Event Filter & Queue Routing Service

AWS phone-screen implementation round: an events pipeline emits JSON events; build a service that holds filter expressions and routes each event to the matching output queue. Only a JSON parser helper is provided. Requirements An events pipeline continuously emits events in JSON format. Build a service that holds a set of filter expressions; each incoming event is matched against the filters and dispatched to the corresponding output queue. Only a JSON-parser helper (Java / Jackson) is provided — you design the service structure, the filter-expression representation, and the routing logic. Notes Treat it as an OOD / implementation round, not an algorithm round: model Filter (a predicate over event fields), a Router / Service (holds filter -> queue bindings), and the dispatch loop. Time pressure is the real challenge — a compilable skeleton with clear interfaces scores better than a half-finished perfect design; state extension points (composite filters, default / dead-letter queue) aloud. No execution is required, but write compilable Java; the helper only parses JSON into a node tree whose fields you then read. Preparation Pre-write a small "predicate -> handler routing" skeleton in Java so the structure is muscle memory. Rehearse representing filter expressions (field op value, AND / OR composition) as composable predicate objects.