Google App Script is mandatory.
Google Spreadsheet as user interface, master data also in Google Spreadsheet,
create a timebased(scheduled) script to run a reminder and send an email as reminder.
create in Google Calendar based on the schedule in the Google Spreadsheet.
the details shall be shared after shortlisted.
Dear Sir or Ms.
I am John, pleased to meet you.
I'm well experienced in Google Apps Script and G Suite.
Please, take a look at my portfolio in my profile.
May I find out many details about your project ?
Thank you for your time !
John
I have been working on Google app script for last 6 months. I have worked on a similar project in past. Therefore I am sure I can provide you with a well structured and dynamic code for your project.