Jan Ahrens

Engineering Leader

Recent Posts

Heroku with C

6 minute read

Whenever I want to know my external IP address, I use ifconfig.me. It’s a small service that returns your IP address along with some additional information. ...

Backups with Tarsnap

4 minute read

I recently switched from local to online backups with Tarsnap. In this post I want to share what I think is great about Tarsnap and how I configured it.

Threema protocol analysis

less than 1 minute read

I analyzed the custom protocol used by the mobile messaging application Threema and wrote a paper to summarize my results.

FizzBuzz in Emacs

3 minute read

I’ve been playing with GNU Emacs and implemented the FizzBuzz Kata. In this post you can read about my approach.