GIS/Map Frontend Engineer — Property Data Platform (Mapbox GL JS + Next.js) We're building a real estate data platform that visualizes property records on interactive maps. We have a working Leaflet/HTML prototype displaying 56,000+ parcel polygons for a California county (color-coded with filtering and popups) and need it rebuilt as a production-grade Mapbox GL JS application inside Next.js. What we have: Working Leaflet prototype with 56K+ parcels GeoJSON and GeoPackage datasets (parcel geometries joined to property records) Python/geopandas data pipeline producing the source files Cloudflare hosting environment What we need built: Performance & Core Map Migrate from Leaflet to Mapbox GL JS with vector tiles (Tippecanoe or PMTiles) — current build loads raw GeoJSON which bogs down at scale Target: 60fps pan/zoom and sub-2-second initial load with 50K+ polygons Color-coded parcel polygons with toggleable schemes (by dollar amount, property type, year, status) Interactive popups with property details (ID number, address, dollar amounts, zoning, status) Map controls: basemap toggle (satellite/street), county boundaries, fullscreen, zoom-to-parcel Filter Panel & Search Sidebar with real-time filtering by dollar amount range, property type (residential/commercial/vacant), year, assessed value, acreage, and status — filters update the map instantly Search by parcel ID or street address with auto-zoom and popup Spatial Analysis Tools Click a parcel → highlight all matching properties within a configurable radius Adjacency detection: identify matching parcels sharing a boundary with the selected parcel Drawing tools: user draws a polygon, gets aggregate stats for everything inside it (count, total dollar value, average assessed value) Multi-Region Scaling Scale from 1 county to multiple counties across multiple states with a state/county selector and lazy-loaded tiles per region Architecture must support adding new states and counties without code changes — just drop in new tile files and config Document the tile pipeline so our data team can onboard new regions independently Mobile Collapsible filter panel, touch-friendly popups, usable on tablet and phone Technical Stack: Next.js 14+ (App Router), React 18+, TypeScript preferred Mapbox GL JS v3 with vector tiles Tippecanoe, PMTiles, or equivalent tile pipeline Cloudflare Pages deployment (must work with existing Cloudflare setup) Tailwind CSS for styling Will consume a Supabase/PostGIS API built by a separate backend developer Required Experience: 3+ years with Mapbox GL JS or MapLibre GL JS Demonstrated experience rendering 10K+ polygons with smooth performance Vector tile generation (Tippecanoe, Martin, or similar) Strong Next.js/React component architecture Familiarity with GeoJSON, GeoPackage, and Shapefiles Nice to Have: PMTiles on Cloudflare R2 experience PostGIS spatial queries Real estate or property data background Map box expert