Senior Browser Extension Developer (TypeScript / React)

We are looking for an experienced developer to build a cross-browser extension supporting Chrome, Firefox, and Safari based on an existing TypeScript/React application. The project includes porting existing features into browser extensions, including text selection, analysis workflows, feedback system, persistent highlighting, context menus, side panel UI, and local database integration. Required skills: Strong TypeScript + React experience Browser extension development (Chrome / Firefox / Safari) Manifest V3 / WebExtensions API experience Content scripts and background services Browser APIs (storage, runtime, contextMenus, messaging) DOM selection, Range API, HTML processing Webpack and client-side database experience (sql.js/SQLite is a plus) Existing codebase and architecture documentation will be provided. Please share previous browser extension projects and your experience with cross-browser compatibility.