Full-stack products
Web apps and APIs carried from first commit to production: Shopify apps for the Japan market, ERP and logistics platforms where the route from warehouse to doorstep has to just work.
FULL-STACK & CLOUDSOLO BUILDEREND-TO-END
I'm Hoang Phi Son, a full-stack developer and cloud solution architect with 10+ years of experience, the last 9 building web apps and APIs for Japanese clients. Now a Tech Lead leading five engineers, still hands-on every day: I design the system, write the code, and run the multi-cloud infrastructure it ships on, with Terraform. Lately, LLM applications with RAG and LangChain too.
What I build
Cloud architecture & infrastructure
Systems designed and provisioned with Terraform across AWS, Azure, and GCP, from cost planning to CI/CD. Kept lean: one migration cut infrastructure costs to a third.
AI & LLM applications
LLM chatbots running in production, public SaaS and internal assistants: RAG over 50+ documents, built with LangChain and LangGraph. Real products, not demos.
The stack I carry alone
Solo means every layer of it is mine to build and run.
Languages
- JavaScript
- TypeScript
- PHP
- Python
- Go
- SQL
Backend
- Node.js
- NestJS
- Hono
- Express.js
- Laravel
- GraphQL
- MySQL
- PostgreSQL
Frontend
- React
- Angular
- Astro
- Tailwind CSS
Cloud & DevOps
- AWS
- Azure
- Google Cloud
- DigitalOcean
- Cloudflare
- Kubernetes
- Docker
- Terraform
- GitHub Actions
- GitLab CI
- Vercel
AI & LLM
- OpenAI API
- Claude API
- RAG
- LangChain
- LangGraph
- Vector databases
Practices
- Agile/Scrum
- Code review
- Mentoring
Hobby projects
Small tools I wanted, couldn't find, so I built and shipped them.
macOS · Swift
Smack Mac
Smack your MacBook, hear a sound. The app reads the built-in accelerometer via IOKit and plays one of nine sounds. Built with SwiftUI and AVFoundation, zero third-party dependencies.
smackmac.sonhp.devWeb · React + ViteLongpost
Facebook cuts long posts to a "See more" link. Longpost renders the full text as a 1080 × 1080 PNG the feed shows in full: auto-fit text, font and background presets, all in the browser.
lp.sonhp.devWeb · React + ViteMxDrop
Signup walls want an email you'd rather not hand over. MxDrop hands you a disposable inbox instead: no registration, no setup, read the mail that arrives, then walk away.
mxdrop.eu.ccAPI · Cloudflare WorkersIP Lookup
The page is the API. Visit in a browser for your IP, ASN and geolocation, or send Accept: application/json and get the same data back: no key, no quota, CORS-open, edge-cached.
ip.sonhp.devFrom the blog
All postsGot an idea? Let's build it.
One email is all it takes to start. I usually reply within a day.