Things I've built

Legacy modernisation of a point-of-sale system for a large retail client. Reverse-engineering an existing AS/400 codebase and migrating it to a service-oriented Java architecture — with both systems running in parallel, requiring continuous synchronisation. Working within a larger team as co-dev-lead for the seller-facing dialogs, while taking hands-on ownership of pricing logic, payment data, and targeted bug fixes in the purchase contract area.

Personal portfolio and blog. Built with Astro for static site generation and Tailwind CSS for styling, deployed on Cloudflare Pages. Designed from scratch with a focus on typography, performance, and a clean dark aesthetic.

Attack-defense CTF platform for the IT security module at Hochschule Niederrhein (Bachelor's thesis). Redesigned and re-implemented an existing system — FastAPI REST backend managing users, game settings, and match monitoring; Vue 3 + TypeScript frontend; Redis and SQL for persistence.

End-to-end IT responsibility for a small retail business. Migrated the online shop from 1&1 eShop to Shopify — including setup, design, data migration, and data cleaning. Self-hosts a mail server, password manager, and internal tooling. Handles mail archiving, backups, and ongoing server management.

AI-supported collaboration board for brainstorming sessions, built with a 7-person team at the itestra Coding Camp 2022. Automatically clusters contributions by semantic similarity using a Gaussian Mixture Model. Backend in Flask + SQLAlchemy with WebSocket-based real-time updates; frontend in Vue.js + Tailwind.