Coffer is a side project I started to keep track of my own coin collection. It manages collections with detailed metadata, pulls real-time precious metal prices to value the portfolio, and integrates with the Numista catalog for coin details. The backend is built with Kotlin and Spring Boot on top of PostgreSQL, with an Angular frontend. Source on GitHub at github.com/verbindolai/coffer.

Quizolai is a webapp and public REST API for German quiz questions, currently being rewritten from NestJS to Spring Boot + Kotlin with Auth0 login and a Stripe-backed Pro tier. The previous version reached around 50 registered users and ranked

I've been looking to get into mobile development and thought trying out Flutter would be an excellent start. Considering my interest in fintech, a budgeting app seemed like a great choice. I decided to focus on a project that centers around basic functionality and the option to create sub-accounts.

Starting with a Raspberry Pi and an old laptop, I gradually delved deeper into self-hosting and homelabbing. It has become an invaluable resource for experimenting with new technologies and hosting applications within my local network.

Using 3D-Printing, an ESP-32 microcontroller and some coding, i enabled my roomates to control the central thermostat through a webpage on the local network.

I was looking for a drawing game similar to skribbl.io but capable of accommodating a much larger group of players for our friend group. To achieve this, we developed our own game using TypeScript/JavaScript, incorporating libraries such as Express and Socket.io. Prioritizing a fast result and not utilizing a frontend framework while still developing a single-page application (SPA) led to some code complexity, but in the end, we succeeded in making a game that was not only playable but immensely enjoyable.

One of the earlier web dev projects i did. With two friends we created this project just for the joy of coding together. We opted for Go and plain JavaScript, no fancy frameworks involved. The code ended up being a bit of a tangled mess, but the whole process was an absolute blast and a fantastic learning experience.