Real Time Systems and Messaging Questions

Evaluate design patterns and operational concerns for real time features and message driven architectures. Topics include realtime notifications messaging systems event streaming and use of message brokers such as Kafka or RabbitMQ partitioning ordering idempotency and delivery semantics including at least once and exactly once considerations. Candidates should discuss event schema design versioning backpressure and flow control testing and monitoring strategies eventual consistency conflict resolution and scaling trade offs around latency throughput and operational complexity. Practical approaches to implement websockets server sent events and integration with backend pipelines should be covered.