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Hello, I am
Daniel Kosbab

Mathematics and Full-Stack Engineering

Portrait of Daniel Kosbab
About me

How I think about software

I'm 29, a full-stack engineer with a mathematics degree, working between Germany and the Netherlands. Math taught me to see patterns, think in systems, and break complex problems into clean, logical steps — that's still how I approach every line of code.

I also specialize in web accessibility (EN 301 549). My brain latches onto edge cases — I see the ways things break before I see the happy path. If a site doesn't work with a screen reader, it's broken. Period. I dive deep into these problems until they're actually solved, not just "fixed." Half-complete solutions bother me in a way that's hard to explain.

Outside of work: running, coding, piano, science fiction, astronomy.

My Expertise

Three things I'm good at

Mathematics

Strong foundation in mathematical modeling, optimization algorithms, and statistical analysis. Applying theoretical concepts to solve real-world challenges.

Full-Stack Engineering

End-to-end application engineering from database design to responsive frontends. Modern tech stack with React, Next.js, TypeScript, Node.js, and PostgreSQL.

Web Accessibility

Expert in EN 301 549 standard. Building inclusive digital experiences that work for everyone, including assistive technology users.

Technologies

What I build with

Python
R
PyTorch
TensorFlow
scikit-learn
Keras
OpenCV
Pandas
NumPy
Plotly
Jupyter
React
Next.js
Gatsby
TypeScript
JavaScript
Tailwind CSS
Node.js
FastAPI
GraphQL
Docker
Kubernetes
PostgreSQL
MySQL
MongoDB
Supabase
Firebase
Git
GitHub
Storybook
Projects & Activities

What I'm working on

2024 – Present

DeepSpectrum Lab

A community of neurodivergent developers (autism, ADHD) building software that helps neurodivergent children train socio-emotional skills.

Machine LearningReactNext.jsPythonAccessibility
2025 – Present

Mathematics Tutor (Pro Bono)

Voluntary mathematics tutoring at Universiteit van Amsterdam. Helping students build intuition for abstract concepts and bridge the gap between theory and application.

MathematicsTeachingUniversityPro Bono
2025 – Present

Accessibility Inspector (Stealth Mode)

Automated a11y testing across modern frontend frameworks — React, Next.js, Gatsby, Vue, and Svelte. Auditing component libraries for EN 301 549 compliance, catching accessibility issues before they ship.

AccessibilityReactNext.jsVueSvelteTesting
2019 – 2024

FrOSCon Volunteer & Speaker

Volunteer and speaker at the Free and Open Source Software Conference (FrOSCon) at Hochschule Bonn-Rhein-Sieg — one of Germany's largest open-source community events.

Open SourceCommunityConferenceSpeaking
2019 – 2021

Programming Tutor

Tutoring computer science students at Hochschule Bonn-Rhein-Sieg. Covering programming fundamentals, data structures, and algorithms.

TeachingComputer ScienceUniversityJava
Contact

Let's work together

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© 2026 Daniel Kosbab

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