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I am looking for an experienced Shopify developer to write an app that can calculate shipping rates by post code - see this chart for more information.
The above PDF shows the chart for items shipped from Adelaide to various places around Australia.
The app will need to take the customers post code, check that against the data to decide the 'zone', then calculate the shipping based on weight.
In total there are 15 different 'sending' charts, see here. http://auspost.com.au/products-and-services/easy-guides.html?cmpid=foot-p1-l5-postage-rates
The developer can choose whichever programming language to build the application in. I have no preference, however thought should be made towards being scalable for use by many users at once.
If you have any questions, please ask and I'll be happy to answer and clarify.