Matterpoll is a Mattermost plugin that enables users to create and manage polls directly within the chat platform. It provides a slash command (`/poll`) and interactive dialogs for creating polls with options like multi-vote, anonymous voting, progress display, and public add-option. The server-side is written in Go, handling HTTP API endpoints, slash commands, and poll state persistence via Mattermost's KV store. The webapp component, built with React and TypeScript, renders rich poll attachments, a right-hand side card, and handles user interactions. The plugin supports 11 languages via go-i18n and follows Mattermost's plugin development patterns with comprehensive testing and CI/CD. It is a well-structured, production-quality plugin that demonstrates clean separation of concerns, testable interfaces, and localization best practices.