Data Sync Web App

I need to update ASP.Net Core code that facilitates two-way synchronization of my records using API

Key Requirements:
- Develop existing code to accomplish a sync between modules
- Implement two-way synchronization
- Ensure the application code is robust

Ideal Skills:
- Proficiency in ASP.Ner Core
- Experience in Web application development.
- Expertise in data synchronization techniques.

Please provide examples of similar projects you've completed in your proposal.