Senior Supply Chain Planner

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. Senior Supply Chain Planner As a Senior Supply Chain Planner, you will own planning execution for assigned programs, commodities, or product areas and help translate engineering and program requirements into executable, resilient supply plans. You will operate with a high degree of autonomy, use data and sound judgment to prevent hardware blockers, and influence cross-functional partners across sourcing, engineering, quality, manufacturing, finance, and program management. This role is intended for a planner who can independently manage complex work, lead resolution of material and capacity risks, improve planning processes, and serve as a trusted resource to less-experienced planners. At the upper end of the level, you will be expected to shape planning strategy across a broader program or commodity and lead initiatives without formal people-management responsibility. Responsibilities Own end-to-end supply planning for assigned programs, commodities, or product areas, converting master schedules and demand signals into achievable material, capacity, and inventory plans. Load, maintain, and report on supply plans in the MRP/ERP system; ensure the accuracy and integrity of bills of material, planning parameters, work orders, purchase orders, lead times, and other planning data. Partner with strategic sourcing, engineering, quality, manufacturing, finance, and program teams to develop and execute production and sourcing strategies for near-term development milestones and future production scale. Identify, quantify, and actively manage material, supplier, capacity, quality, schedule, and infrastructure risks. Develop recovery plans, escalate decisions with clear recommendations, and drive issues to closure. Lead Clear to Build readiness for assigned hardware, providing timely, concise updates on critical supply issues, blockers, recovery actions, and decision needs to program and functional leadership. Evaluate supply-plan alternatives using quality, reliability, lead time, cost, cash, and schedule considerations; recommend tradeoffs that support robust and sustainable supply. Forecast spend, supply, inventory, capacity, and infrastructure requirements in partnership with business stakeholders and operations planning teams. Collaborate with engineering and quality to resolve rejected, discrepant, or nonconforming materials; support root-cause analysis and corrective actions that prevent recurrence. Work directly with suppliers and internal stakeholders to improve delivery performance, responsiveness, quality, and service levels while maintaining compliance with company and government requirements. Create and improve planning processes, metrics, dashboards, and standard work. Use data analysis to identify systemic constraints and opportunities for cost, cycle-time, and reliability improvements. Mentor and support onboarding of planners; share planning methods, systems knowledge, and lessons learned across the team. Lead projects or workstreams as assigned. Operate in accordance with company policies, procedures, export controls, security requirements, and applicable government regulations. Basic Qualifications Bachelor’s degree in supply chain, operations, industrial engineering, business, or a related field; equivalent experience may be considered. 4+ years of experience in supply chain planning, materials planning, production control, procurement, operations, manufacturing, or a related…

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