Hi There! 馃憢

My name is Arjen and I am the Manager of Product Development and Chief Lecturer at Hogeschool NOVI. I work on creating the most modern and relevant educational products that we can offer. Through stategic partnerships and attracting the most talented content developers we offer world class education to our students.

In my work as Chief Lecturer for Cybersecurity I focus on teaching students all there is to know about the technical side of Cyber Security. My main areas of expertise are Reverse Engineering, Infrastructure Security and Web Application Security.

Next to my work I am active as an Independent Hacker. I assist my customers in their journey to increase their security posture. I do this through advice, seminars and security assessments. I toot on the fediverse as @credmp@fosstodon.org.

I organize the Dutch meetup for Hack The Box, for which I am the ambassador in The Netherlands. Each month, on the 3rd Wednesday, members of the Dutch cyber security community get together and have presentations, demos and discussion on wide ranging topics. Through this collaboration I have become an Ambassador for Hack The Box.

The views on this site are my own.

Open Universiteit: Software Quality Management

Background I have been working on getting my Master鈥檚 degree in Software Engineering. To do this I have started following courses at the Dutch Open Universiteit. They have a Master鈥檚 program that takes 2 years and you are able to follow it from home. As this is my first post on the courses, I will give some background. As a teacher it is recommended to have a Master鈥檚 degree. As I had a whole lot of work experience my teaching activities were not a problem, but from an overall point of view I was advised to pursue an Master degree....

March 25, 2023 路 3 min 路 Arjen Wiersma

Badge Challenge 3

Original Post During each in-person Hack The Box meetup I have a small badge challenge that will give the first solver of the challenge a price. at the meetup of March 2023 there will be a very nice little challenge to be done as well, a beautiful NOVI hoodie. You can already download the password protected zip archive. The password will be shared during the meetup opening words. The zip archive (sha1: 28e84243c79caefce06f62ba2c5d930de37a3439) Good luck....

March 12, 2023 路 4 min 路 Arjen Wiersma

Deployment Anxiety

Let me tell you how it was to ship a product out to half a million people back in 1999. But before I do that, let me tell you why. Today I talked to one of my students and he mentioned that he was very nervous about a change he was making. He was afraid it would break things and that he would spend the afternoon working through his CI/CD pipeline to resolve issues....

November 16, 2022 路 5 min 路 Arjen Wiersma

Cleaning up after LSP-mode

I use lsp-mode quite extensively. I switched from eglot when I started using LSP more. The beautify of lsp-mode is that it will automatically install language servers as you need them. It also integrates excellently with dap-mode to enable debugging sessions. So, I switched to it, turned off all the information overload and I am quite happy. One thing I do extensively is that I use LaTeX to make my slides for college class slides and class assignments....

November 7, 2022 路 2 min 路 Arjen Wiersma

Should we pay for open source?

As the world is processing the Twitter deal the open source project Mastodon is gaining a lot of traction. The instance that I am on, fosstodon, is run by a small team and is fully funded by donations. Now this may sound somewhat strange; as the twitterverse is blowing up about $8/month for a blue checkmark I would argue that the $8 is better spent supporting open source projects. As developers, security people, and users we rely on a lot of free time and effort from open source contributors....

November 6, 2022 路 5 min 路 Arjen Wiersma

22 years of Emacs

Where to begin鈥 I just watched David Wilson鈥檚 talk called M-x forever - why Emacs will outlast text editor trends. He gave this talk at EmacsConf 2021 which is a conference dedicated to Emacs. The talk made me reflect on my use of Emacs over the last years and then I realized that this year will mark 22 years that Emacs and I have been together. This (probably too long) article reflects on those years and dives into my use of Emacs....

December 7, 2021 路 12 min 路 Arjen Wiersma

Hack The Box Ambassador

For the last 18 months I have organized the dutch Hack The Box meetups. Due to COVID-19 they have all been as a digital meetup, but not less entertaining though. During my time organizing the meetups the Hack The Box organization supports me in various ways; they give me stuff to hand out such as swag or VIP memberships, they help organize speakers for events when we don鈥檛 have one ourselves and they provide me with Hack The Box goodies every once in a while....

September 29, 2021 路 2 min 路 Arjen Wiersma