The Assistant Controller / Senior Accountant plays a key role in supporting the Controller and ensuring the accuracy and efficiency of day-to-day accounting operations at MacKay Contracting Ltd.

This role is highly hands-on and focused on transactional integrity across aggregates operations, inventory, and job costing, while also providing oversight and support to Accounts Receivable and Accounts Payable functions. The position will act as a critical bridge between operations and accounting, ensuring data is captured accurately and supports reliable financial reporting.

Responsibilities & Duties:

This role is primarily focused on execution, data integrity, and operational accounting support.

Aggregates, Inventory & Job Costing:

• Manage and maintain aggregates accounting, including inventory tracking, costing, and reconciliation

• Ensure accurate and timely entry of production, sales, and inventory movements

• Oversee job cost allocations, ensuring costs are coded correctly and consistently

• Work closely with operations to ensure data is captured properly at source

• Investigate and resolve discrepancies in job costing and inventory balances

Day-to-Day Accounting Operations:

• Prepare and review journal entries, accruals, and account reconciliations

• Maintain general ledger integrity and ensure proper coding across all transactions

• Assist with month-end close processes, including supporting schedules and working papers

AR & AP Oversight (Support Role):

• Provide oversight and support to AR and AP functions alongside the Controller

• Monitor collections, aging, and vendor balances, flagging issues as they arise

• Assist with resolving discrepancies, approvals, and process improvements

• Ensure purchase order and invoicing processes are being followed

Payroll & Administrative Support:

• Provide backup support for payroll processing as needed

• Assist with benefits tracking, accruals, and related reconciliations

Reporting & Data Integrity:

• Support the Controller in preparing weekly and monthly reporting

• Ensure underlying data is complete, accurate, and aligned with reporting requirements

• Assist in maintaining cash flow tracking inputs and supporting schedules

Systems & Process Improvement:

• Work within Trimble Viewpoint Spectrum to maintain accurate system data

• Identify opportunities to improve workflows, data capture, and efficiency

• Assist with ongoing system optimization and process standardization

Qualifications & Skills:

• 3–7 years of accounting experience, ideally in construction, aggregates, or a project-based environment

• Strong experience with job costing, inventory, and high-volume transactional environments

• Experience with Trimble Viewpoint Spectrum is a strong asset

• Solid understanding of general accounting principles (ASPE knowledge beneficial but not required at a deep technical level)

• High attention to detail and strong data integrity mindset

• Strong organizational skills and ability to manage multiple priorities

• Comfortable working in a hands-on, operational role

• Strong communication skills, particularly in working with operations teams

• CPA designation or working towards designation is an asset but not required

Position Fit:

This role is ideal for someone who enjoys being close to the operations of the business and takes ownership of the accuracy of day-to-day financial data. The position offers the opportunity to grow into a more senior role over time, while working closely with the Controller and finance leadership team.