I’m Georg. I’m building Rendity.

I grew up in Niedersachsen (Lower Saxony). At the private bank Bankhaus C. L. Seeliger, I trained as a Bankkaufmann (a bank apprenticeship), together with a dual study program. There I learned how money and trust are connected.

Even while I was still in school, I earned money developing software: websites, a billing system, a booking platform. After the Abitur (German high school diploma) came a bachelor’s degree with a focus on Banking and Financial Services, an MBA, a master’s in Wirtschaftsinformatik (information systems), and a doctorate in Information Technology.

I write Rendity myself, in the evenings and on weekends. I can trace every number you see back to the transaction it comes from.

I built Rendity at the suggestion of my brother Dominikus. Dominikus teaches value investing and has already helped thousands of people on their path to financial freedom. In November 2025, I took part in his training for the first time. The principles he has laid out made intuitive sense to me. So I adopted his method into my own investment strategy.

Dominikus told me there were two problems:

1. In Interactive Brokers, it is hard to see and follow how the investment strategy is performing. For this, he recommends the open-source software Portfolio Performance, but it was not written for options trading. Entering everything by hand is tedious, and things often get forgotten.
2. Interactive Brokers has no German branch and does not produce a tax report for Germany. At least that was the case for many years. The tax advisor needs a lot of time to work through all the transactions and prepare the tax report.

So I took it on as a challenge to solve both problems. Rendity is also my way of working with the new tools of artificial intelligence, and I learn a lot while building it.

A project like this takes more than one person. I am grateful to everyone who tried Rendity over several months and gave me feedback again and again.