Inventory and Cost Accounting Manager

Why Castelion, Why Now 

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability. 

This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.  

Inventory and Cost Accounting Manager

The Inventory and Cost Accounting Manager will play a key role in leading, developing, and analyzing inventory and cost-related activities in a dynamic manufacturing environment. This individual will be responsible for ensuring accurate inventory records, maintaining inventory reconciliations, analyzing standard vs. actual costs, and working closely with the production and engineering teams to ensure accurate and timely routing updates. Proficiency in NetSuite Inventory Management, Manufacturo MES, or comparable systems is strongly preferred.

Responsibilities

Inventory Management & Reporting

• Oversee all aspects of inventory accounting, including inventory tracking of raw materials, work-in-progress (WIP), and finished goods, sub-ledger maintenance, and develop inventory accounting procedures to ensure accuracy and efficiency

• Perform monthly and year-end inventory reconciliations including raw materials, WIP, finished goods in NetSuite and Manufacturo, investigate and resolve variances
• Manage the inventory month-end close process including preparation and approval of journal entries, roll forward schedules, and financial account reconciliations
• Perform quarterly lower of cost or net realizable value assessment and maintain reserves for excess and obsolete (E&O) inventory in accordance with US GAAP
• Act as primary finance liaison in physical inventory counts, review cycle count results, and investigate variances as needed
• Identify inventory valuation discrepancies and coordinate resolution across departments

Cost Accounting & Analysis

• Develop and maintain standard cost structures for materials, labor, and overhead NetSuite Inventory Management
• Perform monthly cost roll-ups and lead standard vs. actual cost variance analysis (purchase price, usage, labor, overhead); investigate root causes and recommend corrective actions to leadership
• Ensure the accuracy of Bills of Materials (BOMs) and routings within NetSuite Inventory Management to maintain precise product costing
• Collaborate with supply chain and manufacturing stakeholders to prepare and analyze manufacturing costs and margin reports to provide accurate insights for pricing decision-making
• Develop cost accounting procedures and implement best practices to improve accuracy and efficiency
• Prepare and provide cost-related documentation and analysis for external audits

Basic Requirements

• Bachelors degree in Accounting, Finance, or related field
• Minimum 5 years of cost accounting experience in a manufacturing environment
• Proficiency in NetSuite Inventory Management or similar ERP is required
• Strong understanding of US GAAP, including ASC 330, and standard costing methodologies
• Experience with inventory reconciliation, cycle counting, and physical inventory procedures
• Strong understanding of standard cost vs. actual cost analysis, variance reporting, and cost control
• Experience with routing, BOM validation, and cross-collaboration with supply chain, manufacturing, and engineering stakeholders
• Audit Experience (external or internal)
• Advanced Excel skills (pivot tables, lookups)
• Strong analytical, organizational, and communication skills
• High attention to detail with a proactive, problem-solving mindset

Preferred Skills and Experience

• CPA Preferred
• Exposure to early-stage, vertically integrated manufacturing environments
• Interest in or passion for national security, aerospace, and building hardware that matters

• [Skills and experiences]

Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.  

Other Duties 

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice. 

Additional Eligibility Requirements 

This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply. 

Affirmative Action/EEO Statement 

Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law. 

Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact [email protected]. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law. 

Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation. 

EAR/ITAR Requirements 

This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.