Hej! I'm Oskar Rough Mosumgaard

Design, music and web technology. I can help you build things, mostly on the internet. Tools that last, software you can change.

Contact me at oskar@rough.dk, Mastodon or Matrix.

Listen to my radio, one big list of songs I've enjoyed since 2013. You can create your own → Radio4000.com.

… and here are some of my projects:


A radio for the year 4000. A music player and radio service for your listening pleasure. Made with Internet4000. Check the source code.

Dansk Dynamit

A network between Danish designers, architects and creatives offering ideas, discourse, jobs and workspaces. Since 2007. Still active, but on life-support since ~2015 or so.

Slay the Web

Slay the Web is a singleplayer, deck builder, roguelike card crawl game for the web based on Slay the Spire


Real recognize real. Hyper-stimulated downtime, a curated online video channel. Strrr fuses the ease of use of classic TV with the best of the internet. A platform where we had the pleasure of creating six seasons of interviews with so many good people.

Screenshot from strrr.tv episode page

Alive Festival

A cozy, yearly and very fun music festival located in my homearea Thy, Denmark. Forever growing since its beginnings in 2009. I left it in good hands in 2014. Now it's 2023 and it's still going!

Alive Festival 2009 Alive Festival 2010 Alive Festival 2011 Alive Festival 2012 Alive Festival 2013

Ooh Games

A collection of prototypes of games I made. The source code is on my Git.

Codes & Notes

A guide for anyone wanting to learn more about web development. A no-longer work-in-progress collection of my personal codes and notes.

Unicorn Workspaces

In 2019 I joined Unicorn as CTO and have been trying to make workplaces across Germany a bit nicer since then.

Open Source

I maintain several community projects such as media-now, Radio4000, ember-youtube, ember-date-fns and ember-wordpress and the rough boilerplate. The source for Codes & Notes is also available.

Lobeckstr. 36

From 2010 to 2016 I worked with HOPE/GLORY and Kopfwelt in a space alongside Metrofarm and Noshe. Some sites we did: