Recommend a real-world business problem



Can experienced people suggest me few problems which require end-to-end Data Science knowledge?
Also provide the workflow of solving the problem. I want to know how they do solve real-world business problems in the industry. And it would be very helpful if told how much time does it takes, the amount of resources, the complete problem description, how client expects the solution, in what way the solution is provided and what and how much knowledge is required to solve the problem.

From scraping/collecting/finding data to building models and deploying them, the problem should require me to include all the steps (not like ML competitions). It should challenge me on many levels.
It would be better if the problem resembles the problems handled by startups.
Thanks and have a nice day.