Profile for joern

Display name
joernchen :cute_dumpster_fire:
Username
@joern@threatactor.club
Role
admin

About joern

Bio

Your mom's favorite hacker!

My other account is @joernchen

Stats

Joined
Posts
687
Followed by
1129
Following
261

Recent public posts

exclude boosts
joernchen :cute_dumpster_fire: , @joern
(open profile)
Boost of @hailey@hails.org
Hailey , @hailey@hails.org
(open profile)

I'm open for Ruby on Rails contract work in 2025!

I'm an experienced systems and performance engineer with deep knowledge of Rails and the Ruby VM, and I have code committed and CVEs credited in both projects. I am also highly proficient with web tech, databases, and Linux systems.

I've worked at every layer of the stack from kernel to browser frontend, and I'm comfortable with cracking open the code to answer questions the documentation doesn't.

From 2013 to 2018 I worked on systems and performance at GitHub, where I led efforts to upgrade the main Rails app from Rails 2.3 to 3.2 (old heads know) and from Ruby 1.9 to the 2.x series.

I'm based in Melbourne, Australia and am experienced and comfortable working remotely, however I am also open to hybrid arrangements if you're local.

Available for immediate start on short-to-mid-term contracts. DM here, or reach out via email at hailey@hails.org.

boosts appreciated :)

joernchen :cute_dumpster_fire: , @joern
(open profile)
Boost of @freddy@security.plumbing
Frederik Braun � , @freddy@security.plumbing
(open profile)

To all Hacker Spaces in Berlin. I have a decommissioned server to give away. So far, I have been unable to find a beneficiary.

**Who wants this server?**
HP ProLiant DL360 Gen9 - 2 CPU E5-2697 v3 @ 2.60GHz, 128 GB DDR4, 2x 900GB SAS.

Pick-up in Berlin Kreuzberg.

(You can stop boosting now :))

Happy 2025 everyone!

Last year for me wasn’t especially great. But it had a few highlights standing out:

  • Took the risk and went on an adventurous camper trip with the family

  • Got promoted at work and in BJJ

  • Had the chance to be behind the DJ decks again on two occasions

  • Got to meet most of my teammates in person finally

For 2025 I hope the medical problems in my family can finally get on a route to be resolved.

joernchen :cute_dumpster_fire: , @joern
(open profile)
Boost of @G33KatWork@infosec.exchange
Andy , @G33KatWork@infosec.exchange
(open profile)

Does anybody have a tap for a keg of beer (10l, DIN 6647-1) with them? Maybe a top vent as well. We Cologne people have beer, but no way to get it out of the keg.

If you can help us out of our misery, that would be great. And you'll get beer! 🍻

edit: We got a set! There will be beer at some time (most likely tomorrow).

joernchen :cute_dumpster_fire: , @joern
(open profile)
Boost of @michenriksen@chaos.social
Michael Henriksen , @michenriksen@chaos.social
(open profile)

I've been working on a client-side web app to inspect and analyze arbitrary data.

It's like a lightweight CyberChef that automatically builds recipes by recursively detecting and unpacking layers of encoding and compression.

It also lets you select specific parts of the input with your cursor to focus the inspection, which is neat when analyzing data that consists of multiple parts, or for skipping non-data prefixes and data separators.

michenriksen.com/inspectra/

joernchen :cute_dumpster_fire: , @joern
(open profile)
Boost of @freddy@security.plumbing