Just tell people "I write software for x" where x can be anything. Teachers, government, hospitals, dogs, whatever it is. In my case it's "lawyers". You don'

Just tell people "I write software for x" where x can be anything. Teachers, government, hospitals, dogs, whatever it is. In my case it's "lawyers". You don't have to go into any more detail than that. Anyone who really cares will ask followup questions or say something like "oh you should talk to my brother, he's a lawyer".