Matthijs Gielen
Principal Capability Developer at Armadin
Delft, South Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolMatthijs Gielen is a Principal Capability Developer based in Delft with a decade of experience at the intersection of software engineering and offensive security. He has progressed from software development and forensic tooling into senior consulting and security expert roles at Fox-IT, Mandiant, and Google, and now drives capability development at Armadin. Matthijs blends hands-on backend engineering—demonstrated by key contributions improving stability and efficiency to the well-known BloodHound.py ingestion tool—with deep operational security expertise from real-world pen testing and incident response engagements. His academic background in computer security from the University of Twente underpins a pragmatic approach to building maintainable, resilient systems. Colleagues describe him as someone who turns forensic and adversary-focused research into production-ready tooling that materially improves incident workflows.
10 years of coding experience
4 years of employment as a software developer
Master's Degree, Computer Science, Computer Security, Master's Degree, Computer Science, Computer Security at University of Twente
Github Skills (15)
drpc10
rpc10
dce10
python10
error-handling9
threaded8
ip8
network8
net8
tcp8
multithreading8
networking8
thread8
hyper-threading8
security7
Programming languages (2)
Github contributions (5)
dirkjanm/BloodHound.py
Mar 2018 - Apr 2018
A Python based ingestor for BloodHound
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 commits, 1 PR, 4 pushes in 26 days
Contributions summary:Matthijs made several key contributions to the `bloodhound.py` project, which is designed to ingest data for BloodHound. They implemented error handling and improved code reuse in the core `ad.py` file, addressing issues with querying sessions and resolving user names. Further improvements include restructuring the code to improve reuse, along with optimizing the enumeration of computers, making the process more efficient. These changes indicate a focus on stability, efficiency, and maintainability of the backend code.
pythoningestoractivedirectorypython3bloodhound
mwgielen/jackal
Nov 2017 - Dec 2018
Contributions:152 commits, 78 pushes, 1 branch in 1 year 1 month
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