Integrate Custom C# App with Sage

I need a skilled developer to sync my custom application with Sage Accounting. This integration should facilitate seamless communication of Quotes, Invoices, and Contacts with Sage.

Ideal candidates should be proficient in:
- C#, .Net, Javascript, HTML
- Sage Accounting Package
- Integration of Custom Applications
- Data Synchronization

Key tasks include:
- Configuring the integration to ensure all quotes, invoices, and contacts are synced accurately and in real-time.
- Troubleshooting any issues that may arise during the integration process.
- Ensuring the integration is efficient, secure, and user-friendly.

The project needs to be completed within 1 month. The integration will only need to support standard fields.