I don't know what voting in California is like, but here in Austria we have election districts ("Wahlsprengel") with just a few thousand voters each. For every

I don't know what voting in California is like, but here in Austria we have election districts ("Wahlsprengel") with just a few thousand voters each. For every district there are volunteers who observe the election and count the votes. It's all counted by hand. It doesn't matter how many voters there are, you can always count by hand, you just divide and conquer.