Cross-Platform Productivity App Builder

I need a developer to turn my concept for a desktop productivity suite into a polished, install-ready application that runs on Windows, macOS, and Linux. The core of the project is to blend three features—task management, rich note-taking, and calendar integration—into a single, intuitive interface so users can plan, capture ideas, and schedule without hopping between programs.

My priority is a smooth, native-feeling experience on all three operating systems, so a cross-platform framework such as Electron, Tauri, Flutter, or similar will likely make sense, but I’m open to other approaches if you have a better technical path.

Key deliverables
• A functional desktop app with the three features seamlessly connected (tasks, notes, calendar)
• Cross-platform installers or packages for Windows, macOS, and Linux
• Clean, well-commented source code stored in a Git repository
• Brief user guide and build instructions

Acceptance criteria
• All three feature areas load quickly and sync data locally without crashes or obvious memory leaks
• UI feels consistent across operating systems, with native menu shortcuts respected
• Calendar connects to standard .ics or common online calendars through an API you recommend
• Tasks and notes can be exported to plain text or markdown

If you have prior experience shipping cross-platform desktop tools and can demonstrate it, I’d love to review your portfolio alongside a proposed timeline and tech stack.