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Hej! I’m Karl. I write about and teach advanced web development, UI/UX, and security.
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Kolifink: my sole proprietorship specialized in secure web development
UV-Kollen: Swedish real-time UV-index and forecast service
Rädda Hjärtat concept: Improving UX for CPR and first-aid app
OAuthOrNot: Building a pentest environment for OAuth 2.0 authentication
Using Android’s GPS and sensor permission to calculate the users height
Optimize 4 the win: How JIT compilation affects the execution time of a Java program
Flägermeisters: Lund University’s new CTF team
agentID: The identity layer for AI agents, powered by national eIDs
EU data collection of popular LLM providers in 2026
