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Hej! I’m Karl. I write about and teach advanced web development, UI/UX, and security. More →

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  • Kolifink – my sole proprietorship specialized in secure web development

    Kolifink – my sole proprietorship specialized in secure web development

  • UV-Kollen: Swedish real-time UV-index and forecast service

    UV-Kollen: Swedish real-time UV-index and forecast service

  • OAuthOrNot: Building a pentest environment for OAuth 2.0 authentication

    OAuthOrNot: Building a pentest environment for OAuth 2.0 authentication

  • Using Android’s GPS and sensor permission to calculate the users height

    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

    Optimize 4 the win: How JIT compilation affects the execution time of a Java program

  • Flägermeisters: Lund University’s new CTF team

    Flägermeisters: Lund University’s new CTF team

  • Creating the best social share package React has ever seen

    Creating the best social share package React has ever seen

  • Using Gmail & Google Sheets API to create a conference room booking bot

    Using Gmail & Google Sheets API to create a conference room booking bot

Karl Sellergren

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