Griya Bandung Trade Center is a branch of  YOGYA Group is a retail company with a format Supermaket and  Departement Store  which has served the people's needs for daily necessities. So Griya Bandung Trade Center must be able to provide satisfaction and make consumers become loyal to increase profits so that the company always maintains good relations with customers,  But the system that runs is still not good. Griya Bandung Trade Center cannot manage feedback data yet obtained because there is no media or place for consumers to express disappointment, complaints about the services provided, or other feedback. Using the android mobile application because the use of cellphones is increasing every time. Delivering feedback through mobile media is considered effective because it is mobile and easy to use. The system development method used is OOAD (Object Oriented Analisis Design) which is a software engineering approach of a system consisting of a group of interacting real-world objects.

Griya Bandung Trade Center is a branch of  YOGYA Group is a retail company with a format Supermaket and  Departement Store  which has served the people's needs for daily necessities. So Griya Bandung Trade Center must be able to provide satisfaction and make consumers become loyal to increase profits so that the company always maintains good relations with customers,  But the system that runs is still not good. Griya Bandung Trade Center cannot manage feedback data yet obtained because there is no media or place for consumers to express disappointment, complaints about the services provided, or other feedback. Using the android mobile application because the use of cellphones is increasing every time. Delivering feedback through mobile media is considered effective because it is mobile and easy to use. The system development method used is OOAD (Object Oriented Analisis Design) which is a software engineering approach of a system consisting of a group of interacting real-world objects.

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Many technologies are constantly evolving to facilitate teaching and learning. The presence system became an obstacle in practicality and recording to a central server in STMIK Mardira Indonesia that has hundreds of students, especially if the presentation is done manually, requiring considerable time and providing opportunities for human error. System Presence Development Lecturer and Student using CodeIgniter Framework-based QR Code using the programming language PHP, JavaScript, jQuery. The method used, namely, observation, interview, literature, and systems development, is used using the model of requirements, analysis, design, implementation, and testing. It can be concluded that the system has been perfected following the schedule of lectures and the system can process data with both faculty and students.