I work for a chain of small stores with a "developed" delivery system. The thing is, ship-from-store is something that is used but super poorly implemented. Where can we find people that will offer custom or existing software solutions to our problems?

I was in pretty much the same situation, and after everything was optimized, the atmosphere of endless mess and rush disappeared. I won't list all the changes and all the fixes that were executed but I can recommend the developers that we hired. Here, check this link https://www.griddynamics.com/solutions/supply-chain-optimization . And they charge relatively low. So I hope it helps you.