Alt F4
Software that outlasts the hype.
Open source since 2012 — 7,500+ stars on the Go Elasticsearch client. Procurement platforms in production at DAX-listed companies. One person you actually talk to.
Selected work
- Quellwerk — drinking water risk managementRisk management copilot for small water utilities: lab report import, limit early warning, and hazard analysis per DVGW W 1001.
- IntakeAgentic procurement: rethinking procurement for the AI era.
- Johnson Controls Procurement PlatformAI-supported procurement platform with catalog and punchout shopping, rolled out across Europe on AWS.
- Elastic - Elasticsearch Client for GoThe go-to unofficial Elasticsearch client for Go with 7,500+ GitHub stars, used in production since 2012.
What we stand for
Long-term thinking
We build software meant to run for years, not sprints.
Deep expertise
Decades of experience across procurement, logistics, and enterprise systems.
Honest craft
No shortcuts, no bloat. Clean architecture, maintainable code.
Partnership
We work with you, not for you. Your success is ours.
Modern tooling
We adopt what works. AI-assisted engineering lets us move faster and think deeper — not replacing expertise, but amplifying it.
Blog & Notes
Druckenmiller on AI
When an AI-detection tool flagged his WSJ op-ed “Let the Bond Markets Speak”, Stanley Druckenmiller had a refreshingly straightforward response:
“There’s a reason I moved from an English major to being an economics major,” Druckenmiller said. “I’m not embarrassed by it … I write everything using AI now for the same reason I use a calculator when I do math problems.”
ChatTJB
Where your questions get answered by a human.AI in Design Report 2026
How designers are evolving their tools, craft, and teams with AI: AI in Design.Decades
„There are decades where nothing happens; and there are weeks where decades happen." – attributed to LeninTrade
PT Sans
I was actually surprised to hear that PT Sans started as a Russian state project. It was commissioned in 2009 for the 300th anniversary of Peter the Great's script reform, with the goal of giving every language of the Russian Federation a free typeface.Can AI Simulate 8 Billion People?
Simile AI tries to find out.Claude sessions talking to each other …
… and coordinating is a strange experience.AI Watermarking
Claude and others are starting to mark or detect AI content to comply with EU transparency regulation in the AI Act (PDF).
The two approaches are opposites: Anthropic marks at the source, embedding an imperceptible watermark in generated text and attaching signed C2PA provenance metadata to files, while Substack (together with Pangram) works from the receiving end, letting readers run a statistical detector over published posts. Here's a paper describing watermarking for LLMs in detail.
The practice of using Claude to generate content even earned its own term: Claudefishing.
Let's talk.
Prefer email?
hello@alt-f4.de