BigCommerce Data Feed Import Script/Software

I have multiple online stores for different clients, and they all use the same supplier. Our workload is out of control with product updates because we have to manage each store's product line separately. We are looking for a way to take our supplier's Data Feed (pipe delimited format), specify a product range (ID's), and then sync those with a store of our choosing (1 of 3 clients). We are using BigCommerce for each store, but do not know how to use their API to integrate with our supplier's data feed. Ideally, we would be able to use this software/script with various suppliers, but accomplishing the same thing. Using CSV bulk uploads is entirely too wasteful of time, and only worked for us for a short while. We need to automate the process of syncing with suppliers. Supplier (Select Supplier) ---> Data Feed ----> Script/App ----> Options (Product range, etc) ---> BigCommerce Store Update (Select Client) Also looking to find someone that can work with us ongoing. We are a small marketing firm in need of an IT genius.