Worked on stability and modernization across the gptwrapper and sis-importer repositories, focusing on backend and infrastructure improvements. Upgraded Node.js runtime in Dockerfiles for gptwrapper, then rolled back to maintain compatibility after encountering issues. Enhanced sis-importer by consolidating NATS connectivity, introducing explicit port handling and environment-based configuration for reliable messaging. Modernized the codebase through dependency cleanup, updating the Redis client, and refining date handling. Upgraded the database migration framework to Umzug v3, with infrastructure rollbacks to ensure system stability. Utilized JavaScript, Docker, and YAML, applying skills in containerization, configuration management, and DevOps to deliver robust backend solutions.