Developed and enhanced authentication and credential management features across the transformerlab-api and transformerlab-app repositories, focusing on secure integration with Hugging Face and WANDB services. Implemented a dedicated logout API endpoint with robust token cleanup and comprehensive testing using Python and TypeScript. Improved user experience in application settings by enabling input, saving, and visibility toggling for Hugging Face tokens, along with error handling and login feedback. Introduced a modal interface for managing API credentials and integrated WANDB API key workflows. Standardized all settings-related API calls to use authenticatedFetch, ensuring consistent, secure external requests and maintainable code across React-based frontend components.