Full-Stack Software Engineer · Java · Spring Boot · Angular
I design and ship production-grade web applications end to end — from the data model and execution engine on the backend to the reactive UI and the cloud deployment I own myself. I care about clean architecture, multi-tenant isolation, observability, and infrastructure-as-code.
🚀 Building Postwerk — an AI-driven email automation platform · 🌍 Germany
AI-Powered Email Automation Platform. Build visual, drag-and-drop workflows that classify, extract, reply, forward, and act on your emails — powered by Google Gemini. Live in open beta at postwerk.io.
Building & running an email automation with the AI assistant — no code.
Engineering highlights
- ⚙️ DAG automation engine — automations are graphs of 15 typed node types run by a single executor (not a giant switch), with supervised execution (
AUTO/REVIEW/OFF), dry-run per-node tracing, and recursive reusable sub-flows. - 🤖 Conversational AI builder — a typed tool registry exposed to Gemini behind an
OPEN → PLANNING → BUILDINGphase machine, so the assistant safely modifies a live automation from natural language. - 🔍 Hybrid semantic search — pgvector cosine similarity fused with Postgres full-text via reciprocal rank fusion, gated by an LLM match-judge.
- 🏢 Multi-tenant SaaS — organizations as tenants, org-scoped at the query level, RBAC + JWT, plan-based AI quotas, GDPR data retention & audit logging.
- 🔐 Keyless CI/CD — GitHub Actions builds each image once and ships to GCP on merge with zero long-lived credentials (Workload Identity Federation / OIDC, IAP-tunnelled SSH, health-gated auto-rollback).
🌐 Live Demo · 📂 Source & Full Docs
| Category | Technologies |
|---|---|
| Backend |   |
| Frontend |    |
| Data & Cache |    |
| AI |   |
| Cloud & DevOps |      |
| Observability |    |
| Testing |     |
| Project | Description | Stack | Links |
|---|---|---|---|
| Brief-Fix | DIN 5008-compliant German letter generator with AI-assisted composition and window-envelope-ready PDF rendering. | Spring Boot · Angular · Gemini · Cloud Run | Live · Frontend · Backend |
| 2Do | Cloud-native task management with Redis-backed JWT blacklisting, rate limiting, and Azure deployment. | Spring Boot · Angular · Redis · Azure | Live · Frontend · Backend |
| Legacy MauMau | My first app (2021) — a 100% human-made card game, zero AI, lots of late-night debugging at Uni Hannover. | Java | Code |
I use Claude Code and Gemini as part of my daily workflow — not as autopilots, but as tools I direct with intent.
- I own the architecture. Every structural and design decision is mine.
- I review all AI-generated code before it goes anywhere near a codebase.
- No vibe coding. I understand what I ship.
AI accelerates the work. It doesn't replace the thinking.
