Daar: a UAE property portal with a price estimate on every listing

Buyers and tenants in the UAE see asking prices, but rarely what comparable homes nearby are listed for. Showing an estimate beside every listing needs clean, de-duplicated stock from several agencies whose data feeds look nothing alike.

Location data is less reliable than it looks. A pin in the sea or in the wrong emirate sends a buyer to the wrong place and skews every estimate that uses that listing as a comparable.

Each partner agency connects as its own adapter, so four very different feed formats land in one schema. Collection runs on the schedule and rate agreed with each agency, de-duplicates records that appear more than once, and a quality gate holds back listings without a precise location or a photo gallery.

Every map pin is checked last, against official emirate boundaries, before anything publishes; the most recent run checked 25,400 pins. Estimates compare each home with similar listings nearby, fence out outliers and give recent listings more weight.

Load testing on a staging copy showed where searches became expensive. Caching compressed responses cut server CPU per search from about 113 ms to about 8 ms. A move to a new host took the gap during each deploy from about 85 seconds to about 13 and removed cold starts.