Károly Nyisztor
Károly NyisztorSoftware Engineer, Entrepreneur
My passion is helping people through online courses. So far, I’ve inspired over 100,000 students worldwide.

Hi there, my name is Károly Nyisztor. I’m a software engineer, online instructor, and book author. You can find my courses and books on all major platforms including Udemy, LinkedIn Learning, Lynda and Pluralsight.

I’ve worked with companies such as Apple, Siemens, SAP, Zen Studios, and many more. I’ve designed and built several enterprise frameworks, and I hold twelve patents related to inventions in the field of mobile computing.

I’ve developed over a dozen iOS apps and games – Libra Balance, My Travel Assistant, Travel Mate, iSyslog, GiftShopper, Zombie Run, to name a few. Most of these apps have been featured by Apple (New and Noteworthy, App of the Month, Best Travel Apps).

I’ve been working with various technologies and programming languages, including real-time x86 Assembly and C, C++, Java, Objective-C, Swift, and Python.

After 18 years, I left the corporate world to start my own business. Since 2016 I’m fully committed to teaching.

As an instructor, I aim to share my 20+ years of software development expertise. I currently am teaching iOS Programming, Object-Oriented Programming, Security, Swift Programming, Machine Learning, Object-Oriented Design, and UML.

BIOSetup – an app I developed back in 1998. I implemented it using 100% pure x86 Assembly  

  • Featured a graphical user interface with drop-down menus and mouse support
  • Allowed displaying and updating the BIOS and CMOS settings of most x86 computers
  • Admins could save the setting and apply it to multiple computers
  • It was quite unique back then ;)

GiftShopper > “App of the Week”
My Travel Assistant > “Best Travel Apps”

I always make a draft plan. Then, I break down the bigger tasks into smaller ones, until I get manageable pieces.

I love hiking and lifting weights. 

Who Am I?

It Started With A ZX-Spectrum

A couple of
Several decades ago, I got my first computer, a ZX-Spektrum. This is how it’s started, and programming computers became an integral part of my life.

Karoly Nyisztor
Founder at LEAKKA

As I got my hands on my very first computer, I knew that programming would play an essential role in my life.
Fresh out of university I started working at a big software company. Although I worked on great projects, I’ve never felt accomplished by just doing the usual 9-to-5 work.
My side-projects were the ones that made me feel alive; these hobby projects probably saved me from the burn-out most fellow software developers encounter during their career.
I wrote three books: the first one on the practical aspects of programming in C++.
The second and the third book was about DirectX programming and shaders.

I started developing a 3D space adventure game called “The Gamma Project.” After a few months, the game looked promising, good enough to send out the demo to a couple of publishers.
It was 2005, and there was no AppStore back then. There were only a handful of small publishers who would consider publishing an indie game. Eventually, I realized that I wouldn’t get anywhere with my game. Those were tough times for indie developers.

In 2007 Steve Jobs announced the first iPhone, which had brought significant changes.
The iPhone App Store opened on July 10, 2008, and changed the lives of many aspiring app developers, including mine.
I published my very first iOS game in September 2009. Since then, I’ve developed many apps and games, some of which (my Travel Assistant, GiftShopper, iSyslog) were featured by Apple and mentioned by prominent media outlets.

I started creating online courses in March 2016. I’ve published courses on Udemy, Pluralsight and LinkedIn Learning. Teaching has always been my passion, and I’m happy to reach such a broad audience.

In December 2016 I had quit the corporate world. I can now fully dedicate myself to creating courses and working on projects I’m passionate about.

If you have any questions, please email me directly and let me know how I can help. I’d be interested in getting your feedback. The feedback that you give me, is strictly confidential. Email me at karl@leakka.com

Mens sana in corpore sano