Web To-Do App with Auth

I need a clean, responsive web-based to-do application that lets users create, edit, and reorder tasks by priority. A simple email / password sign-up and sign-in flow is a must so people can keep their lists safe and accessible from any browser... (Budget: $250 - $750 USD, Jobs: Backend Development, Django, Frontend Development, HTML, JavaScript, Node.js, Vue.js, Web Development)