What I use, and where I have actually used it.
No percentages, no five-star ratings, those would just be made up. Instead, every entry says where I have actually used it.
CVmarks a skill listed on my 2026 CV. The rest are evidenced by public projects.
Languages
The core set, from the CV and used across internships and products.
Python
CVData lab work, tooling, automation scripts
TypeScript
ReplicaMD, ReplicaHive, this site
JavaScript
CVBoth internships, client front ends
PHP
CVBackend features at Korenhof en Partners
HTML5
CVCSS3
CVMySQL
CVRelational data modelling
Frameworks & UI
What the interfaces are actually built with.
React
CVProduct front ends
Next.js
BTM CarCrew, FlowMode, this site
Tailwind CSS
WordPress
CVClient sites at both placements
Divi
Buro CITE
CodeMirror 6
ReplicaMD editor
Electron
ReplicaMD, ReplicaHive
Data, AI & reporting
My degree track, the layer underneath the agent tooling, and the reporting side that sits next to it.
NumPy
Pandas
scikit-learn
PyTorch
Matplotlib
Jupyter
Data Lab sprints
Power BI
Dashboards and reporting
LLM orchestration
ReplicaHive multi-runtime agents
Infrastructure & Tooling
Getting things built, containerised, automated and deployed.
n8n
Workflow automation
Make
Visual automation
Docker
CVContainerised dev environments, self-hosting
Git
CVGitHub
CVGitHub Actions
CI and release automation
Ubuntu / Linux
Self-hosted deployments
Vite
Playwright
End-to-end tests in ReplicaMD
Vitest
879 unit tests in ReplicaMD
The non-technical half.
Competencies as assessed through my education and placements, listed in both English and the original Dutch.
Where the work happens.
Editors and IDEs listed on my CV.
- Visual Studio Code
- PHPStorm
- Visual Studio
- Brackets
Got something you want built?
I'm up for freelance work, internships and just building things together, whether that's a WordPress site, a dashboard or a full app. Email is the quickest way to reach me.