Bart van Zon Software developer


I'm a Vienna based software engineer with a focus on backend development using both Ruby and Elixir. With a history in promotional and telecom applications I have an expertise in scaleable applications.

For Hire

I'm available for hire on location in Vienna, Austria or remotely anywhere in Europe. More details about projects I've done in the past can be found on LinkedIn, or you can reach out to me for more info via e-mail or phone.


My main development languages are Ruby and Elixir, but I have worked with JavaScript, PHP and more.


Docker, Git, Linux, Photoshop, Vim and many more.

Switching Postgresql on a Mac

Earlier today I decided to switch from to a simple homebrew install of postgresql. Not because I’m not satisfied with the app but I think it’s just a bit overkill to start up a database. Together with the lunchy gem (a launchctl wrapper) I found yesterday switching should be a piece of cake. So I threw in the trashbin. Entered brew install postgresql and everything was supposed to be unicorns and rainbows.

However I kept getting this error when trying to interact with the database via Rails:

could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"?

I had absolutely no clue where to look but after a while of messing around I figured it out, the pg gem I use with Rails was installed with the old Postgresql installed. And now I switched databases it couldn’t connect anymore. The solution is simple, just uninstall the pg gem and reinstall it.