Convert Shapefile to Geojson

I am in need of a programmer who can start working ASAP to write a script that will convert a shapefile to GEOjson. I wish to be able to convert many different shapefiles eventually. The shapefile is constantly changing so I will need output to be converted on demand. I will be downloading and storing the shapefile every hour. I will need a script that will call the shapefile and convert it to geojson so that I can use it to create maps. Any already available script will work for this project as long as we can call any shapefile and get geojson response. Please contact chat with questions. We want to work with someone who can start this project immediately or has a very clear vision of how this can be accomplished. The script can be written in either PHP or other languages as long as it can create the geojson folder on the fly.