Automation for Excel file

I'm in need of a freelancer to help me automate a specific excel file and will require advance excel skills (VBA & Macros) . The project is for personal use and the specific task I need help with is performing calculations/formulas. The automation should be set up to be compatible with the latest version of Excel. Additionally, I would like it to have as few errors as possible and to be efficient so that the file runs quickly. If you can help me create an Excel file that is accurate, efficient, and compatible with the latest version of Excel then please reach out.