Complete and Deploy iOS App with PLSS Integration

I have an existing Expo (React Native) iOS app that is mostly complete. The UI, navigation, and legal description parsing are done. The remaining work is accuracy-related.

The app currently uses synthetic, mathematically generated PLSS coordinates. I need this replaced with authoritative Nebraska PLSS polygons so results are accurate across counties.

Scope (Nebraska only):
- Set up a PostGIS database
- Obtain authoritative Nebraska PLSS quarter-section polygons from government/open sources (CadNSDI / BLM-derived)
- Import PLSS data into PostGIS with correct CRS/SRID
- Build backend APIs:
1) Search by legal description (quarter, section, township, range)
2) Identify parcel by lat/lng using point-in-polygon
- Return GeoJSON (EPSG:4326) to the app
- Replace the synthetic grid with backend results in the Expo app
- Build and submit the iOS app to TestFlight / App Store

Important notes:
- Nebraska only (no nationwide expansion)
- No owner/tax data required
- No offline downloads required
- Accuracy is the priority (county, section, quarter must be correct)
- PostGIS / GIS experience is required

Budget: $3,000 fixed
Timeline: 3–5 weeks