Worked on enhancing observability and reliability for notification services within the companieshouse/chs-notification-kafka-consumer and chs-notification-sender-api repositories. Introduced structured logging throughout the notification stack, focusing on detailed exception and message tracking for both WebClient and Kafka interactions. Improved error handling and encapsulation in KafkaConsumerService to reduce log duplication and protect sensitive information. Expanded and refactored test coverage for notification flows, emphasizing maintainability and validation of API responses. Leveraged Java, Spring Boot, and Kafka, along with JUnit and Mockito for robust integration and unit testing. These efforts resulted in a more observable, maintainable, and testable backend codebase.