HSO is seeking a diligent and proactive Assistant Controller to own the company’s accounts payable, accounts receivable, and treasury / cash management towers and to lead the team that runs them. This role keeps AP, AR, and cash accurate, timely, and audit-ready; manages and develops the staff performing those functions; and supports the broader accounting team through month-end close, reconciliations, and reporting. The ideal candidate pairs strong US GAAP fundamentals and reconciliation discipline with proven people-management experience and hands-on command of full-cycle AP, AR, and treasury.

A CPA and experience in a professional-services or project-based environment (ASC 606 revenue recognition, milestone/T M billing) are strongly preferred. As an Assistant Controller you can expect to… Accounts Payable (AP) — Full Ownership Own the full AP cycle end to end: vendor onboarding, invoice intake, GL coding, approval routing, and timely, accurate payment. Manage payment runs across ACH, wire, and check, plus corporate card and employee expense reconciliation.

Maintain vendor master data and W-9 / 1099 compliance, and lead year-end 1099 filing. Enforce approval and segregation-of-duties controls; resolve vendor inquiries and statement discrepancies. Manage AP aging and accruals to ensure complete, accurate period-end liabilities.

Accounts Receivable (AR) Billing — Full Ownership Manage AR aging and collections; escalate at-risk balances and drive measurable DSO improvement. Reconcile customer accounts, resolve billing disputes, and maintain clean, complete cash application. Drive process automation and efficiency to the AR function to drive improvement in AR/DSO.

Support, manage and train the team supporting AR Treasury Cash Management — Full Ownership Manage daily cash positioning, bank reconciliations, and short-term cash forecasting. Monitor liquidity and support working-capital management across AR/AP timing (DSO/DPO). Support intercompany funding and cash reporting Team Leadership People Management Lead, manage, and develop the AP, AR, and treasury staff — hiring, onboarding, coaching, and performance management.

Set priorities, assign work, and ensure coverage and continuity across the AP/AR/treasury towers. Establish and document standard operating procedures, and build bench strength through cross-training. Hold regular one-on-ones and performance reviews; support goal-setting and career development.

Serve as the escalation point for complex AP, AR, and treasury issues. Month-End Close General Ledger — Supporting the Broader Accounting Team Support the broader accounting team through the month-end and quarter-end close; contribute to a timely, accurate close without owning it end to end. Prepare and review journal entries, accruals, and reconciliations for AP, AR, cash, and related balance-sheet accounts.

Ensure AP, AR, and treasury close tasks are delivered accurately and on schedule so the team can close on time. Reconcile assigned balance-sheet accounts and investigate and clear reconciling items on a timely basis. Support ASC 606 revenue recognition (AR, deferred revenue, unbilled/contract assets) in coordination with the accounting team.

Controls, Compliance Audit Maintain internal controls and audit-ready documentation across AP, AR, treasury, and assigned GL accounts. Support external audit, tax, and banking requests.

Requirements (1099, Multi-State Sales/Use Tax)

Identify and drive process automation and continuous improvement across the AP, AR, and treasury cycles. Sound interesting? If so, you’ll have… Bachelor’s degree in Accounting, Finance, or a related field.

7+ years of progressive accounting experience, including full-cycle AP, AR, and treasury, with direct people-management experience. Demonstrated experience supervising, developing, and managing the performance of accounting staff.