Senior Accounting Manager​/Controller

Job Summary

Tri Source International is a growing global Business Process Outsourcing (BPO) organization headquartered in Valencia, California. We support clients across the United States, Mexico, Latin America, and other international markets through customer service, sales, back-office, and technology solutions.

We are seeking an experienced Senior Accounting Manager / Controller to take ownership of the accounting and financial operations for multiple businesses and entities under common ownership.

This is a hands‑on role and the primary accounting and finance position within the organization. The successful candidate will be responsible for the full accounting cycle while working directly with executive leadership to provide financial insight, improve processes, strengthen controls, and support business decisions.

This role goes well beyond traditional bookkeeping or accounting management. We are looking for someone who can own the numbers from transaction‑level accounting through executive‑level financial reporting, while also identifying opportunities to improve profitability, reduce costs, strengthen cash flow, improve customer billing and collections, and establish sound financial practices.

The ideal candidate is a proactive business partner who does not simply report what happened but understands why it happened, identifies risks and opportunities, and makes practical recommendations for what the business should do next.

Tri Source International is a global BPO organization providing customer service, sales, back‑office, and technology solutions to businesses across multiple industries.

We help our clients simplify outsourcing so they can focus on their core business and growth. Our operations include teams in the United States, Mexico, and Latin America, providing candidates with exposure to a dynamic, multi‑entity and international business environment.

TSI is the sales, customer service, and back‑office support engine behind many of the brands and businesses we serve. We are selective about the clients we partner with and the teammates we invite to join our organization.

Our culture is built around six core values:

People | Passion | Balance | Transparency | Results | Fun

We believe strong businesses are built by people who take ownership, work collaboratively, communicate openly, and are committed to achieving meaningful results.

• Own the day‑to‑day accounting function for multiple companies and entities under the same ownership umbrella.
• Maintain accurate general ledgers and financial records for each entity.
• Manage the complete accounting cycle, including journal entries, accruals, prepaid expenses, fixed assets, depreciation, and month‑end close.
• Perform bank, credit card, balance sheet, intercompany, and other account reconciliations.
• Maintain appropriate supporting documentation for all significant accounting transactions.
• Establish and maintain a consistent accounting structure and chart of accounts across entities where appropriate.
• Identify and resolve accounting discrepancies proactively.

• Manage the complete accounts payable process.
• Review vendor invoices for accuracy, appropriate coding, approvals, and supporting documentation.
• Establish appropriate approval and payment controls.
• Monitor vendor costs and identify opportunities to reduce expenses.
• Review recurring expenses, contracts, subscriptions, and service agreements for unnecessary or duplicative costs.
• Maintain strong vendor relationships while ensuring the company receives appropriate pricing and terms.
• Recommend opportunities to renegotiate vendor agreements and improve purchasing practices.

• Own the customer invoicing process across multiple businesses and entities.
• Ensure customers are billed accurately, timely, and in accordance with contracts and service agreements.
• Develop and maintain billing procedures and controls.
• Review contracts and pricing structures to ensure all billable services, fees, pass‑through expenses, and other charges are captured.
• Partner with…