Cloud and Full-Stack Case Studies

Platform

flatmo.app – CMS & Accommodation Booking

Ongoing engagement

Current client work on flatmo.app: building a complete content management system and an accommodation booking application in the style of Airbnb and Booking.com.

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Platform

Debevet UG – Backend Development

Past engagement

Client project for Debevet UG, which runs the debevet.de veterinary practice software, the around.pet pet health app and the Wolf & Tiger veterinary practices. My contribution was building the application backend, with responsibility focused on server-side development.

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Platform

around.pet

Past engagement

Pet platform for around.pet GmbH. I built the container-native MVP with a full CI/CD pipeline, then later maintained the existing Flutter app instead of replacing it.

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Platform2022 – Present

Auftrag One – AI Procurement Platform

Live

AI platform for German public procurement (Vergabe). Aggregates tender notices from 200+ German, Austrian and EU sources, classifies each into 331 topics across 25 sectors, and scores them against a company profile.

Read case study Visit WebsitePrivate repository

Key Highlights

Event-driven micro- & macroservice architecture (Kafka Pub/Sub)
530k+ notices analysed
~8.5k new every week
AI topic classification and relevance scoring per company profile
Automated document analysis with deadline
eligibility and award-criteria extraction
Vergabe network graph of buyers and bidders
Multi-organization role-based access and team management
Deployed on GKE with CI/CD
auto-scaling and automated GCP & Backblaze backups

Tech Stack

Golang
Rust
Next.js
TypeScript
Apache Kafka
PostgreSQL
Elasticsearch
Valkey
GCP Storage
Gemini AI
Kubernetes (GKE)
Helm
GitHub Actions

Platform2025 – Present

OnSand – Beach Volleyball Matchmaking

Live

Location-based matchmaking app for beach volleyball. Players find open games and skill-rated partners nearby, organize matches in one place instead of scattered group chats, and climb city and club rankings.

Read case study Visit WebsitePrivate repository

Platform2025 – Present

OnSand Cloud – Club Management

Live

Club management software for beach volleyball associations: members, events and communication in one calm workspace, connected to the public tournament side of OnSand.

Read case study Visit WebsitePrivate repository

Microservices2020-2022

Artconnect Re-Architecture

LiveBuilt pre-AI

Complete system modernization from Ruby monolith to Kotlin microservices. Achieved 99.95% uptime with 60% infrastructure cost savings.

Read case study Visit WebsitePrivate repository

                                                                                
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Infrastructure2016-2018

High-Performance Web Crawler

LiveBuilt pre-AI

Enterprise-grade web crawler processing >150k documents/day with intelligent data extraction and commercialization platform.

Private repository

Architecture2024 – Present

Gesetze.ai – Semantic Law Search

WIP

Experimental side project for semantic search in German legal texts. Still under construction.

Visit WebsitePrivate repository

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Infrastructure2024

d8.gg – URL Shortener

Live

A minimalistic, self-hostable URL shortener written entirely in Go.

Visit Website View Code

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Infrastructure2024

GitHub Actions Auto-Scaler

Live

Personal Dockerized GitHub Actions runner that dynamically registers runners on demand. Bypasses frequent token rotation issues.

View Code

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Infrastructure2023

ImmoScout Realtime Crawler

Completed

Developed for a friend's master's thesis: a Kotlin-based crawler for ImmoScout24 that tracks listings in near real-time.

View Code

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Platform2024

6bit.ai – Website to Markdown Converter

Live

A web service that intelligently converts website content to clean, structured markdown format, preserving formatting and structure while removing clutter.

Visit WebsitePrivate repository

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Infrastructure2024

Northdata Company Data Crawler

Completed

Automated web crawler built with TypeScript and Playwright to extract company information from Northdata. Handles dynamic content loading and produces structured data.

Private repository

Open for new projects

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