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.
Company Background 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. Company Culture & Mission TSI is the sales, customer service, and back-office support engine behind many of the brands and businesses we serve. Full-Cycle Accounting
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.
Accounts Payable & Vendor Management
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.
Accounts Receivable, Customer Billing & Collections
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 Operations and Sales to ensure changes in scope, pricing, headcount, hours, services, and client requirements are reflected accurately in billing.
Monitor accounts receivable aging and actively manage collections.
Identify billing leakage, missed revenue, credits, write-offs, and other opportunities to improve cash flow.
Recommend improvements to customer billing practices, payment terms, and collection procedures.
Develop reporting to help leadership understand revenue, outstanding receivables, and cash flow.
Financial Reporting & Analysis
Produce monthly management reporting, including profit and loss statements, balance sheets, cash flow reporting, and key financial metrics.
Provide executive leadership with meaningful financial analysis—not simply financial statements.
Develop budgets, forecasts, and cash flow projections.
Assist leadership with financial planning and business decisions.
Provide financial modeling and analysis for new clients, contracts, business opportunities, and major expenditures.
Multi-Entity & International Accounting
Manage accounting activities across multiple related entities.
Maintain accurate intercompany transactions and reconciliations.
Support multi-currency accounting and international operations.
Develop consistent accounting and reporting practices across the organization.
Work with external accounting, tax, payroll, banking, and financial professionals as needed.
Cost Control & Business Improvement
Analyze operating expenses and identify unnecessary or excessive spending.
Identify revenue leakage and missed billing opportunities.




Establish financial controls that reduce errors, waste, fraud, and unnecessary expenses.
Continuously look for ways to improve profitability, cash flow, and financial visibility.
Internal Controls & Best Practices
Establish and maintain appropriate accounting policies and procedures.
Develop appropriate segregation of duties and approval controls as the organization grows.
Establish standardized processes for AP, AR, billing, reconciliations, expenses, and financial reporting.
Help establish scalable accounting systems and procedures that can support continued company growth.
Tax, Audit & Compliance
Coordinate with external CPAs, tax professionals, auditors, and other advisors.
Prepare schedules and supporting documentation required for tax filings and audits.
Ensure accounting records are maintained in accordance with GAAP and applicable regulatory requirements.
Assist with federal, state, local, and international accounting and reporting requirements as applicable.
Monitor changes in accounting requirements and recommend necessary changes to company practices.
Serve as the primary accounting and financial resource for executive leadership.
Bachelor's degree in Accounting, Finance, or a related field.
~7+ years of progressive accounting experience.
~ Experience managing the full accounting cycle.
~ Experience with accounts payable, accounts receivable, general ledger, reconciliations, and financial reporting.
~ Experience managing customer billing and collections.
~ Strong Excel skills, including formulas, pivot tables, and financial analysis.
~ Ability to work independently and take complete ownership of the accounting function.
~ Previous Controller, Assistant Controller, Accounting Manager, or Senior Accounting Manager experience.
Experience in a BPO, call center, professional services, technology, or multi-location business.
Experience with multi-entity and intercompany accounting.
Experience with international operations and multi-currency accounting.
Experience with customer contract billing and revenue recognition.
Experience with budgeting, forecasting, and cash flow management.
Experience implementing or improving accounting systems and processes.
Payroll accounting experience.
Experience coordinating with external CPA/tax firms.
Opportunity to build and improve the accounting function.
Growing integral organization.
Job Type: Full-time
~Dental insurance
~ Health insurance
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📌 Senior Accounting Manager / Controller (Comunidad Valenciana)
🏢 Tri Source & Nearstaff Solutions
📍 Comunidad Valenciana