Web App UX Design Revamp

I am enhancing an existing web-based application used by building technicians and tradespeople for time tracking and employee scheduling. The current codebase is already up and running, but the user experience still feels rough around the edges... (Budget: $250 - $750 USD, Jobs: Figma, Graphic Design, Prototyping, UI / User Interface, User Interface / IA, UX / User Experience, Web Design, Website Design)