T-DOSE 2025

Having started with Linux in 1995, Andreas did a lot of network and linux consulting in his life before eventually joining the Bareos project in 2019 where nowadays he improves the software and makes users and customers happy.

Arnout (@raboof@merveilles.town) is a NixOS committer, active at Hack42, window manager maintainer, Reproducible Builds advocate, freelance software developer, Security Response @ Apache Software Foundation, and generally living and breathing open source.

Bestuurslid van Freie Software Freunde
Gast op vele evenementen voor Vrije Software
Eigen projecten: Stricktux en Freedom Tours

Boekenwuurm is a purple-loving physicist, who spends her free time in hackerspaces. She wants to make cool things for hackers to enjoy. She hangs out at Hackalot, the hackerspace in Eindhoven, that she helped build. Her latest endeavor is a summer camp in the Netherlands.

Darko Fabijan is CTO of Semaphore, a leading CI/CD platform, and host of the Semaphore Uncut podcast. With an extensive background in DevOps and cloud-native technologies, he has led development teams to automate pipelines and deliver software at scale. Darko frequently shares his expertise at conferences worldwide, helping organizations optimize their software delivery workflows and embrace continuous improvement.

It professor for 25 years

Esmeralda Tijhoff is a Product Manager and Open Source Officer at Dictu with a background in IT service management, project management, and business analysis. An active contributor to the open source Drupal community and recipient of the 2024 Women in Drupal award, she helps organizations integrate open-source principles into their workflows, from software development to collaboration and talent development. Passionate about the role of open source in innovation, transparency and fostering diversity and inclusion, she regularly shares her expertise at conferences.

Jessica Tran works as a Security & Compliance officer at team.blue and has been an enthusiastic Linux user for years. Both during work and free time she uses Linux as well as many other open source software and services. In her free time she keeps busy with privacy, security, gaming, and basically everything around computers. Next to that she has a big love for dogs and horses, and she collects CDs.

Since almost 3 years ago she has made a hobby project to get rid of Big Tech and switch to privacy friendly alternatives, with a preference for FOSS and for herself the rule it may take work to set up, but has to be as easy to use as the Big Tech solution afterwards. End 2024 this has been finalised after removing her last Big Tech account, although she still keeps up with current happenings and makes changes based on that.

Jessica can be found on Mastodon at @Cambion@mastodon.nl (https://mastodon.nl/@Cambion) and on her own website cambionn.nl.

DevSecOps Engineer with over 20 years of experience.
Currently working for LimoenGroen.

Focuses on Interoperability, Security, privacy and accessibility.

Find out more about me on Me.Lawri.nl

I got my PhD at the Eindhoven University of Technology in 1997, on the design
of a data compressor in hardware.

Currently I work at Rambus B.V. in Vught as an embedded software engineer. I
work on device drivers for cryptographic modules. Further I write embedded
firmware for thes modules and I work on hardware verification.

Interest: low-level programming, retrocomputing. Linux and the FORTH
programming language.

I started my YouTube channel with videos about the Pinebook Pro.
I publish videos about a lot of devices running Linux, including RISC-V devices.
http://youtube.com/c/LivingLinux

Dr. Lucas Lasota is a researcher, lecturer, qualified lawyer (Brazil) and project manager in the field of IT, telecommunications and contract law. His research focuses on regulatory measures of digital technologies and their impact on individual and collective rights, as well as on internet governance, telecommunications and international contract law. In his work for the Free Software Foundation Europe, he coordinates the Device Neutrality and Router Freedom initiatives. He has been involved in the enforcement of the DMA and has published in the realm of AI and Free Software.

Maikel Mardjan:

More than 29 years of work experience in the IT industry, developing innovative systems and preventing cyber threats. I have worked as an independent architect in large and small companies and institutions, in both the private and governmental sectors.

Always working on architecture & design to solve complex problems in complicated environments. I am TOGAF and CISSP Certified and I hold both a Master (MSc) Business Studies of University of Groningen and a Master degree (MSc) Electrical Engineering, of Delft University of Technology.

Running FreeBSD since version 4 to keep things simple, solid and secure. I still love to do hands-on programming (C/C++, Java, Python, PHP,JS,GOlang etc) to learn, make and break things.

