Worked on enhancing shutdown reliability and message integrity in the spring-amqp repository, focusing on backend development with Java and RabbitMQ. Addressed a critical bug by enabling reliable ACK processing during consumer shutdown, allowing acknowledgements to be committed within the ShutdownTimeout window. This approach ensured that outstanding messages were properly acknowledged even when a consumer was cancelled, reducing the risk of message loss and improving overall message durability. Demonstrated skills in concurrency control and lifecycle management by refining ack and commit semantics under shutdown constraints, resulting in more predictable consumer behavior and strengthened shutdown patterns for message queue applications.