Experience with Message Brokers (Kafka) and contract testing.

Message Brokers, such as Kafka, are used for asynchronous message exchange between services, ensuring high performance and reliability. In QA Automation, experience with Kafka includes setting up test environments, verifying the correctness of message publishing and consumption, as well as testing error handling and recovery scenarios.

Contract testing in the context of Message Brokers helps ensure that the producer and consumer of messages agree on the message format and content. Typically, tools like Pact or custom schemas are used to verify that messages conform to predefined contracts.

Example: when testing a service that publishes events to Kafka, you can write a test that:

• Subscribes to the relevant topic.
• Sends an event.
• Checks that the received message matches the contract (structure, field types).

This helps prevent integration errors and mismatches between services.