Sebastian GlaserFull-Stack Developer · Security-First Architecture
glaser@hktr.de+49 163 217 97 06
Sebastian Glaser

Sebastian Glaser

Full-Stack Developer · Security-First Architecture

Building Scalable Systems with Security at the Core

29 yrsExperience
Security Pentesting & Audits
Development Lead Cross-functional Teams

About

Self-taught Full-stack developer with 29 years of experience building scalable, secure systems. Shipped code in a lot of languages and frameworks.

Deep expertise in security architecture, penetration testing, and reverse engineering combined with modern full-stack development.

Strong background spanning embedded systems to cloud-native architectures. Extensive hands-on experience with security audits, cryptography, and implementing security-first patterns in production systems.

Proven track record in technical leadership roles, managing development teams and establishing engineering standards. Focus on delivering robust, security-conscious solutions for complex enterprise requirements.

I am trained in typography and design, and happen to know the difference between hyphen (-), en-dash (–) and em-dash (—) … not AI slop — relevant craftsmanship 🤣 Exciting times!

Skills & Expertise

Core Expertise

Security ArchitecturePenetration TestingReverse EngineeringTeam LeadershipTechnical ArchitectureCode ReviewDevSecOps

Languages

JavaScript/TypeScriptC/C++🙌 zigRustPythonPHPRubyJavaC#GoBash

Frameworks & Platforms

Node.js/BunReact/PreactVueHono/ExpressRailsDjangoTailwindCSS

Infrastructure

LinuxCloud (AWS/GCP)Docker/K8sPostgreSQLMongoDBRedisCI/CD

Security & Tools

IDA ProHopperBurp SuiteWiresharkVPN/Network SecurityCryptographyAircrack-ngNmap

Scriptkiddie Suites

Kali LinuxParrot OSBlackArchMetasploit

Relevant Experience

Developer
Mar 2026 – May 2026
Remote
  • Backend architecture and development for startup platform
  • System design and implementation
Lead Developer / Development Manager / Deputy Head of Tech
Jun 2021 – Mar 2026
Düsseldorf
  • Owned technical responsibility for website and online shop serving national lottery platform
  • Drove international architecture and software projects across multiple markets
  • As Deputy Head of Tech, responsible for day-to-day operations of entire tech department
  • Managed cross-functional development teams and established engineering standards
  • Designed and implemented security-first architecture patterns
Teacher Web Development
2019 – 2021
Düsseldorf
  • Taught full-stack web development with focus on MERN stack
  • Mentored junior developers transitioning into tech careers
  • Developed curriculum for modern JavaScript and React development
Chief Technology Officer
kstx (Startup, defunct)
2018 – 2019
Monheim am Rhein
  • Built ticketing platform with offline-capable QR code system
  • Implemented EC cryptography for secure offline validation
  • Led technical architecture and team hiring
Security Consultant & Developer
hakt0r consulting (Self-employed)
2014 – 2019
Düsseldorf
  • Security audits and penetration testing for enterprise clients
  • Physical penetration testing and vulnerability assessments
  • Custom software development and system integration
  • Reverse engineering and protocol analysis
  • Created multiple open-source tools and frameworks
Software Developer & Hosting Services
hakt0r root services (Self-employed)
2007 – 2014
Bonn
  • Full-stack web development and hosting solutions
  • Security analysis and hardening for production systems
  • Mobile app development (iOS, Android, web)
  • Database design and optimization
Web Designer & Developer
syanterra neue medien GbR
1999 – 2003
Bonn / Königswinter
  • Web design and development
  • Graphics design & DTP
  • Desktop applications (RAD, RealBasic)
  • Database Applications (SQL, FileMaker Pro)

Recent Private Projects

⌨️ Mechanical Keyboard Conversion
Completed

Converted mechanical keyboard from USB to wireless.

  • 📡 Bluetooth connectivity (standard stuff)
  • 🌐 WiFi connectivity with SSH to remote host
  • 🔧 udev keystroke injection (because Wayland is 🤷‍♂️)
  • 🖨️ 3D printed custom case
  • 🔋 20k mAh powerbank (heavy as a brick 😄)
🧠 Brain Simulator
Zig, Vulkan
Completed

Totally pointless fully featured brain simulator in Zig + Vulkan to teach me both. Yes, I used AI for the crazier parts because 😄

  • 🔗 Bidirectional connections, autapses with delay buffers
  • ⚡ Hebbian plasticity
  • 😴 Sleep/consolidation phases
  • ⚡ Sparse spiking compute
  • 🌡️ Neuromodulatory temperature field
  • 🌱 Growing connectivity
  • ⚖️ Energy-based homeostasis
  • 🔬 Glial cells as second population
  • 🧪 Physical chemical diffusion shader
  • 📡 Splash/wireless distance-based connections (for messenger simulation)
  • 🌿 Neuron forking/splitting
  • 📍 Permanent spatial embedding (🎩 @ Penrose)
  • 🎲 4-bit quantized weights with stochastic rounding
  • 🔮 Quantum-inspired entanglement via shared seeds (🎩 @ Penrose)
  • 💥 Result: 16k neurons on my big ass GPU… who would have thought that kind of complexity is a bit overdressed 😄
🌌 MMO 4X Game (k3 aka kardashev 3)
Bun, Three.js, TSL
In Progress

Currently writing an MMO 4X game in Bun + Three.js/TSL. It's mostly a big effin' shader.

🖥️ X11 Server (Xfr/Xvulgar haven't chosen yet)
Zig, Vulkan, DRM
In Progress

Ground-up reimplementation of X11 protocol in Zig, designed for multiseat, network transparency, live migration, and per-seat independent cursors. The final middle finger to Wayland cultists and Xorg maintainers. Because I'm a little troll.

🔺 Delta Framework
Bun, JavaScript
Ongoing

Comprehensive full-stack framework for building modern, scalable applications with Bun. Security-first architecture with modular design, real-time capabilities, and optimized for Bun runtime.

  • 🔧 Core utilities and services (process management, certificates, caching)
  • 🌐 API framework with WebSocket support
  • 🔒 Authentication and authorization system
  • 💾 Distributed key-value store
  • 🔐 Secure secrets management
  • 🌍 DNS management and resolution
  • ⚛️ React integration with state management
  • 🛠️ CLI tools and development utilities
  • 🔄 This CV is hosted by Delta (Meta 🤯)

Fun Time

Archived homepage from 1997

Earliest capture of my web presence — the last version of my first homepage (netsurf is defunct, archive.org link). I distinctly remember writing code to update my age dynamically after having to do it manually. Sadly, I can't find an indexed version of syanterra.de that was founded in the summer of '97.

It's cute how small the web was back then 🌐 I connected to a guy from ETH-Zürich, because the volcano community was so small back then 🌋

If you were around in the mid 90s and used FirstClass to access graphical mailboxes… the probability is high that we ran into each other 👋

Glider Pro game screenshotMarathon game screenshotEscape Velocity game screenshot

My favourite game was Glider Pro 🛩️ for a long time, along with the Marathon series by Bungie Software 🎮 and the Escape Velocity series by Ambrosia Software Inc. 🚀

A/UX screenshotmkLinux screenshot

When A/UX sucked hard I switched to mkLinux 😄 dual boot of course 😄

A time when every single move you made in terms of hardware required coding or adapting yourself 🔧 Suffice to say: not everything was better back then 😅