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Build once.
Swap anything.

Your business logic shouldn't care whether it's Postgres or Mongo behind it. Write it once against contracts, then plug in any database, queue, or cache — without touching a line of domain code.

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No vendor lock-in Type-safe contracts Testable by design
app.py 
# Business logic depends on a contract, not a vendor
class PlaceOrder(Handler):
    orders: OrderCommandPort
    items: OrderItemCommandPort

    async def __call__(self, args: OrderCreateArgs):
        order = await self.orders.create(args.metadata)
        items = await self.items.create_many(args.items)

        return order.id

# Swap infrastructure — domain code never changes
runtime = build_runtime(PostgresDepsModule(...))
Plug into the infrastructure you already use