architecture.service
High-load system architecture
Designing backends that stay reliable at scale — the iPOS platform serves 2M+ devices across 50K+ stores at 99.9% uptime.
GoNATSSQSRedisPostgresKubernetes
// hello, world. I'm
Huy N. Do.
Tech Lead · Backend Architect · QA Automation Engineer
Tech lead and backend architect with a QA automation background. I design systems that serve millions of devices reliably, automate testing and operations, and build IoT solutions for EV charging.
- devices served
- 2M+
- F&B stores
- 50K+
- uptime
- 99.9%
- EV charging stations
- 70+
- ✓ huydn › designs backends serving 2M+ devices
- ✓ huydn › keeps production at 99.9% uptime
- ✓ huydn › leads backend teams as tech lead
- ✓ huydn › automates web, hybrid & native mobile testing
- ✓ huydn › automates operations with scripts and CI/CD
- ✓ huydn › connects IoT devices over MQTT, WebSocket & OCPP
01
systemctl status — What I do best
# active (running)qa-automation.service
QA automation
Risk-based automated suites for web, hybrid and native mobile apps, integrated into CI so every change is verified.
SeleniumAppiumCucumberRSpecCI
scripts.service
Automation scripts
Any task done twice becomes a script: deployments, data jobs, reports and routine operations.
BashPythonGocronNode-RED
iot.service
IoT
Connecting devices to the cloud — EV charge points over OCPP/OCPI, MQTT and WebSocket messaging, NOTT wearables, ESP32 and Orange Pi 5, Node-RED and Home Assistant.
ESP32Orange Pi 5MQTTWebSocketOCPPOCPIHome Assistant
02
git log --career — Career timeline
# newest first2024
CHTLab · EVsafe ↗
Digital transformation and blockchain lab in Hanoi, home of NOTT; EVsafe was spun off from it.
2016
Gloco Ltd (Singapore)
Singapore health-tech company behind the MaNaDr telehealth app, with a development office in Hanoi.
2015
Platphorm, LLC
San Francisco company running the NiteFlirt, Everclear and Phrendly marketplaces.
2013
Vietsoftware · IBM ODC
IBM’s outsourcing development center in Hanoi, delivering on IBM Bluemix and Watson.
2011
Cốc Cốc
Vietnam’s home-grown web browser and search engine.
03
work/ — Work projects
# built for employers & clients7 projects · src/work
evsafe.work@ EVsafe ↗
EVsafe
Smart charging network for electric motorbikes and cars in Vietnam: charging and battery-swap stations, a driver app and a partner app for station owners. Charge points connect over OCPP/OCPI, devices over MQTT and WebSocket.
- EV charging stations
- 70+
- active users
- 3K+
nott.work@ CHTLab ↗
NOTT
AI-powered wellness DePIN platform: NOTT smartwatches and smart scales stream health data in real time, records are secured on a blockchain, and AI turns them into personal insights. A family health dashboard app with gamified challenges and rewards.
fabi.work@ iPOS.vn ↗
iPOS FABi
F&B sales management software for restaurants, cafés and milk-tea chains: POS, table split and merge, automatic promotions, MoMo, ZaloPay and VNPAY payments, GrabFood and ShopeeFood orders, role-based permissions and audit logs, plus the FABi Manager app for remote reports.
- devices served
- 2M+
- F&B stores
- 50K+
- uptime
- 99.9%
manadr.work@ Gloco Ltd (Singapore) ↗
MaNaDr
Singapore telehealth app: chat and video consultations with doctors, appointment booking, house calls, electronic medical certificates and medicine delivery, on iOS, Android and the web.
platphorm.work@ Platphorm, LLC
NiteFlirt · Everclear · Phrendly
Platphorm’s pay-per-minute marketplaces (San Francisco): NiteFlirt for phone and chat with independent experts, Everclear for guidance from advisors, and Phrendly for text, phone and video conversations.
bluemix.work@ Vietsoftware · IBM ODC
IBM Bluemix
IBM’s cloud platform-as-a-service, now IBM Cloud, together with Watson AI services, delivered for IBM and its clients worldwide.
coccoc.work@ Cốc Cốc ↗
Cốc Cốc
Vietnam’s home-grown web browser and search engine, with more than 22 million users at the time, covering browser, search, maps and ads.
