Mobile App Events

For one of our customers we are designing an app that promotes and manages events among all its subscribers.
If a member decides to attend an event in a public calendar, they will be given custom access with qrcode. App compatibility for ANDROID and IOS and communication with all social channels is required.
You also require subsequent assistance after the first development for subsequent updates that you will need that will be agreed with a monthly paid support subscription to be agreed upon.
The app will be based on a server that will be set according to the instructions that will be indicated by the developer. In addition, a web portal will be created so that you can see the same things as the app.
Three steps of the project are required: the app, the web portal and the final test of the entire system.
It will be important to agree on the steps to arrive at the result as soon as possible (30% - 30% - 40%)
You need to know in what format the developer wants the mockup of the graphics part that is already available to be provided.
It is essential to accept the NDA in order to be able to do the project.
Finally, it is essential to deliver the project sources and indicate all the necessary information about the development environment used.