Kai Greshake, Security Testing Developer in Saabrücken, Germany
Kai Greshake

Security Testing Developer in Saabrücken, Germany

Member since May 26, 2017
Kai works in the field of IT security research. He's a seasoned developer and security consultant. Having worked on projects of all sizes with remote and local teams, he can deliver standalone high-performance applications for use in a back-end environment, penetration testing, and general security consultation. His high-quality education in computer science allows him to understand and apply complex subjects efficiently.
Kai is now available for hire




Saabrücken, Germany



Preferred Environment

Git, Linux, .NET Core/Rust

The most amazing...

...thing I've created is a neural network trained on quotes from famous people—generating new "wisdom" which self-improves through user feedback.


  • Security Researcher

    2015 - PRESENT
    Center for IT-Security, Privacy, and Accountability
    • Developed high-performance software for the parallel calculation of advanced anonymity metrics.
    • Analyzed the security of Android apps that were generated using app generators (e.g. Appy Pie, SeattleCloud, and others).
    • Developed a fuzzing environment and tools to fuzz the Android middleware.
    Technologies: .NET Core, C, C++, Rust, Python
  • Software Developer

    2014 - 2015
    KS Software (now xbAV)
    • Developed a financial consultation back-end (calculation of taxes, interest rates, and more).
    • Worked on a UI using WPF for the consultation process.
    • Implemented quality-control measures (unit tests).
    Technologies: .NET Framework, WPF, Git, Visual Studio
  • Freelance Developer

    2012 - 2014
    RS Wägetechnik
    • Developed a back-end calculating the advanced metrics over the calibration data collected from various high-precision measurement devices.
    • Built a login system and infrastructure with access control and user management.
    • Designed and implemented a front-end desktop application interface to input and manage calibration data.
    Technologies: .NET Framework, WPF, Visual Studio, Git


  • i3status-Rust (Development)

    This is a very resource-friendly and feature-rich replacement for i3status; written in pure Rust. An open-source project that I've started and continue to maintain.

  • QuoteBot (German) (Development)

    A neural network bot trained on quotes from famous people, generating new "wisdom" which self-improves through user feedback. It posts content on its own Facebook page. Currently it's only in German and is not active right now. The feedback home page also is currently not online due to the cost of operation.

  • Dieter Meurer Award (Other amazing things)

    This is an award for achievement in the field of legal computer science, pertaining in this case to my responsible disclosure of open-access database breaches (early '15). The link refers to the paper that we published in response to the incident.

  • Specialized Lectures (Other amazing things)

    These are some of the specialized courses that I attended in university:
    - Web Security
    - Cryptography
    - Secure Software Engineering
    - Security Testing
    - Cybersecurity
    - Cybersecurity Project
    - Security (Advanced Lecture)
    - Hacking
    - Mobile Security

    I'm happy to answer any further questions about the topics covered.

  • Dell Software Security Acknowledgment Program (Other amazing things)

    This program was made for the vulnerabilities in the Dell update system which I discovered and helped to fix.


  • Languages

    C#, Python, Go, SQL, Rust, C
  • Platforms

    Linux, Android
  • Other

    Cryptography, Security Testing, Cyber Security
  • Tools

    Microsoft Visual Studio, PyCharm, IntelliJ IDEA, CLion
  • Paradigms

    Concurrent Programming, Agile
  • Frameworks

    Django, Flask, ASP.NET, .NET Core
  • Industry Expertise

  • Storage

    MongoDB, PostgreSQL


  • Bachelor's degree (in progress) in Cybersecurity
    2014 - 2018
    Saarland University - Saarbrücken, Germany

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