PT Telkom Indonesia TBK is one company that consistently serves the country and provide telecommunication to Indonesian spread throughout Indonesia. Entering the era, Telkom Indonesia continues to develop digital business, including Indihome, and Internet of Things. In development at PT Telkom to become digital communication company, there was a trial and error in the service to customers. As what happened at the PT Telkom Lembong - Bandung, there several problems that reduce the effectiveness of the work carried out by Boss, Maintenance Technician and Sales. There are 2 main problems that researcher could sum up from interview that researcher did with potential user. The first problem is the troubled from boss or atasan for monitoring or supervising technicians in their work, moreover, there is often miscommunication between technicians. The intention from miscommunication between technicians is technicians could go to the same user's place at the same time. The second problem is the sales put the data from new customers manually. In addition to the occurrence of data could be tucked away, customer data that has been obtained is not neatly arranged. With the problems that has described above, Telkom Lembong need an application system to help oversee the work of technicians and help the sales in data collection new customers. This application take a case study in Telkom Lembong, name the application is TEKSAS. In development the application TEKSAS using method SDLC Waterfall. In research and development, researchers conducted needs analysis, design, implementation and testing. At the analysis stage obtained 22 functional. At the implementation stage using the Java programming language using Android studio. At the testing stage, there are 3 test, namely unit testing, validation testing, and compatibility testing.
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