a1ioth.net

Hi, I'm

Yuheng Cao.

A developer in the Amsterdam area.
I mostly work with C# and .NET.
Here's what I've been building.

Line map of every neighbourhood boundary in the Netherlands, with Amsterdam highlighted
Amsterdam52.37°N 4.89°E
Fig. 1  Every neighbourhood in the Netherlands, as mapped by where2live.Map data from CBS and Kadaster (CC BY 4.0), simplified.
50 km
My project2026
Live since July 2026

where2live.app

I wanted to know how safe my neighbourhood was. So I built a way to explore the data.

467,000 postcodes across 18,500 areas, refreshed monthly. 5,000 users and paid orders in the first month.

Explore the project
The where2live map showing neighbourhood safety data in Amsterdam
Fig. 2  where2live, searching postcode 1083CD.
  1. Postcode search
  2. Safety rating per neighbourhood
  3. Police-recorded crime, by month
  4. Each neighbourhood graded on the map

Built and run independently. Public crime and nuisance data, an interactive map, and paid area reports.

C# · ASP.NET Core · EF Core · SQLite · React · TypeScript · Docker