Drupal Developer with experience on data read/writing3

Looking for Drupal developer with experience on data reading and writing to and from Drupal. Data reading is to read external data of variety format Excel, JSON, text.... into Drupal content of variety of content type, paragraph.... Data writing is to write Drupal content into file in variety of formats, Excel, JSON, text... The data/file can be big, and need use method, like streaming, to handle the input / output.