Geocoding

Hello!

I have thoroughly reviewed your task. The problem is familiar — I have encountered something similar when working with OSM Nominatim and Mapbox. Here is my vision:

Why objects "fly" to foreign markers:

Nominatim returns the centroid of the nearest found object, not the exact address. If the address is not found at the house level — it "jumps" to the center of the street, district, or even city. This is your 15% errors.

The problem with the geocoding pyramid — the classic fallback house → street → district → city requires validation at each level. It is necessary to check the importance and class/type in the Nominatim response, rather than just taking the first result.
…
Districts without polygons — I agree, drawing manually for each city is unrealistic. Solution: use administrative boundaries from OSM (relation boundaries, admin_level=9-10) or GeoJSON districts from open sources (data.gov.ua has boundaries for most cities). This will provide point-in-polygon validation without manual work.

My plan:

Audit the current pipeline: I will look at how exactly the fallback works and where accuracy is lost.
I will add validation by bounding box and type from Nominatim — filtering out "broad" results.
I will connect reverse geocoding for cross-checking (coordinates → address → comparison with the original).
For districts — I will pull OSM boundaries through Overpass API or ready GeoJSON, and perform point-in-polygon.
I will set up a confidence score: each result will receive an accuracy rating, so you can see where there is a 100% match and where manual verification is needed.
Result: 95-98% accuracy instead of the current 85%.

I have experience with Nominatim API, Mapbox Geocoding, Overpass API, Turf.js (geospatial operations), PostGIS.

Deadline: 2-3 days
Price: 5000 UAH

I am ready to discuss the details and take a look at the current code.

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Hello! Your project looks very interesting. I am ready to start working immediately and ensure high quality.

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This is a typical story where the geocoder works "by line" without strict limitations and without checking against polygons. To estimate the volume and timelines, details are needed: Geography and which specific "districts" (level). Input data format: separate fields or one line. Examples of 5–10 problematic addresses + what Nominatim/Mapbox currently returns. Expected output: point, address, district, city, additional fields. Limitations on stack and infrastructure. If you want, I can audit the current pipeline and suggest a fix with tests on your set of cases.

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