Custom Word Processor With Grammar Checks

I’m looking for a developer who can create a lightweight word-processing application that focuses on clean writing and built-in quality control. The project’s core requirement is an integrated spell-check and grammar-check engine that works in real time, highlighting issues and suggesting corrections much like Grammarly or Microsoft Word. I don’t need an entire office suite—just a focused, distraction-free editor that opens quickly and keeps writers in their flow.

Key needs
• Real-time spell and grammar checking with clear inline suggestions
• Basic formatting options (bold, italics, headings, bullet/number lists)
• Open, edit, and save to common formats such as .docx, .rtf, and .txt
• Cross-platform support (Windows and macOS at minimum)
• Autosave and version history so drafts are never lost

Deliverables
• Fully functional executable for each supported OS
• Well-commented source code and build instructions
• Brief user guide explaining features and keyboard shortcuts
• One short demo video or GIF showcasing the spell/grammar workflow

I’m open to the underlying tech—Electron, Python + Qt, JavaFX, or C++/wxWidgets are all fine as long as performance stays snappy. If you have an existing codebase you can adapt, let me know; speed to delivery matters, provided the final build is stable and easy to maintain.