Dear,
GIS Consultant/ developer With Over 12 years experiences in Geospatial fields and Web GIS Solution, I can Assure your Support in this Project. I have a strong Skills in PostgreSQL PostGIS( Advanced spatial queries, Martialized view, Spatial Relationship and Measurement Functions), GDAL/ OOGR, Geoserver( connecting to PostGIS, Publishing vector/ Raster data, Styling, GeoWebCache, Vector Tile, WMTS, WMS, WFS etc?
Regarding Front End API: I can build Web Application based to Openlayers, Leaflet, Mapbox and GeoExt
I Look forward to get More details about your Full project specifications.
Budget & Time frame: Will be fixed after receiving full project details
Regards