The Buyer III at Sierra Space utilizes advanced understanding and expertise in procurement, supply chain management, and strategic sourcing to manage and lead procurement activities for critical and high-value purchases. They interact with leadership, suppliers, and external personnel to ensure seamless coordination and compliance with company policies and procedures. The role involves contract negotiation, risk management, and supplier relationship management, alongside analyzing market dynamics and forecasting procurement needs. Additionally, the Buyer III mentors junior buyers and provides necessary training, ensuring the success and efficiency of the procurement team.