Custom Shopify Integration using REST API and client library

Description

Sorry but this is Europe ONLY!
More details will be provided although an NDA will be required.
We intend to replace an existing Shopify Webhook solution into a Shopify Shipping App using our available REST API client library.
The ideal candidate will have knowledge of Shopify platform and integrations with external systems. Preferably with solid knowledge of the Shopify APIs.
Technology Stack• .NET 9• C#• REST API• SQL (optional)
Please only apply if you have experience (done most of this before) and can offer real guidance