Worked on the Zimbra/zm-mailbox repository to deliver a performance-focused enhancement for chat configuration startup. Developed a new local configuration flag, proxy_chat_config_enabled, enabling conditional loading of chat configuration during proxy startup to reduce startup times in multi-domain environments. The solution involved backend development and configuration management, utilizing Java and properties files to ensure maintainable and traceable code changes. Emphasized backward compatibility and prepared the feature for QA validation across affected domains. The work addressed the need for scalable startup processes, aligning with tracked requirements and demonstrating a methodical approach to system administration and feature flag implementation within the codebase.