Ask HN: Simple Two Sided Marketplace Model

Hi – I am trying to solve a problem I am experiencing at work. Essentially I need a simple solution that 1. allows for stakeholders (in our case managers, or others it could be a customer) to place a request for a niche service 2. I would then like that niche service request to get pushed out to a pool of vendors that we've vetted to be able to perform x niche service. There are obviously other logistics such as paying the vendor after etc and on-going booking management but I can't seem to understand why such a product doesn't exist. I've seen things like ShareTribe and Launch27 but nothing that is as simple as this. I almost envision an intake form sheet --> pumped into Trello --> alert pool of people if a card hits within a certain list --> allow the person interested to claim and complete the job --> payment issued.

Does anyone know of such a simple service marketplace? Many of the options out there overcomplicate this.