across invoice-to-payment. You will ensure accurate payments, month-end close, reconciliations, and internal controls.

This role demands advanced AP knowledge, ERP experience, and the ability to train and mentor junior AP staff. Strong Excel and vendor-management skills are essential to support audits and process improvements.

Qualifications

• Minimum five years of progressive accounts payable experience, including leadership exposure.
• Advanced knowledge of full-cycle accounts payable, three-way matching, vendor master-data governance, and reconciliations.
• Experience in a high-volume, multi-entity environment; strong internal controls and audit familiarity.

Responsibilities

• Manage high-volume, full-cycle accounts payable, including invoice receipt, coding, three-way matching, verification, approval, and payment processing.
• Coordinate and validate payment runs (EFTs, wires, cheques) with proper approvals and documentation.
• Reconcile vendor statements and AP accounts; investigate discrepancies and vendor inquiries.
• Lead AP month-end and year-end close activities and prepare aging analyses.
• Support audits with documentation and respond to information requests.
• Identify and implement AP process improvements and automation; assist with system implementations and testing.
• Provide training and day-to-day guidance to junior AP staff.
• Collaborate with Procurement, Finance, and Operations to resolve payment issues.

Skills

AP knowledge

Vendor management

Process improvement

Analytical skills

Communication

Tools

Advanced Excel

ERP systems

Procure-to-Pay

Job description

Senior Accounts Payable Administrator - Mississauga (Skymark)

Our Mission:

Ontario Medical Supply is a Leading Distributor of medical equipment, supplies, and services for healthcare organizations and home healthcare clients across Ontario. Specializing in long term care, assisted living, retirement and home health care. Ontario Medical Supply is partnered for success with Royal Drugs. Royal Drugs is a healthcare company providing specialty pharmacy, infusion therapy, and retail pharmacy services. Together, we work towards supporting optimal health outcomes and better quality of life. Come Join Our Team!

Purpose:

The Senior Accounts Payable Administrator leads complex, high-volume accounts payable activities across the full invoice-to-payment cycle. The role applies advanced AP knowledge to support accurate payments, month-end close, reconciliations, controls, audits, vendor issue resolution, process improvement, and the development of junior team members.

Job Title: Senior Accounts Payable
Location: Ontario Medical Supply, Mississauga (2785 Skymark Avenue, Unit 2 Mississauga, ON L4W 4Y3)
Number of Positions: 1
ATR: #5211
Salary: $65,798 - $70,000/year
Type: Full-time, Permanent

This job posting is for an existing vacancy

Job Responsibilities:

• Manage high-volume, full-cycle accounts payable, including invoice receipt, coding, three-way matching, verification, approval, and payment processing.
• Review invoices for accuracy, appropriate documentation, purchase orders, and compliance with company policies.
• Coordinate and validate payment runs, including EFTs, wires, cheques, and other payment methods, ensuring appropriate approvals, segregation of duties, and complete supporting documentation.
• Reconcile vendor statements and AP accounts; investigate and resolve discrepancies, duplicate payments, unapplied credits, aged items, and vendor inquiries.
• Respond to vendor inquiries and resolve payment-related issues in a timely and professional manner.
• Lead AP month-end and year-end close activities, including subledger-to-general-ledger reconciliation, AP aging analysis, accrual support, cut-off review, and investigation of reconciling items.
• Prepare AP aging reports and analyze outstanding balances and payment requirements.
• Assist with cash flow forecasting and provide payment information to the Finance team.
• Monitor and maintain AP controls to ensure compliance with company policies and accounting procedures.
• Support internal and external audits by providing documentation and responding to information requests.
• Identify, document, and implement AP process and system improvements that strengthen controls, increase automation, reduce cycle times, and improve accuracy.
• Assist with system implementations, testing, and process enhancements.
• Provide training, guidance, and day-to-day support to junior AP administrators.
• Collaborate with Procurement, Finance, Operations, and other departments to resolve invoice and payment issues.
• Maintain organized and accurate electronic records and documentation.

Qualifications:

• Minimum five years of progressive accounts payable experience, including at least two years managing complex AP activities in a senior, lead, or subject-matter-expert capacity.
• Advanced knowledge of full-cycle accounts payable, including purchase-to-pay controls, three-way matching, payment methods, vendor master-data governance, duplicate-payment prevention, sales-tax treatment, cut-off, accruals, and AP subledger reconciliation.
• Experience working in a high-volume, multi-entity environment.
• Strong understanding of accounting principles, internal controls, fraud-prevention practices, segregation of duties, and audit requirements relevant to accounts payable.
• Advanced Excel skills and hands-on experience with ERP and procure-to-pay systems, including data analysis, reconciliations, workflow testing, reporting, and issue resolution.
• Strong analytical, organizational, and problem-solving skills.
• Excellent attention to detail and ability to meet deadlines.
• Strong communication and vendor-management skills.
• Ability to prioritize multiple tasks in a fast-paced environment.
• Experience supporting process improvements and automation initiatives.
• Previous experience providing guidance and training to AP team members.

Human Resources:

While we thank you for your interest, only select applicants will be contacted regarding the position.

Ontario Medical Supply is an inclusive and equal opportunity employer committed to providing diversity and accommodations for applicants upon request at any stage of the recruitment process in accordance with the Accessibility for Ontarians with Disabilities Act (AODA) and the Ontario Human Rights Code. All applicants must make their requirements known when contacted.

The company reserves the right to close the competition based on business need and a sufficient pool of candidates who have applied.

AI will be used in the recruitment process.

Company

OMS / Royal Drugs

Opening Date

Oct 08, 2026

Requirements

Type

Description

Status

A&AODA Accessibility & AODA Acknowledgment Required within 30 days after job starts

EO -2 Quality & Regulatory Training (Phase 2) Required within 30 days after job starts

EO-1 General Orientation (Phase 1) Required within 30 days after job starts

WHMIS WHMIS 2015 Required within 30 days after job starts

WPVH Workplace Violence and Harassment Required within 30 days after job starts