MetaStacker LabConvergence
Products that combine embedded devices, mobile apps and AI services, designed end to end.
We build technology, secure it, and explain it.
MetaStacker Lab works where hardware, software and AI meet. We design connected products, review their security, write practical technical books, and help teams put these pieces to work.
Our services Our bookServices
Four areas, one way of working: start from a real product, keep it simple, and write down what we learn.
Security
Secure design and review for devices and apps: keys and secrets, signed firmware, BLE and local-network access.
Publishing
Hands-on technical books that walk readers through building something real, step by step.
Consulting
Practical advice on adopting AI tools, building IoT products, and making them secure.
Publishing
Our first book shows how to build a family AI speaker from scratch with Claude Code.
Building Our Home AI Speaker with Claude Code
A family voice assistant without a server
Build a voice assistant on the Waveshare ESP32-S3-AUDIO-Board, together with Claude Code. The book covers the ESP-IDF firmware, a Flutter companion app, OpenAI and Gemini voice models, and the prompts and harness used at every step.
- ESP32-S3 firmware: wake word, voice conversation, internet radio, reminders
- Flutter app: first-time setup over BLE, control over the home network
- No server of your own: keys stay on the speaker
- Every prompt in the book, plus the finished source code
Contact
For projects, consulting or publishing, send us an email.
- Address
- 877 Gwangmyeong-ro, Republic of Korea