ARCGIS development

I have been provided by a client with a map https://naturalengland-defra.opendata.arcgis.com/datasets/Defra::living-england-habitat-map-phase-4/explore?location=51.492335%2C-0.075396%2C16.00 and asked to build an API that receives an array of coordinates and returns an array of features. I’m looking for a developer who could advise me on how to achieve this provide a full demonstration and also provide guidance on costing