Most developers think of Oban as just a background job library. That's like calling a distillery a warehouse. The real power? The master-slave coordination baked into its DNA. We've spent years running high-throughput systems across multiple locations, and I'll tell you this: Postgres-backed queues without proper leadership election are a nightmare waiting to happen. Let's … Master Slave Oban Architecture: Argyll and Bute’s 2026 Growth Engine