Backend/API Developer for Webhook Automation

I am building a banking prototype called ProfitFlow, based on the Profit First cash allocation method. I need a backend/API developer to complete a short proof-of-feasibility using the Column Bank sandbox API. The goal is simple: prove that when a deposit lands in a Column sandbox Clearing account, a backend webhook listener can automatically route the funds into five internal bucket accounts using Column book transfers. This is a sandbox-only technical validation, not a production build. The manual workflow has already been tested successfully. A test ACH deposit was received into the Clearing account, Column delivered a webhook, and manual internal book transfers from Clearing into the five bucket accounts were completed. The remaining task is to prove that the transfers can happen automatically through a backend service.