Marcel van der velde is a renowned social engineer, speaker and trainer. From a young age Marcel got interested in human behavior, especially whilst interacting with others or with information systems. “How could it be that the same question asked by one person got a positive result while another was turned down? What made smart people do stupid things? How do magicians do what they do? What about marketing? And fraud?” It started him on a journey through the science of perception, the art of persuasion and the craft of misdirection. After college Marcel combined IT security with these human factors and helped early pentesters succeed in their missions bypassing all kinds of security measures. He soon became “The guy that put the thumb drive on the parking lot”. A now well known story among security professionals – and one of the few that did not remain a well kept secret.

After fifteen years of collaborating with different teams and conducting tests Marcel decided to turn his attention to full-time research and teaching. Still collecting new insights every day he bundelend some of the “war stories” into valuable lessons. With permission, if he would change names, times and places. These became part of his training program, adding real world examples to the theoretical concepts. Incidentally Marcel still helps training pentesters to better understand the human mind. Not just their victim’s but also their own. Resulting in a more confident approach and better results.

Marcel van der Velde is a renowned social engineer, speaker and trainer. From a young age Marcel got interested in human behaviour, especially whilst interacting with others or with information systems. "How could it be that the same question asked by one person got a positive result while another was turned down? What made smart people do stupid things? How do magicians do what they do? What about marketing? And fraud?" It started him on a journey through the science of perception, the art of persuasion and the craft of misdirection. After college, Marcel combined IT security with these human factors and helped early pentesters succeed in their missions bypassing all kinds of security measures. He soon became "The guy that put the thumb drive on the parking lot", a now well known story among security professionals – and one of the few that did not remain a well kept secret.

After fifteen years of collaborating with different teams and conducting tests, Marcel decided to turn his attention to full-time research and teaching. Still collecting new insights every day, he bundeled some of the "war stories" into valuable lessons. With permission, as long as he changed names, times, and places. These became part of his training program, adding real world examples to the theoretical concepts. Incidentally Marcel still helps to train pentesters to better understand the human mind - not just their victim’s, but also their own, resulting in a more confident approach and better results.

I enjoy making software and sharing it!

https://www.ueber.net/who/mjl/

M. August Bournique is a US licensed, Amsterdam based attorney who has worked at the intersection of technology and law since 2016. He has recently focused on the EU Cyber Resiliency Act and is currently part of the standards drafting project for the Act.

Moem does too many things at once. One of them is supporting free open source software by volunteering with UBports, because we all deserve to have a choice in mobile operating systems.

De NLLGG is een vereniging voor iedere Linux- en open source-liefhebber. Wij bestaan uit zeer gevarieerde leden, van doorgewinterde systeembeheerder/programmeur tot eindgebruiker. De activiteiten van onze vereniging zijn gericht op het delen van kennis, informatie en ervaringen. Dit doen we onder andere door middel van mailinglijsten, het organiseren van landelijke bijeenkomsten en samenwerkingen met andere open source groepen.

NLnet ondersteunt mensen en organisaties die bijdragen aan een open internet voor iedereen. We ondersteunen projecten die het internet repareren door open hardware, open software, open standaarden, open wetenschap en open data.

Sander Kooijmans is a skilled software engineer with a passion for open-source projects. He has developed several applications, including Gogo Account, a bookkeeping tool designed for small clubs and personal use. In 2019, Sander presented Gogo Chess, a computer chess game he created as a hobby project, at the T-DOSE conference.

Outside of work, Sander enjoys spending time with his family, playing volleyball, managing bookkeeping for his volleyball club, and composing music. To learn more about Sander and his projects, visit his website: gogognome.nl.

Valerie Aurora is a systems software consultant at Bow Shock Systems, located in Amsterdam. Her specialties are file systems, networking, fixing data corruption, and systems software design and debugging. Her file systems work includes ZFS, ext2/3/4, the VFS layer, and now ngnfs. She first wrote code for the Linux kernel in 1998.

I hold a master’s degree in mathematics and computer science applied to biology from Sorbonne University in Paris. I discovered C++ programming as a child and have been actively involved in open-source communities ever since. My professional experience includes work in 3D graphics, developer tooling, compilers, and runtime design using Rust and Haskell. I’ve taught systems programming, computer architecture, and DevOps to master’s students, and I’ve also designed algorithm competitions and coding workshops for kids and teens, helping them build small video games. I’m currently based in Belgium, working as a NixOS consultant for Numtide. In my free time, I enjoy biking, hiking, climbing, and vegan cooking :)