Inventory Specialist

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 Specialist

As an Inventory Specialist, you'll play a critical role in maintaining the integrity, accuracy, and efficiency of inventory operations across physical and system environments. Working closely with Purchasing, Production, and Supply Chain teams, you will ensure that materials are accurately received, tracked, stored, and issued to support production schedules.

This role requires strong attention to detail, hands-on execution, and a continuous improvement mindset. You will be responsible for ensuring that physical inventory aligns precisely with system data to enable reliable production planning and operational excellence in a fast-paced manufacturing environment.

Responsibilities

• Track, receive, identify, and document inbound inventory in accordance with company procedures.
• Coordinate shipping activities and ensure outbound materials are accurately processed and documented.
• Maintain alignment between physical inventory stock levels and corresponding quantities and locations within the ERP system.
• Own inventory accuracy by executing and maintaining a robust cycle count program.
• Perform regular physical inventory audits and reconcile discrepancies between physical and system records.
• Collaborate with Purchasing, Production, and cross-functional stakeholders to investigate and resolve inventory variances.
• Identify root causes of discrepancies and implement corrective actions to prevent recurrence.
• Support daily production kitting and ensure the production floor is supplied with required materials per the monthly production plan.
• Optimize physical storage locations to improve space utilization, material flow, and accessibility.
• Maintain compliance with company procedures, documentation standards, and security requirements.
• Lift, carry, handle, and transport materials up to 50 lbs unassisted as required.
• Support continuous improvement initiatives focused on inventory control, process efficiency, and data accuracy.

Basic Qualifications

• High school diploma or vocational school diploma.
• 3+ years of experience in Material Management, Manufacturing Operations, or a related field.
• Experience working in ERP systems within a manufacturing environment.
• Strong proficiency in Microsoft Office tools including Word, Excel, and PowerPoint.
• Advanced Excel skills with the ability to analyze and reconcile data.
• Strong written and verbal communication skills.
• Self-motivated individual with a hands-on approach and a demonstrated continuous improvement mindset.
• Ability to obtain and maintain an active U.S. Secret security clearance.

Preferred Skills and Experience

• Experience supporting inventory operations in aerospace, defense, or high-tech manufacturing environments.
• Experience driving process improvements in inventory control or warehouse operations.
• Familiarity with structured cycle count programs and audit readiness practices.
• Experience supporting production kitting and material flow optimization.
• Professional certifications in supply chain or operations (e.g., APICS) are a plus.

All employees are granted long-term stock incentives as part of their employment as Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers three weeks of paid time off per year.

Leadership Qualities

Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support.

High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion's mission and consistently look for ways to contribute to the company's technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.

Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.

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.