How do you manage end-to-end digital product projects?

I have been examining how teams develop and implement a digital product project from beginning to end. It’s interesting the way each team approaches it a little differently depending on team size, product objectives, and internal framework. Some teams strongly favor agile frameworks, while others are a little more traditional, or some teams may even utilize a combination.

I recently read a useful breakdown of a digital product development service that explains how each phase connects, from idea validation to product launch. It highlights how coordination between designers, developers, and strategists can make or break a project’s success.

I’m curious to know how others here structure their workflows. How do you keep communication smooth between design, development, and testing teams, especially on complex builds? Do you have any tips or lessons learned from managing cross-functional collaboration?