Fan-Out / Fan-In Concurrency Flow

A workflow pattern where a coordinator splits a large job into multiple parallel sub-tasks (Fan-Out), and collects and merges the results once completed (Fan-In).

STAFF ENGINEER TAKEAWAY: Reduces latency of parallelizable jobs from O(N) to O(1) (the duration of the slowest single sub-task).

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More Topics in 5. Messaging & Events

📬Message Queues (PTP Asynchronous Buffering)

Point-to-point asynchronous buffers where producer services enqueue jobs, and competing consumer workers process tasks at their own decoupled pace.

📢Publish/Subscribe Event Streaming

Publishers broadcast events to topics without knowing who the subscribers are. Multiple independent consumer groups read from the same topic simultaneously.

⚡Event-Driven Architecture (EDA)

Systems coordinate state changes through state-change notifications and events rather than synchronous request/reply HTTP/RPC calls.

📐Domain-Driven Design (DDD) & Bounded Contexts

Divides large software domains into discrete logical boundaries where ubiquitous language and domain models are strictly defined and isolated.