Worked on the SimonRichardson/juju repository to deliver DNS entry deduplication for Juju container NICs, addressing issues with duplicate nameserver entries in network configurations. Utilized Go for both implementation and comprehensive unit testing, ensuring that the deduplication logic reliably prevents redundant DNS entries and maintains clean, consistent configurations. Enhanced the fallback path for container NIC DNS settings by adding safeguards against appending existing nameservers, which reduces configuration drift and improves reliability. Prepared detailed unit tests and documentation to support future maintenance and code clarity. The work focused on network programming best practices and contributed to more robust DNS management in Juju.