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.
• Ensure compliance with US GAAP, HSO accounting policy, and applicable tax/regulatory 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.
• Strong US GAAP fundamentals and disciplined account reconciliation practices.
• Hands-on treasury / cash management and bank reconciliation experience.
• Advanced Excel skills and experience with ERP / accounting systems.
• Excellent attention to detail, integrity, and comfort working with audit and compliance documentation.
• Preferred Experience Includes: 
  • CPA strongly preferred; MBA a plus.
  • Professional-services or project-based accounting experience and working knowledge of ASC 606 revenue recognition.
  • Experience with Dynamics 365 Finance & Operations / Great Plains.
  • Experience standing up or improving AP/AR/treasury processes, controls, and automation.
  • Experience with 1099 filing and multi-state sales/use tax compliance.

Benefits
We offer competitive pay with and performance-based bonus. Our employees also enjoy generous paid time off and a flexible and affordable benefits program designed to help you be and stay well, including: medical, dental & vision coverage, flexible spending accounts, health reimbursement account, and a 401(k) plan with a company match. Additionally, you’ll have the benefit of working alongside enthusiastic and energetic teammates in a dynamic and thriving environment.