Buyer, Indirect Procurement

Castelion Corporation; Torrance (CA); On-site; USD 60,000 - 90,000; Full time

Job summary

Castelion Corporation is seeking a detail-oriented Buyer to support Indirect Procurement across facilities, equipment, tooling, office supplies, and services. You will obtain quotes, issue purchase orders, monitor deliveries, and resolve issues within a fast-paced environment.

In this early-career role, you’ll work closely with internal stakeholders and suppliers, maintain accurate records in ERP systems, and contribute to cost-reduction initiatives while ensuring compliance with Castelion

Qualifications

• Bachelor’s degree in supply chain, business, finance, operations, or a related field, or equivalent education and experience.
• Up to two years of experience in purchasing, procurement, supply chain, operations, accounts payable, order management, or a related function.
• Clear written and verbal communication skills.
• Working knowledge of Microsoft Excel and other Microsoft Office applications.

Responsibilities

• Process purchase requisitions and issue purchase orders for indirect materials, equipment, and services.
• Review purchasing requests for completeness, accuracy, required approvals, and supporting documentation.
• Obtain supplier quotations and assist with evaluating pricing, availability, lead time, payment terms, and commercial requirements.
• Coordinate with stakeholders to clarify scopes of work, specifications, delivery requirements, and requested need dates.
• Monitor open purchase orders and communicate order status, delivery risks, and changes to internal stakeholders.
• Follow up with suppliers to expedite critical orders and resolve late deliveries, invoice discrepancies, damaged shipments, and other transactional issues.
• Support supplier onboarding by collecting required documentation and coordinating with internal teams.
• Maintain accurate supplier, purchase-order, pricing, lead-time, and delivery information within Castelion’s procurement and ERP systems.
• Assist with negotiations involving pricing, freight, lead time, minimum-order quantities, payment terms, and other standard commercial conditions.
• Support competitive bidding, supplier comparisons, spend analysis, and cost-reduction initiatives.
• Partner with facilities, manufacturing, engineering, finance, information technology, security, and other departments to support operational purchasing requirements.
• Help ensure purchasing activities comply with Castelion policies, approval requirements, contractual obligations, and applicable government regulations.
• Develop productive supplier relationships and provide responsive support to internal customers.
• Identify opportunities to improve purchasing processes, supplier responsiveness, and transaction efficiency.

Skills

Organizational skills

Commercial curiosity

Attention to detail

Clear communication

Education

Bachelor’s degree in supply chain, business, finance, operations, or related field

Tools

Microsoft Excel

ERP/MRP system

Job description

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.

Buyer, Indirect Procurement

As a Buyer supporting Indirect Procurement, you will help purchase the goods and services that enable Castelion’s teams and facilities to operate effectively. You will support purchasing activities across categories such as facilities, maintenance, repair and operations (MRO), equipment, tooling, office supplies, professional services, software, and other operational requirements.

This is an early-career opportunity for someone who is organized, responsive, commercially curious, and eager to build a foundation in procurement. You will work closely with internal stakeholders and suppliers to obtain quotes, place purchase orders, monitor deliveries, resolve order issues, and maintain accurate purchasing records in a fast-paced environment.

Responsibilities

• Process purchase requisitions and issue purchase orders for indirect materials, equipment, and services.
• Review purchasing requests for completeness, accuracy, required approvals, and supporting documentation.
• Obtain supplier quotations and assist with evaluating pricing, availability, lead time, payment terms, and commercial requirements.
• Coordinate with stakeholders to clarify scopes of work, specifications, delivery requirements, and requested need dates.
• Monitor open purchase orders and communicate order status, delivery risks, and changes to internal stakeholders.
• Follow up with suppliers to expedite critical orders and resolve late deliveries, invoice discrepancies, damaged shipments, and other transactional issues.
• Support supplier onboarding by collecting required documentation and coordinating with internal teams.
• Maintain accurate supplier, purchase-order, pricing, lead-time, and delivery information within Castelion’s procurement and ERP systems.
• Assist with negotiations involving pricing, freight, lead time, minimum-order quantities, payment terms, and other standard commercial conditions.
• Support competitive bidding, supplier comparisons, spend analysis, and cost-reduction initiatives.
• Partner with facilities, manufacturing, engineering, finance, information technology, security, and other departments to support operational purchasing requirements.
• Help ensure purchasing activities comply with Castelion policies, approval requirements, contractual obligations, and applicable government regulations.
• Develop productive supplier relationships and provide responsive support to internal customers.
• Identify opportunities to improve purchasing processes, supplier responsiveness, and transaction efficiency.

Basic Qualifications

• Bachelor’s degree in supply chain, business, finance, operations, or a related field, or equivalent education and experience.
• Up to two years of experience in purchasing, procurement, supply chain, operations, accounts payable, order management, or a related function. Relevant internships or co-op experience may be considered.
• Strong organizational skills and attention to detail.
• Ability to manage multiple priorities and follow assignments through completion.
• Clear written and verbal communication skills.
• Working knowledge of Microsoft Excel and other Microsoft Office applications.

Preferred Skills and Experience

• Experience creating or managing purchase orders in an ERP, MRP, procurement, or purchasing system.
• Exposure to indirect procurement categories such as facilities, MRO, equipment, tooling, professional services, software, office supplies, or general operations.
• Experience requesting and comparing supplier quotations.
• Familiarity with supplier onboarding, invoice reconciliation, or accounts-payable processes.
• Ability to analyze basic pricing, spend, delivery, and supplier-performance data.
• Experience working in aerospace, defense, manufacturing, technology, construction, or another fast-paced operational environment.
• Basic understanding of procurement terms, including lead time, payment terms, freight, warranties, and total cost.
• Interest in developing knowledge of FAR/DFARS, ITAR/EAR, and government-contracting requirements.
• Demonstrated initiative, sound judgment, curiosity, and willingness to learn.

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 [e-mail]. 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.