In a competitive market, footwear companies must continuously improve to remain relevant. This study focuses on a Peruvian SME specializing in leather shoe retail, which faces significant challenges in supply chain management, particularly in order fulfillment and inventory control. The main objective is to enhance the OTIF (On Time In Full) indicator by applying BPM and lean warehousing techniques. These methods aim to improve order delivery accuracy and reduce product defects, thereby strengthening customer trust and the company’s competitiveness. The study is structured into three sections: planning and diagnosis, solution design, and validation and sustainability. The first section analyzes the company’s performance and economic sector, identifying an 11.86% gap in the OTIF indicator compared to industry standards. Root causes of current issues were identified through quantitative analysis, highlighting the economic impact of these deficiencies. The second section designs a comprehensive solution, linking root causes to specific improvement tools. It includes a detailed implementation plan, budget, and a master experimentation plan to validate the proposed improvements. The final section evaluates the proposed solution’s functionality and ensures its long-term sustainability. Results include a 20% reduction in errors during order registration and a 1.63-hour decrease in raw material validation time. These improvements are expected to recover 80% of lost sales, amounting to S/. 184,200. This research not only aims to significantly enhance the company’s OTIF but also provides a replicable model for other SMEs in the footwear sector facing similar logistical and inventory management challenges.