Hello,
I'm an experienced GIS developer and I have completed many related projects:
- applications: QGIS, PostGIS, Google Earth
- file formats: GeoJSON, Shapefile, KML, GPX
- libraries: shapely, pyproj, fiona, rtree
- mapping platforms: Google, OSM, Here
Handling a 60 MB file shouldn't be an issue; if you can upload the file I can take a look at it. If your application also supports other file formats (for example SHP) I could convert the file for you.
Best wishes,
iticus