My GitHub contributions

I've been building for the web since 2001. Lately, with AI.

Frontend, then UX, then product — and now Product Manager at enercity. Evenings and weekends I write MCP servers, Claude skills and small tools, because I would rather build the thing than write a ticket for it.

01 — Sidequests

35 things I made, most of them recently.

I connected my house to an LLM — heat pump, solar, inverter, car, wallbox, vacuum. Then I kept going: auditing skills, a news engine that writes itself, nine website templates, a handful of games, and Hannover's first Claude meetup.

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Gamescape
A 2 × 2 km Nordic landscape built with AI. Walk, fly a drone, watch the weather turn.
- three.js
- Blender
Open project
Claude Community Hannover
Home of the first Claude Community meetup in Hannover, 21 January 2027.
- HTML
- Community
Open project
Leine Kart
A kart race through Hannover's city centre, built from OpenStreetMap. Split-screen for two.
- TypeScript
- three.js
Open project
Zaptec MCP
Charging status, history with cost, and pause or resume for a Zaptec wallbox.
- Python
- MCP
- ★ 1
Code
holger1411/unofficialzaptecMCP
ASTRODECK
An Astro starter kit built for working alongside AI.
- Astro
- Tailwind
- ★ 73
Open project Code
AUROALIS
Landing page and article layout behind an animated WebGL aurora.
- Tailwind 4
- WebGL
Open project Code
BROOK 2
A minimalist Astro blog. Typography first, everything else second.
- Astro
- Tailwind
- ★ 16
Open project Code
COCOON
A dark one-pager for consultancies. No framework, no build step.
- Tailwind 4
- Vanilla JS
Open project Code
TemplateDeck
My own shop for website templates. Nine of them so far, free and premium, all built to the same standard.
- Astro
- Tailwind
Open project
Vaillant MCP
Read-only access to MyVaillant heat pumps.
- Python
- MCP
Code
holger1411/unofficialMCP4Vaillant
bfsg-skill
Audits sites against BFSG, EN 301 549 and WCAG 2.1 AA.
- Claude Skill
- A11y
Code
holger1411/bfsg-skill
Roborock MCP
Status, room cleaning and vector floor maps for the vacuum in my flat.
- Python
- MCP
- ★ 1
Code
holger1411/roborock-mcp
scroll-world-kie
Scroll-scrubbed camera flights through a generated world. A port of the Higgsfield skill to Kie AI.
- Claude Skill
- Kie AI
Code
holger1411/scroll-world-kie
Engensen 3D
My village as an interactive 3D model, fed by live weather and air data.
- TypeScript
- WebGL
Open project Code
FoxESS MCP
Inverter and battery readings from FoxESS.
- Python
- MCP
- ★ 2
Code
holger1411/foxess-mcp-server
Horde30938
A zombie horde overruns my postcode. You defend it from an AC-130.
- WebGL
- Game
Open project
KLAR
A clean, aesthetic company template.
- Bootstrap
- HTML
- ★ 39
Open project Code
SolarEdge MCP
Solar production data from the SolarEdge Monitoring API.
- Python
- MCP
Code
holger1411/unofficial-solaredge-mcp
vibe2prod
A production-readiness auditor for AI-generated websites. Ten categories, one verdict.
- Claude Skill
- Node
- ★ 1
Code
holger1411/vibe2prod
ClaudeRPG
A role-playing game you play with Claude as the dungeon master.
- Claude Skill
- Game
- ★ 3
Code
Polestar MCP
Range, charge state and trips from a Polestar.
- Python
- MCP
Code
BROOK
An ultra-clean blog template for a hyper-focused blog.
- HTML
- SCSS
- ★ 47
Open project Code
cosmicmind
An LLM-maintained wiki compiler built on Astro.
- TypeScript
- Astro
Code
holger1411/cosmicmind
DECK
A simple, fast personal website template.
- Bootstrap 5
- HTML
Open project Code
Qaike
A shooter.
- WebGL
- Game
Open project
STRIDE
A landing page for startups and tech companies.
- Bootstrap
- HTML
- ★ 64
Open project Code
APEX
AI-first B2B SaaS template. 16 pages, 24 sections, four landing variants.
- Tailwind 4
- Premium
Open project
Hab ich ein Smart Meter?
Photograph your electricity meter. A model tells you what it is.
- Vision
- Next.js
Open project
What's up Claude
Every Claude Code release of the last 28 days, on one screen.
- Next.js
- Dashboard
Open project
Clauding
German-language AI news, gathered and written automatically. Every day.
- Astro
- LLM
Open project
Minimal Design System
A black-and-white design system Claude can prototype with.
- Claude Skill
- CSS
- ★ 7
Open project Code
LighthouseRobot
Daily Lighthouse audits for any site, free. Ships with its own MCP server.
- Next.js
- MCP
Open project
Meetquence
Random speaking order for meetings, with a timer. Ends the awkward pause.
- Astro
Open project
11straps
Eleventy plus Bootstrap 5. Served well, retired now.
- Eleventy
- Bootstrap
- ★ 126
- abandoned
Code
holger1411/11straps
Understrap
A WordPress starter framework. Sold in 2019.
- WordPress
- PHP
- abandoned
Understrap

02 — Certified by

- AI Fluency: Framework & Foundations
- Model Context Protocol: Advanced Topics
- Introduction to Agent Skills
- Introduction to Subagents
- Introduction to Large Language Models
- Agentic AI Explained
- Product Design by Google
- UX Management & Strategy
- CPUX-F — UXQB Certified Professional for UX, Foundation Level
- Certified UX & Usability Specialist
- Docker & Containers — Advanced
- UX Strategy Fundamentals

03 — Path

Twenty-five years, backwards.

2023 — now
Product Manager, Customer Platform & App
enercity AG · Hannover
Bringing AI into production at a regulated energy utility.
2019 — 2023
Senior UX Designer
enercity AG · Hannover
2014 — 2019
UX & Frontend Architect, Team Lead
smartsteuer GmbH · Hannover
2005 — 2014
Founder
Pixelsparadise · Hamburg
2001 — 2019
Frontend Developer & UI Designer
Freelance
Where it started.

04 — Elsewhere

If you want to talk, email is best.

office@holgerkoenemann.de

I've been building for the web since 2001. Lately, with AI.

35 things I made, most of them recently.

Gamescape

Claude Community Hannover

Leine Kart

Zaptec MCP

ASTRODECK

AUROALIS

BROOK 2

COCOON

TemplateDeck

Vaillant MCP

bfsg-skill

Roborock MCP

scroll-world-kie

Engensen 3D

FoxESS MCP

Horde30938

KLAR

SolarEdge MCP

vibe2prod

ClaudeRPG

Polestar MCP

BROOK

cosmicmind

DECK

Qaike

STRIDE

APEX

Hab ich ein Smart Meter?

What's up Claude

Clauding

Minimal Design System

LighthouseRobot

Meetquence

11straps

Understrap

02 — Certified by

Twenty-five years, backwards.

If you want to talk, email is best.