04
side-projects/ — Side projects
# personal projects5 repos · src/side
shopme.sideshopme.vn ↗
Shopme
Multi-store commerce platform
Modular Go monolith with Next.js storefronts, running entirely on Cloudflare.
GoNext.jsCloudflarePostgres
tim-ngay-tot.sidetimngaytot.com ↗
Tìm Ngày Tốt
Lunar calendar & auspicious-day finder
PWA with an AI content pipeline that publishes daily articles through an ingest API.
Go EchoPWAAI crawler
mcp-chat.sidechat.huydn.dev ↗
MCP Chat
Chat app on Model Context Protocol
A chat client and a set of MCP servers that give the assistant real tools.
MCPLLMTypeScript
xiaozhi-realtime.side🔒 private
Xiaozhi Realtime
AI voice assistant on ESP32
A dedicated server for an ESP32 voice device: audio over WebSocket/Opus, conversation by OpenAI Realtime with MCP tools, configured from a mobile web app.
ESP32PythonOpenAI RealtimeMCP
huydn-dev.sidehuydn.dev ↗
huydn.dev
This site
A profile page that runs its own test suite on load. Astro on Cloudflare.
AstroCanvasCloudflare
05
package.json — Tech stack
# tools I use{
"languages": ["Go", "Ruby", "Python", "TypeScript", "Java", "Swift", "PHP"],
"backend": ["Echo", "Gin", "Rails", "Django", "Express", "Postgres", "Redis", "NATS", "SQS"],
"testing": ["Selenium", "Appium", "Cucumber", "RSpec", "Pytest", "TestNG", "Postman"],
"infra": ["Cloudflare", "AWS", "Docker", "Kubernetes", "Jenkins", "GitHub Actions"],
"automation": ["Bash", "Python", "Go", "cron", "Node-RED", "CI pipelines"],
"iot": ["ESP32", "Orange Pi 5", "MQTT", "WebSocket", "OCPP", "OCPI", "Node-RED", "Home Assistant"]
}
"languages": ["Go", "Ruby", "Python", "TypeScript", "Java", "Swift", "PHP"],
"backend": ["Echo", "Gin", "Rails", "Django", "Express", "Postgres", "Redis", "NATS", "SQS"],
"testing": ["Selenium", "Appium", "Cucumber", "RSpec", "Pytest", "TestNG", "Postman"],
"infra": ["Cloudflare", "AWS", "Docker", "Kubernetes", "Jenkins", "GitHub Actions"],
"automation": ["Bash", "Python", "Go", "cron", "Node-RED", "CI pipelines"],
"iot": ["ESP32", "Orange Pi 5", "MQTT", "WebSocket", "OCPP", "OCPI", "Node-RED", "Home Assistant"]
}
06
afk/ — Hobbies — away from keyboard
# away from keyboard* * * * *music --shuffle# Vietnamese lyrical, pre-war classics and bolero
0 20 * * 5sing --genre=bolero# Friday evening karaoke
0 6 * * 6,0tennis --doubles# weekend mornings, 5+ years
30 17 * * 2,4,6pickleball# Tuesday, Thursday and Saturday
0 22 * * *playstation --game=pes,mortal-kombat# PES and Mortal Kombat
*/15 * * * *lien-quan-mobile# Liên Quân Mobile in short breaks
0 21 * * 3cs2 --team# Wednesday team matches
Singing & music
Vietnamese lyrical songs, pre-war “tiền chiến” classics and bolero — for listening and for singing.
Trữ tìnhTiền chiếnBolero
Tennis & pickleball
Tennis for more than five years, pickleball for over a year, three sessions a week.
Tennis · 5+Pickleball · 1+
Gaming
PES and Mortal Kombat on PlayStation, Liên Quân Mobile on the phone and CS2 with friends.
PlayStationPESMortal KombatLiên Quân MobileCS2