Corporate Controller

Purpose of the Role

The Corporate Controller is a newly created, hands‑on leadership role that owns the day‑to‑day transactional accounting operations of S3 Aero Defense and its subsidiaries. As the company scales - organically and through acquisition - the Controller is responsible for running an accurate, timely, well‑controlled, and increasingly automated transactional accounting engine, and for leading the accounting integration of acquired businesses.

Full‑time

The Corporate Controller is a newly created, hands‑on leadership role that owns the day‑to‑day transactional accounting operations of S3 Aero Defense and its subsidiaries. As the company scales - organically and through acquisition - the Controller is responsible for running an accurate, timely, well‑controlled, and increasingly automated transactional accounting engine, and for leading the accounting integration of acquired businesses.

This role is deliberately structured to complement a self‑contained FP&A function. The Director of Finance and the FP&A team own the monthly close, financial and management reporting, technical accounting (including revenue recognition), budgeting, and forecasting. The Controller owns the transactional foundation those outputs are built on - accounts payable, accounts receivable and collections, payroll accounting, treasury and cash operations, inventory and cost‑accounting transactions, the day‑to‑day integrity of the general ledger, and the internal control environment.

Evaluating customers' credit standing and managing limits and risk mitigation frameworks (such as credit insurance, D&B review, etc.). Success means transactional books that are clean, current, and audit‑ready - freeing finance leadership to focus on strategy, reporting, and M&A.

Chief Financial Officer

Milwaukee, WI (in office with hybrid flexibility on certain days as needed)

• Own end‑to‑end transactional accounting: accounts payable and disbursements; accounts receivable, billing, and collections; payroll accounting; cash and treasury operations; fixed assets; inventory and cost‑accounting transactions; and intercompany transactional processing.
• Deliver clean sub‑ledgers on schedule so the FP&A team can complete the monthly close and reporting without rework.
• Own account reconciliations across cash, AR, AP, inventory, accruals, and intercompany - resolving variances promptly and maintaining a documented, complete reconciliation cycle.
• Optimize working capital through disciplined management of payables, receivables and DSO, and cash application.

• Design, document, and operate a scalable control framework over transactional processes that is audit‑ready today and can withstand increasing scrutiny (including SOX‑style controls) as the company grows.
• Serve as a primary audit contact for transactional and balance‑sheet areas, supporting a timely, clean external audit.

• Lead the accounting integration of acquired entities: onboarding AP/AR/payroll/GL processes, mapping charts of accounts and systems, standardizing transactional policies, and establishing intercompany and consolidation mechanics.
• Support financial due diligence and own the transactional‑accounting workstream for Day 1 readiness and post‑close integration.
• Build a repeatable accounting‑integration playbook that scales across multiple acquisitions and, where needed, multiple ERPs.

• Own and continuously improve transactional processes in the Pentagon 2000
  
  SQL ERP; drive automation of high‑volume, manual workflows (e.g., payment disbursement, billing/AR, reconciliations).
• Partner with IT and the data/AI initiatives to reduce manual effort, improve data integrity, and support scalable, multi‑entity reporting.
• Operate across multiple ERP systems as needed during acquisition‑integration periods.

• Lead, develop, and scale the transactional accounting team (Accounting Manager and AP, AR/credit, payroll, and staff‑accounting personnel); build depth, cross‑training, and succession for key roles.
• Convert…