During September 2025, Tung Nguyen developed the MMN Development Environment Connectivity feature for the nccasia/mezon-fe repository, focusing on configuration management using environment variables. He updated the chat application's .env file to specify development URLs for MMN, Indexer, and ZK backend services, ensuring the frontend reliably connects to the correct endpoints during local development. This work addressed environment drift and improved onboarding by standardizing configuration across services. Although no bugs were fixed during this period, Tung’s contribution enhanced code traceability and collaboration between frontend and backend teams, leveraging skills in configuration management and environment setup with env files.