Firebase is a Backend-as-a-Service (BaaS) solution whose primary functionality is to enable development of applications in which it isn't necessary to give too much attention to background logic. As such, Firebase is suitable for very fast development of minimum viable products (MVP). The most important component of Firebase are its realtime databases, which automatically send updated data to clients after every change. In addition, there are various other tools for quick product development, like buil-it user authentication logic. Vue.js is one of the biggest modern frameworks for web user interface development. It can be integrated with Firebase easily and quickly by using a prepared software development kit (SDK). Vue.js uses built-in Firebase functionalities which are exposed through the SDK as functions separated into various modules. The aforementioned concepts are applied in the thesis through the implementation of an application that is used as an interactive forum that works in realtime. Anonymous users can read contents of the forum, but only registered and logged in users can write posts. The forum consists of a couple of basic topics and each topic is divided into categories, which in turn contain posts. All of those functionalities work in realtime – the user interface is automatically updated every time when some category, thread or post data is changed and most importantly the user gets in realtime all new posts published by other users in a thread. Work on the implementation of the application has shown that development in Firebase has its pros and cons, but Firebase has surely proven itself as a good option for developing MVP solutions.