Worked on notification platform enhancements across the companieshouse/chs-notification-kafka-consumer and chs-gov-uk-notify-integration-api repositories, focusing on reliability, scalability, and security. Improved letter processing strategies and observability using Java and Spring Boot, while refining logging and timeout handling for robust transactional workflows. Leveraged Terraform and AWS ECS to optimize deployment scaling and resource allocation, introducing scheduled scaling in chs-notification-sender-api for cost efficiency. Addressed security vulnerabilities by updating Tomcat dependencies and implemented MongoDB transaction support to strengthen data integrity. Maintained high code quality through expanded unit testing, SonarQube-driven improvements, and configuration management, resulting in more maintainable and resilient notification services.