Nine projects, all with code.

• Tabs for matches, videos, table and statistics, plus an AI chat against an AWS API Gateway backend.
• Quiz mode with text-to-speech; my part included the project setup, the chat UI and native sharing with fallbacks.
• One of six winning teams at the Bundesliga Hackathon 2025.

Cross-platform app (Expo, React Native; web, iOS, Android) built for the first Bundesliga Hackathon 2025 by DFL, AWS and EintrachtTech. The screens come from the final prototype, run locally. The AWS backend is switched off, so the chat answer shown is a sample.

Repository owner in a team of three

Also used: AWS API Gateway

• Ranks 569 real conference profiles with an explainable, deterministic match score.
• Split the work into 30+ ownership packages; parallel AI coding agents ran in 50+ git worktrees.
• Rule-based fallbacks keep the demo running without an API key. No prize; the MVP runs on Cloudflare Workers.

Built at the OpenAI Hackathon at IdeaLab! 2026 (WHU Vallendar). An agent interviews a founder by text or voice, derives a search profile, ranks real conference profiles, drafts personality-adapted outreach and offers a voice role-play to prepare the conversation.

Technical lead in a team of three to four

Also used: OpenAI Agents SDK, OpenAI Realtime API

• Adapter-based data gateway (JSON today, a database later) and contract-driven data types that generate the editing forms.
• Dependency-free Canvas scene engine: three themes in day and night versions, three effect levels, reduced motion respected.
• Automated UI and performance audits across eight viewport widths.

Bilingual site for takeøff, a student cultural collective in Potsdam. Live on Vercel; some content is still placeholder.

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Also used: Vanilla CSS, Canvas 2D

• Spaced repetition, multiple choice, accent-tolerant typing, text-to-speech and verb tables for seven tenses.
• Optional AI tutor that runs with your own key, entirely in the browser; Anki export.
• Content lives in 74 JSON files registered through manifests: a new chapter is a new file.

A vanilla-JavaScript PWA for learning Spanish up to B1/B2, offline and without an account. Live on GitHub Pages.

Solo

Also used: Service Worker, localStorage, GitHub Pages

• Incremental backups with hash-based deduplication and chunked copying; restore included.
• Foreground service with notifications, reminder worker, Quick Settings tile, three home-screen widgets and a share target.
• Repository is being prepared for release on GitHub, so there is no link yet.

An Android app for incremental photo and video backups to USB storage and back. About 26k lines of Kotlin in 155 files. The repository is being prepared for release on GitHub.

Solo

Also used: Hilt, Room, WorkManager, USB Host API

• Pages for accommodation, flights, car, activities, packing list, budget, votes, idea wall, day plan and tasks.
• Cloudflare Worker for GitHub OAuth, data sync through the GitHub API and a scraper that reads offer links.
• The group of five planned their trip with it.

A static multi-page site on GitHub Pages with a Cloudflare Worker behind it.

Solo

Also used: GitHub Pages, GitHub API

• Embedding-based topic matching on Supabase with pgvector, a multi-agent simulation of your future stakeholders and a voice interface.
• My part: chat, networking and browse features with 20+ React components, two Supabase Edge Functions, migrations and session persistence.
• START Hack 2026, St. Gallen: participation, no prize.

Built at START Hack 2026 in St. Gallen for the Studyond challenge. Participation, no prize.

Chat, networking and browse features

Also used: pgvector, Edge Functions

• Groups, debt tracking, reminders and analytics.
• I owned authentication: email verification and social login on Firebase.
• Stopped when payment regulation made the transfer feature impractical for two students.

A Flutter prototype built with a fellow student. There is no public build, so the preview is an illustration of its home screen, rebuilt from the source code.

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