This may be obvious, but we’ll mention it anyways — evaluate tools extensively before purchasing.
This is a service-based architecture that you’re transitioning into, and the effectiveness and stability of the system is going to rely on having tools and services in place that can serve you and your unique and complex needs.
While this composable movement has been groundbreaking, remember that it began initially to serve small and medium sized sites. And because it lowered the barrier to entry into building websites, there is a vast number of developers using this pattern, many of whom are building exclusively hobby projects.
As a result, while there is what seems like an endless number of choices for various tools and services, not all are built for enterprises. In fact, very few actually are. Even those that say they offer enterprise services may not be equipped to handle the challenge.
Most products available today will offer some sort of enterprise trial period at low (or no) cost, depending on the work they have to do to support your evaluation.
We typically recommend you do two things when evaluating a product for your stack:
Ask for a free or low-cost enterprise trial. This will show you if the experience is actually different for enterprises.
Put the tool up against your scale, or some version of it, as much as possible. This will show you that the tool can flex to your needs. It’ll probably be immediately obvious if it can’t.