SAAS Online Platform For Searching Documents Based On A List Of Queries

I need just the backend software of a website developed that can then be designed afterwards. Perhaps by the same freelancer. The website should be a Software as a service site. The software fundamentally should do the following: - It will search a given file and find if items exist within that file. In order to achieve this: It will need to allow upload or input of a list of items to be found in a document. The user can specify multiple conditions for each input e.g > X amount , on a certain date and matches a description etc. Can take multiple document formats for searching: PDF, Images, Text Documents, Spreadsheets Several documents can be uploaded and included in the same search. The data which is not straightforward to be searched needs to be converted using OCR recognition to a high standard. The user can then sort data from the document into groups of common data, e.g a column for dates, quantity column etc. Searches the document for the given inputs. Outputs a list of found items and items that couldn’t be found. Along with the data to support those found items. Should be an option for close matches also.