Neighborhood Finance

A static loan-eligibility map. Zones live in GeoJSON and a JSON manifest, deployed by GitHub Actions.

Neighborhood Finance Corporation needed a map of loan-program boundaries for Des Moines and Cedar Rapids. I led a four-person team. The site is static: Leaflet, GeoJSON polygons, address search, and a mapping file staff can edit without an engineer next to them.

Problem

Eligibility depends on which polygon an address falls in, and the polygons change. A hand-maintained map was expensive, and the people who knew the zones were never going to maintain an app.

Process

Polygons stay in GeoJSON. A mapping.json manifest names each zone, points at the file, sets its color, and can hide a layer. A query flag switches the program variant. Search uses Leaflet GeoSearch, and GitHub Actions publishes the site. I wrote the maintenance docs: add a zone, cut a hole, rename, revert.

Solution

• Leaflet map on OpenStreetMap tiles, GeoJSON loaded at runtime and styled from mapping.json.
• Address search and a switch between Des Moines and Cedar Rapids.
• GitHub Actions deploying a static site, with documentation so staff can edit zones in GitHub.

Results

• $100K+ Saved for the client each year
• 4 Person team
• 0 App servers to operate
• 2 Cities on one map

Justin Moran · Software Engineer · Chicago, IL · LinkedIn · GitHub · Resume (PDF)