# Yuehan John

> Personal site of Yuehan John (also known as John Dai, Yuehan Dai), an AI-native developer and founder based in Turku, Finland. He builds AI agents, RAG pipelines and full-stack LLM products, currently as AI Developer at Kokit and founder of Since Labs. Available for freelance and full-time work.

Every page on this site has a clean markdown version: append `/index.md` to its URL (for the home page, use `/index.md`). The complete site in a single file is at https://yuehanjohn.com/llms-full.txt.

## Pages

- [Home](https://yuehanjohn.com/index.md): Profile overview: bio, capabilities, track record, recent writing
- [History](https://yuehanjohn.com/history/index.md): Full career timeline 2015–present and every company/organization
- [Reviews](https://yuehanjohn.com/reviews/index.md): Written recommendations from co-founders, colleagues and clients
- [Blog](https://yuehanjohn.com/blog/index.md): Index of all articles
- [Contact](https://yuehanjohn.com/contact/index.md): How to reach Yuehan John: booking link, email, WhatsApp

## Blog posts

- [My Stack: Agents, Servers, and the Tools I Actually Use](https://yuehanjohn.com/blog/my-stack/index.md) (2026-09-26): Hermes Agents for long tasks, OMP for coding, OpenRouter for models (free ones for easy work, GLM-5.3-Flash for heavy work), Hetzner (budget) or AWS m7i.large (bigger budget) with at least 8GB of RAM, Cloudflare for domains, Coolify to manage it all, Beszel to watch it, Honcho for memory, a self-built agent manager on top, and free ChatGPT/Claude/Gemini on my phone for quick questions.
- [Sites I Take Inspiration From](https://yuehanjohn.com/blog/sites-i-take-inspiration-from/index.md) (2026-09-26): My bookmarked sources of UI inspiration, grouped by what I use them for: component libraries, animation, icons and loaders, color, and design galleries.

## Contact

- Book a call (30 min, Google Meet): https://calendar.app.google/6s3JjxNhkb5ppTe56
- Email: yuehan.dai.john@gmail.com
- WhatsApp: https://wa.me/358403633893
- LinkedIn: https://www.linkedin.com/in/yuehanjohn
- GitHub: https://github.com/yuehanjohn

## Optional

- [Full site as one file](https://yuehanjohn.com/llms-full.txt): every page and blog post concatenated
- [Sitemap](https://yuehanjohn.com/sitemap.xml)
- [Posts as JSON](https://yuehanjohn.com/api/posts): metadata for all blog posts