Don't split into silos
Too many companies separate design, development, copywriting, support, and marketing into different silos. While specialization has its advantages, it also creates a situation where staffers see just their own little world instead of the entire context of the web app.
As much as possible, integrate your team so there's a healthy back-and-forth dialogue throughout the process. Set up a system of checks and balances. Don't let things get lost in translation. Have copywriters work with designers. Make sure support queries are seen by developers.
Even better, hire people with multiple talents who can wear different hats during development. The end result will be a more harmonious product.