This is when the app starts to come to life. A good developer with the appropriate tech-stack and skillset should be chosen for the work. All your documents and designs made will be gathered and will be analyzed by your software developer for development. Each software developer has their own methodology or way of development.
To give you an idea. Here is a method we follow for an MVP(minimum viable product) build:
1. Architecture. Creation of organized specification document outlining scope of development and milestone schedules. This is based on all gathered requirements and designs blueprints.
2. Sprint Planning. Organization of the development plan in chunks of time called sprints. Tasks are organized per sprint allowing manageable completion of milestones.
3. Frontend Development. User Interface development following a customer experience centric approach to engineering. This approach create the outer shell of the application and allow early prototyping of the app in the hands of the client. It is important that the client see the app in the customer’s eyes – early into the development. Many times in this process, missing features are detected, realized and added to the grand design; saving time and cost on rework and adjustments on the code.
4. Backend Development. Developing the actual functions of the app into the frontend shell. The creation of the app's connection to the cloud and the data storage management. Processing of its data also falls in this category.
5. Integration. Full merge of Frontend and Backend. Quality control happens through rigorous testing of all user case events, and scenarios. Before releasing the app to the world, we need to make sure everything works as expected; in all the ways the customers will use it.