Inventory Specialist

Castelion was founded to restore America’s ability to field advanced weapons at speed and scale. Inspired by the engineering urgency of the WWII and Apollo eras, we combine rapid iteration, vertical integration, and scalable manufacturing to deliver affordable, high-performance strike systems. Our mission: rebuild industrial agility to strengthen national security and outpace evolving threats.

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.
  

Requirements

Basic Qualifications

• 5+ 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.
  
• Experience working with and handling hazardous materials.
  
• 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.
  
• Clear communicator capable of working in a fast-paced environment.
  

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.
  
• Active U.S. Government security clearance or eligibility to obtain one.
  

Benefits

• Employee Equity: Meaningful equity for all full-time employees - share value has increased 150x in three years
  
• Personal Time Off: Four (4) weeks of paid time off to unplug, reset, and come back sharp—velocity matters, burnout doesn't
  
• Company Paid Holidays: Ten (10) company paid holidays
  
• Medical: We offer plans at 100% employee covered and 80% of dependent coverage
  
• Dental & Vision: We cover 90% employees and 80% for dependents to ensure you and your family have access to quality preventive and ongoing care
  
• FSA/HSA: To support long-term health and financial resilience, we offer FSA and HSA options that allow employees to set aside pre-tax dollars for eligible medical and dependent care expenses
  
• Retirement: 401k plan offered to support long term financial growth along side high-impact, high-velocity work
  
• Paid Parental Leave: We support growing families with meaningful time to bond and recover. Birthing parents are eligible for up to 10 weeks of paid leave, while non-birthing parents may take up to 4 weeks of paid leave. This time can be used for pre-natal care, pregnancy, childbirth, and related medical needs—ensuring every parent has the support they need during this important life moment.8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees
  
• Meals & Catering: Frequently catered lunches and team meals, plus company-covered meals when extra time or effort is required
  
• Snacks & Beverages: Fully stocked kitchen with unlimited snacks and drinks to keep you fueled throughout the day
  
• Performance & Fitness: $100 monthly fitness stipend to support peak performance and health, both inside and outside of work
  
• EV Charging: Onsite electric vehicle charging available for employees