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Arjen Wiersma

My name is Arjen. I am a Cyber Security Consultant for Scyon. I help organisations with their Application Security, Offensive Security and (Cyber) Business needs. Roles that I like to fulfill: Engineer Manager, Senior Developer (Java), Architect, (C)ISO.

I have been in the software and security industry for almost 30 years and have worked in:

  • Internet providers (Chello / UPC, Tiscali - NL): Java
  • Startups (Personify - USA, eBuddy - NL): Java, Big Data
  • Healthcare and FinTech (Infomedics - NL): Java and dotNet - Managed the IT and Development teams
  • EduTech (NOVI - NL): Managed the development team building in Serverless, Javascript
  • Education (Hogeschool van Amsterdan / NOVI - NL): teaching software security and software engineering courses
  • Cyber Security (Independent): helping organisations with their security posture

I am a member of:

  • NLJUG: The dutch Java user group
  • VERSEN: The dutch association of software engineers
  • OWASP: The OWASP Netherlands chapter

In 2024 I completed my Masters’ Degree. My research topic was BiDE, a language and architecture for the creation of bidirectional diagrammatic editors. In essence a way to modify program text using diagrams and text at the same time, allowing stakeholders of different backgrounds to work on the same system at the same time. I worked on this thesis with Bastiaan Heeren (Open Universiteit) and Jurgen Vinju (Centrum Wiskunde en Informatica).

In my spare time I love to explore the cutting edge of software engineering, exploring new languages such as Rust, Clojure and Golang in combination with Large Language Models and their novel applications.

I toot on the fediverse as @credmp@fosstodon.org and on @arjenwiersma.nl on Blue Sky.

Find my longer form writings in the Writing Category.

The views on this site are my own.

Recent posts

  1. The Dutch are WEIRD, and so is ChatGPT

    Series note
    In this post I explore a new paper in my series of Research Driven Blogs .

    I’m Dutch, and whenever I’m abroad, people figure this out pretty quickly. It’s usually the bluntness. We tend to be direct, to the point, and question things constantly. To a lot of people, this comes across as… well, weird.

  2. Your Own Cloud

    Over the last couple of months there is a lot of activity in Europe when it comes to moving out of the American cloud. This move is called Digital Autonomy, and there are a lot of articles on it, but I like the ones written by Bert Hubert.

    When I am working on my own projects, or this website for that matter, I am using Github (which is owned by Microsoft). For some projects I use Gitlab, which was started in The Netherlands, but has now become an American company. Much of my development infrastructure is tied to American companies, simply because they offer the best tools for the job.

  3. AI Can Write Code, But Can It Secure It?

    You can’t scroll through a tech feed these days without bumping into a hot take on AI and coding. Depending on who you ask, it’s either the greatest productivity boost in history or a security dumpster fire waiting to happen. Opinions are cheap, which is why I prefer to stick to the data from actual research. That way, the information is verifiable, and you can trust the analysis because you can check the sources for yourself. This style of writing I call Research Driven Blogging .

Recent notes