From hackathon builds to seminar work.

• A CNN written from scratch in NumPy, including backpropagation.
• Seven CNN architectures compared in PyTorch on four public datasets of up to 30k images, then lung segmentation and class activation maps in a Qt/C++ DICOM viewer.
• Jugend forscht 2024: Thuringian state winner and a special prize at the national final. All 60 commits are mine.

Started as a high-school research project and continued at Jugend forscht. Results are from the project's own validation split, not a clinical validation.

Sole author of the code; team of three at Jugend forscht

Also used: Qt, C++

• Stakeholder interviews and a BPMN model of the as-is process; 15 pain points prioritized; the concept makes the event the single source of truth, with a view for each role.
• The team shipped a Next.js app on Vercel with a Google Sheet as data store, so it costs nothing to run: organiser board, sign-up without login with a waitlist, and an event log that checks real events against the designed process.
• My part: one of the stakeholder interviews, the closing part of the interim presentation and the opening slides of the final one. Module grade 1.3.

Course project in Foundations of Enterprise Applications at HPI with ESN Potsdam, a volunteer organization that runs about 80 events per semester across six tools. We interviewed people in different roles, modeled the process in BPMN and shipped a prototype as a team. The code lives in a teammate's private repository; the preview is an illustration with sample data.

Interviews, process analysis and presentations in a team of five

• 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: USB Host API

• 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

• The pipeline goes from detection to tracking to re-identifying individual animals and counting the population. Previous cohorts built it; our cohort continues it.
• To get started I worked through the previous cohorts' theses and the group's WACV 2026 paper and, with AI assistance, turned them into a sourced study guide.
• The preview explains the pipeline's steps with placeholder images, not real camera-trap footage.

HPI bachelor's project at Prof. Gerard de Melo's AI chair. It continues a multi-year pipeline that detects, tracks and re-identifies wild gorillas in camera-trap video. The project started in October 2026 and runs until summer 2027; there are no results of mine yet.

One of eight students (ongoing)

• Problem: in highly automated production, machines report errors all the time, and the early signs of an unplanned stop are easy to miss.
• Approach: deterministic code computes every number; an LLM agent only investigates through tools, explains what it finds and routes it to the right people; a human approves anything written back to the ERP system.
• I took part in the on-site user interviews with the partner and built the reporting and early-warning pipeline.

Seminar Trends and Concepts – Building Agentic Products at HPI, with BMW as industry partner. The details are confidential, so this entry only covers the problem, the approach and the technologies. The final presentation is in January 2027.

Team of six (ongoing)

Also used: LLM agent with tools

• 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

• 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.

32 of 33 commits

• 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

• 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: Python

• Named, nested slide sections: model, headers in the thumbnail sidebar, collapse state that persists, indent and outdent with Tab, n and p to jump while presenting, save and load.
• An LED presentation timer built as a small subclass of the existing timer morph. I also traced a keyboard-focus bug into the UI framework's event routing and fixed it with a regression test.
• Set up CI with GitHub Actions and smalltalkCI, made the tool run on Squeak 6.1 and rewrote the README. Module grade 1.0.

Software Engineering I at HPI: our team of seven took over the open-source presentation tool PowerSqueak and extended it over nine sprints with weekly customer meetings and pair programming. Team test coverage went from 84% to 95%.

Feature owner for sections and timer in a team of seven

• 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

• 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.

43 of 120 commits

• Players spend elixir to play heroes and spells from a hand of cards; units find their path and fight. Bot opponent with four difficulty levels, wave mode, tutorial and local multiplayer.
• My part was the hand, card and elixir subsystem: deck cycle, selection and play logic, elixir regeneration and spending, and the UI morphs, refactored over several iterations.
• The team code uses Abstract Factory, Strategy, Template Method, Null Object and Flyweight. Module grade 1.0.

Built in the Software Architecture course at HPI as a team of seven: a card-based tower-rush game in Squeak/Smalltalk, with design patterns applied throughout. The repository belongs to the course and is private, so the preview is a rebuilt illustration.

Card, hand and elixir subsystem in a team of seven