Inventory Forecasting App for Shopify

I am looking for an experienced developer to takeover an already developing project. It's a private app for inventory forecasting in Shopify.

Things we've done so far:
- front-end is partially done - has some bugs;
- inventory data collection - may need more testing;
- aws deployment;
- domain setup;

Things we have to do, in order of importance:
- implement the forecasting algorithm;
- columns addition (inventory level, incoming inventory etc.)
- make the app more visually appealing;

The algorithm contains math, but it's just arithmetic.
In the future we plan to make this a public app.

Do NOT apply if you do not have enough experience creating more sophisticated apps for Shopify.
Do send a portfolio of your work.

We can discuss pay & timeframe afterwards.