Full Stack Developer Needed for Spreadsheet Editor Enhancements

I'm looking for a full stack developer to make several key improvements and integrations to my existing spreadsheet editor.

- **Adding New Formulas:** The first key task is to introduce new formulas to the existing spreadsheet editor. I need a professional who is well-versed in developing and integrating custom formulas to spreadsheets.

- **Improving User Interface:** The editor's current interface needs a major upgrade. Your role will include enhancing the visual design to make it more modern and user-friendly. We also need to simplify the navigation within the editor, ensuring it's intuitive for our users. Drag-and-drop functionality is another key aspect that needs to be integrated.

- **Integrating with External APIs:** The editor needs to be seamlessly integrated with external APIs. In this case, we have a custom API that needs to be incorporated. Prior experience with integrating custom APIs is, therefore, a must.

The ideal candidate for this project will have:

- Extensive experience with full stack development
- Proven track record of working with spreadsheet editors
- Strong UI/UX design skills
- Experience with integrating custom APIs

If you're confident in your full stack development skills and have experience in these areas, I'd love to hear from you.