Hospital Staff Shift Scheduling System

I need a focused staff-management module for our hospital administration team that handles one thing exceptionally well: shift scheduling. The application should let me build, edit, and publish rosters, catch double-bookings instantly, and highlight coverage gaps across wards... (Budget: $15 - $25 USD, Jobs: Database Design, Django, Frontend Development, Node.js, NoSQL Couch & Mongo, Python, REST API, Web Development)