talfahrt.
Software engineering from the Wuppertal area, Germany
Web apps for the phone, backends in Java and Spring Boot, integrations that just run – software that feels light.
Projects
My own web apps, live on talfahrt.dev – from idea to prototype in hours, in production within days.
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gruppetto Everything for Grand Tour fans
The all-in-one app for Grand Tour fans: stage predictions with bonus rankings and joker limits, a live leaderboard for your own group, results and classifications pulled in automatically after every stage, news, stage pages with elevation profiles, climbs and start lists – and 3D mini games where the group races each other. Mobile first, installable from the home screen.
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Rosenherz Castle-building game for iPhone
Clara and Mia inherit Rosenherz Castle and turn it back into a home, room by room. Every room is a 3D dollhouse, every graphic drawn in code, playable offline.
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Neon TD Neon-style tower defense
8 worlds, 48 hand-built tracks, a weekly arena with a global leaderboard. The game logic is written in Java and runs on iPhone, in the browser and as a desktop app.
Architectures
Patterns that have proven themselves in production – as living sketches, computed live in your browser.
A cluster that breathes with the load
When requests rise, new instances spin up. When it calms down, they scale back – carefully, so nothing flaps. Response times stay steady, the bill stays small.
Kubernetes, Horizontal Pod Autoscaler, Prometheus, Grafana
A cache layer between database and frontend
What is already known, the middleware answers within milliseconds; only the rest goes to the database. When a record changes, exactly that entry is dropped – not the whole cache.
Spring Boot, Spring Cache, Redis, Oracle, PostgreSQL
Deployment without downtime
The new version starts next to the old one, passes its health checks and only then takes over traffic. Instance by instance, with a way back – users notice nothing.
Kubernetes, rolling updates, readiness probes, CI/CD
Events instead of file exchange
ERP, shop and partners write events into a stream, every system reads at its own pace. If a consumer drops out, the messages wait for it – and are never lost.
Kafka, ERP integration, partner interfaces, e-invoicing
Monitoring that speaks up first
Metrics, logs and alerts in one place. When response times creep up, the system speaks up before anyone notices – and also tells you when everything is fine again.
Grafana, Prometheus, Loki, Alertmanager, SLOs
Software solutions
Software development for companies and teams: from idea to prototype in hours, to a finished solution in production within days. Remote, per project or ongoing.
Web apps that feel like apps
Fast, offline-capable, launched from the home screen – no app store, no bloat. Made for the phone, good on the desktop.
Backend and interfaces
Java and Spring Boot, REST with OpenAPI, PostgreSQL or Oracle. Production-critical, documented and tested.
Cloud and operations
Kubernetes, Azure or AWS, CI/CD, monitoring with Grafana, Prometheus and Loki. Deployments nobody notices.
Performance
Caching, database tuning, load behaviour under real numbers. Response times that are measured rather than guessed.
Integration
ERP connections, partner interfaces, event streams with Kafka, e-invoicing and reporting obligations. Imports that run at night and report in the morning.
Modernisation
From Java 8 to current releases, from COBOL, Delphi or SVN to Java, .NET and Git, from one cloud to another – step by step, without stopping the business.
About talfahrt
talfahrt is a software studio near Wuppertal, Germany: one software developer, everything from one pair of hands. It builds back-office systems in Java and Spring Boot, integrations with ERP and invoicing systems, and its own web apps with React, Supabase and WebGL.
- Location
- Wuppertal area, Germany – remote
- Focus
- Java, Spring Boot, REST/OpenAPI, PostgreSQL, Oracle, .NET, TypeScript, React, Supabase, WebGL
- Cloud and operations
- Kubernetes, Docker, Azure, AWS, CI/CD, Grafana, Prometheus, Loki, Kafka, Redis
- Also
- COBOL, Delphi, Git migrations, e-invoicing (e.g. KSeF), ERP integration (Dynamics 365), AI integration (LLM connectivity)
- Languages
- German, English