Contus Fly is an instant messaging solution especially to build own chat app for business. Contus Fly is engineered for sturdy tech platforms and languages like Erlang, Ejabberd, XMPP server, Amazon S3 server, etc. Contus Fly enables enterprises who want a reliable, secure and scalable real-time chat app for business build their own chat systems that no other private parties can gain access to. On an enterprise scale, Contus Fly weighs high on productivity-enhancing features. It comes with a 5-tier communication and collaboration abilities that will allow users to get things done the go without any hassles. Real-time communication, collaboration, organization, security, and scalability are the five major capabilities that Contus Fly imparts to its user groups. Communication can be made possible in the form of instant chat, voice calling, voice messaging, video calling and group conferencing. Multi-media sharing, document sharing, screen sharing, real-time geo-location sharing are some of the highlight collaboration features that Contus Fly puts forth. Further, all the chat messages can be synced and stored in the cloud server making it possible to access them from any device. Users can resume their chats from another system from where they had left off in another system. Users can also run quick searches for conversations, files or multimedia with multiple filters. Security has been given high importance while engineering the real-time chat app for business. End-to-end encryption ensures total security for all text messages and multimedia content. The encryption ensures that the data exchanged between the user device and the database server is not intercepted or leaked under any circumstances. Contus Fly is coded using FreeBSD, the same operating system that has turned WhatsApp into a global phenomenon. For database management, Contus Fly uses the Mnesia DB which takes care of the heavy responsibility of handling real-time requests and immediate responses. Amazon S3 Bucket gives maximum scalability to store multimedia and files that users need from time to time. Cassandra database handles the task of storing chat history enabling users to retrieve their chat logs whenever needed.