This study aims to determine the service provided by employees of UMKM Serba Cetak towards consumer satisfaction after completing a purchase or order at UMKM Serba Cetak. The study covers in accordance with the Key Performance Indicators consisting of six divisions and analyzes the level of service towards consumer satisfaction. The research method used involves observation for one month at UMKM Serba Cetak and interviews as well as distributing questionnaires to consumers who have made orders at UMKM Serba Cetak, as well as market data analysis to identify the relationship between excellent service and consumer satisfaction at UMKM Serba Cetak. The sample in this study was the entire population of 15 people; the analysis and testing tools used were IBM SPP Version 21 and Microsoft Excel. The results of the study showed that the work in accordance with the Key Performance Indicators experienced significant changes at UMKM Serba Cetak, such as increased sales and income every month, financial data was well managed, and online promotions received good engagement. Based on the results of the validity test with a value of 0.5140, which was declared valid, and the results of the CSI analysis obtained were 86.90%, which were declared very satisfied.

A web-based sales information system is a key element in the success of modern business, especially in the rapidly growing e-commerce era. Developing information systems that are responsive and adaptive to change is a major challenge in meeting dynamic market demands. The problem that occurs is that the web application that is built is not in accordance with the wishes and needs of the user so that applications and transactions are difficult to carry out. This article describes the implementation of the prototype method in developing a web-based sales information system, with a focus on aspects of needs analysis, design, development, implementation, and testing and evaluation. By developing a web-based sales information system with a prototype method, consumers can easily operate the application and make transactions easier because this system can be used anywhere and anytime and its development involves consumers, so this system can really be used well and easily.