Application developer by trade, with a growing focus on secure software, systems administration, and network engineering. I build production-grade applications across the stack and treat security as a design constraint, not a checklist. Outside of professional work, I run a personal homelab that doubles as a learning environment for sysadmin and offensive-security skills.
Most of my public code is in C# / .NET, with active work in Java (Spring Boot), TypeScript/Angular, and Python. Recent open-source focus: OmenMon-Reborn — a hardware monitoring and control utility for HP Omen and Victus laptops.
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Methodologies: Agile/Scrum, TDD, CI/CD, OWASP, DevSecOps |
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A self-hosted environment running on an enterprise-grade rack server with a Raspberry Pi 5 for edge workloads. Used for hosting personal projects (including koteski.ch), continuous learning, and security research.
The lab includes:
- A dedicated Active Directory attack/defense range for hands-on red-team and blue-team work
- A SIEM-based monitoring stack for log aggregation, detection engineering, and incident-response practice
- An intentionally vulnerable application lab for web and network exploitation training
Specifics are kept private by design — running infrastructure publicly reduces attack surface for no real benefit. Happy to discuss approaches and trade-offs privately.
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Maintained fork of the OmenMon hardware control utility for HP Omen and Victus laptops. Migrated the kernel-access layer from WinRing0 to PawnIO (Microsoft-signed) in v1.4.0, added a telemetry-free diagnostic toolkit, expanded the hardware-model database, and automated the release pipeline. Tech: |
Desktop gaming application implementing Blackjack and Slot Machine games with a focus on clean game-state modelling and a polished WPF UI. Tech: |
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High-throughput WPF application estimating π using the Monte Carlo method at up to 10 million sample points, with real-time convergence visualisation. Tech: |
Space-object prediction using classical ML algorithms — applied data analysis and a personal exploration of ML applied to astronomy datasets. Tech: |
More projects
- Raspberry Pi Projects — Pi 5 setup, Apache hosting, Linux administration notes.
- EventFeedbackApp — Web platform for live event feedback collection.
- Several private security-tooling projects (web vulnerability scanner, network traffic analyser, hardening scripts, forensics toolkit) are kept off-public for OSINT reasons.
Active on TryHackMe (top 4%, 135 rooms completed) with completed pathways including CompTIA Pentest+, Jr Penetration Tester, Web Fundamentals, Cyber Security 101, and the Industrial Intrusion pathway. Highlights include the ADversary (top 1%) and Mr. Robot (top 3%) badges, and a Sapphire League first place (top 0.8%).
Currently working towards: CompTIA Security+ · CEH · OSCP. CISSP is a long-term goal.
Open to collaboration on secure software, infrastructure, and open-source security tooling.