Website development and API development obtaining requests from an XML database

Need someone capable of developing an API that is able to make post and get requests from an XML database. You may use your choice of language when developing the API. API needs to then be attached to website that has front end and backend access from admin. I Will supply example documents, THESE ARE BY NO MEANS something that how the API needing to be built is accessed just simply examples. Please message me for further details.