Backend and interfaces: the core of almost every project.
It's the combination most projects start from: you describe the domain, the backend runs it and the interfaces generate from the same declaration. It's enough for complete business applications — jobs, matters, shipments, procedures — and for customer- or citizen-facing portals.
Orchestration isn't needed until you want something to act on data autonomously. Many projects stay here for a long time, and that's fine: AI makes sense once the domain is well described, not before.