The goal of this study is to design a system/user interface for inbound and outbound materials in the warehouse with the use of a cell phone application that is linked in the ERP system of the company. Shelf management, inbound and outbound operations were the operations that have been improved by implementing the use of QR code scanning in the application. Root Cause Analysis (RCA) was utilized in identifying processes that involve personnel to make decisions and actions that can lead to human error that can contribute to decreasing the warehouse’s operational effectiveness. Questionnaire was given to the R/M Warehouse supervisor, leader and staff. The questionnaire was designed to: 1.) find common problem/s met in warehouse processes and task 2.) Collect suggestions for system improvement and design 3.) Identify user requirement/s for the system. A total of 37 warehouse personnel of Company Y took part last January 19, 2021 in answering the questionnaire. Out of the 37 participants 5(14%) are leaders and 32(87%) warehouse staff assigned various tasks. Process was reviewed as well by utilizing the HIPO chart and was able to identify processes that involve personnel to make decisions and actions that can lead to human error that can contribute to decreasing the warehouse’s operational effectiveness. The comparison shows unnecessary operations were eliminated after the use of the warehouse application thus it reduces manpower work hours needed to perform the warehouse processes and it eliminates paper records that can lead to encoding inaccurate information in the ERP system.