Is the project development sequence correct?

Question

Programming

Design-interfaces and design-frontend-mobile applications-api and backend-testing-debugging.

Answer 1

1. Creation of terms of reference - what features are there and how they work.
2. Creation of a private technical task - a detailed description of each feature, feature, behavior and other things (buttons, menus, api calls, etc.).
3. Development of the project architecture under the requirements and limitations of the TOR.
4. Development of architecture at a lower level - modules, subsystems, etc.
5. User interface design and other design.
And then a more detailed development of parts / modules of the project and writing code - independent parts / modules can be done in parallel. Details may vary from project to project - but in general, the logic is something like this.

Answer 2

exchange api and backend with interfaces and design, while there is no server part, everything else is meaningless.
Well, as Dark Hole said , there is no right thing, at each stage you will
do{
add, change, remove,
}
while(final product)

Answer 3

Here are some good answers
. What to do first? Design and interfaces or server development? (backend/API)?