Keeping animals is a very fun hobby because pets can be entertainment in itself to relieve fatigue from daily activities. But there are certain times, the owner doesn't have time to take care of the pet, especially if there are tasks out of town for a few days, or other activities. Pet care is a solution to keep pets taken care of while their owners don't have time to take care of them. Animal care provides care facilities for pets that are deposited. Currently, many provide animal care services with the aim of helping facilitate the search for the best animal care services and according to needs. Developed a mobile application system in the form of an animal care marketplace using React Native technology. The purpose of making this system is so that animal owners can find animal care centers according to their wishes. There are two users who play a role in this system, namely animal owners and animal day care workers. The animal owner's user system can determine a message schedule to entrust animals to the care feature and choose the cage to be occupied. The advantage of this feature is that pet owners can also know the condition of their pets, because each officer will send information. Through testing this system, it is known that there are about 73% of users who want to use this system. This system helps people who have pets not to worry about doing care.

Software untuk mengelola data transaksi menjadi laporan keuangan sangat banyak dipakai di berbagai sektor bisnis. Software yang cepat, akurat, reliabilitas tinggi serta mudah diimplementasikan menjadi faktor pemilihan software. Oleh karena itu, dikembangkan software pengelola transaksi dengan menggunakan PWA (Progressive Web Apps). Alasan memanfaatkan PWA karena dapat memenuhi kebutuhan software yang dibutuhkan oleh pengguna. Secara garis besar, kelebihan PWA ini terletak pada bagian notifikasi, dapat diakses secara offline, memiliki performa yang bagus, sistem keamanan yang bagus (karena harus menggunakan HTTPS), dan dapat diterapkan pada web. Penerapan PWA ini juga sama seperti memakai aplikasi di smartphone. Uji coba dalam pengembangan ini dilakukan dengan dua metode, yaitu Performance Testing dan Functionality Testing. Hasil uji coba menyatakan bahwa web akuntansi dengan PWA mempunyai kecepatan yang hampir sama dengan native tetapi User Experience PWA lebih baik dibandingkan aplikasi native. Hasil dari Functionality Testing menunjukan Web App dapat berjalan dengan baik sesuai fungsi setiap fitur.

In terms of establishing and nurturing startups, finances are required to ensure their long-term viability. Startups at this stage require the support of investors as financial backers. The dearth of forums for promoting companies makes it difficult for developers to get traction and attract investors. The bidding method for entrepreneurs and investors was designed with these limits in mind. The waterfall concept is used in the design of this offering system, in which the website design is completed consecutively from beginning to end. The purpose of this website's design is to make it easier for developers to advertise startups or "products," to create possibilities for developers to meet investors indirectly, and to make it easier for investors to analyze startups with future potential. Startups are classified according to their valuation value; the Discounted Cash Flow approach was used to calculate the valuation for this website design