A message-oriented architecture developer designs and implements systems where communication between components is done via message passing. They work in a distributed environment where components interact asynchronously, reducing system bottlenecks and enabling scalability. They define message formats, protocols, and sequences to ensure reliable data transmission. They also handle message queuing and delivery, ensuring fault tolerance and system resilience. They deal with issues related to concurrency, synchronization, and network failures. They usually work with Message Oriented Middleware (MOM) like RabbitMQ, Apache Kafka, and also use languages like Java, C#, and Python.