Software Engineering - A Hacked Approach
I'm now gonna show you how to develop an app that you can develop with a minimum effort and get maximum results.
Whenever you embark on a development work consider where you are gonna deploy it, the technology that you will use, the budget that you can afford and the project plan to develop the app with least time possible
Always consider existing programs available on github to reuse.
Plan it out how you are gonna prioritize the use cases.
Become an expert in the language and framework to be used.
Do as much as reuse possible.
You don't need intensive analysis to develop what you want. MVC is sufficient enough to give a structure to your app.
Remember an app developed with minimum effort won't cost you much even if the project does fail for some reason.
Keep it as simple as possible and don't make a mess with complexity. Which is a known principle of SE.
I would suggest using python, django and pythonanywhere cloud.
This way you can buy the cheapest plan and get started to test your app in the market.
Find freelancers who will do marketing of your app and spend wisely.
I call this approach a hacked approach because we are doing reuse, embracing simplicity and developing in least time and putting least effort to test our app in the market and getting a response asap.
A systematic approach is possible even for a small budget app and use this hacked approach for your clients and the client will definitely appreciate you for saving their money.