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Llein-Dev/README.md

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Llein-Dev

Full-Stack & Systems Engineer

Building production software across Web, Desktop, AI, Computer Vision, Infrastructure & Hardware.


   

01 — Engineering Profile

Building across the stack

I build software systems where application architecture, performance, and real-world hardware meet.

My work ranges from full-stack platforms and backend services to Rust desktop applications, computer vision pipelines, video systems, and self-hosted infrastructure.

I care about:

  • Architecture that remains understandable
  • Performance that matters in real workloads
  • Systems that are observable and maintainable
  • UX that follows real user workflows
  • Practical integration between software and hardware

Engineering Domains

WEB & BACKEND

Next.js React Node.js Express Golang

SYSTEMS

Rust Tauri WebRTC WebCodecs Python

AI / COMPUTER VISION

YOLO OCR ONNX Runtime OpenCV

INFRASTRUCTURE

Docker Linux Nginx MinIO

HARDWARE & PROTOCOLS

ONVIF RTSP TCP Serial IoT


02 — Technology

Languages

Web & Backend

Systems & Infrastructure

AI / Computer Vision

Video / Network / Hardware


03 — Selected Systems

ANPR Vision Core

Real-time license plate recognition & vehicle tracking

A computer vision pipeline focused on vehicle detection, license plate recognition and spatial tracking.

Core

  • Rust inference pipeline
  • YOLO vehicle / plate detection
  • OCR recognition
  • ONNX Runtime
  • Real-time tracking
  • Frame processing optimization

Rust YOLO ONNX OCR

VMS Desktop Client

Desktop video management & camera control

A native desktop client for multi-camera monitoring and hardware integration.

Core

  • Tauri + Rust architecture
  • React frontend
  • WebRTC / RTSP video
  • WebCodecs playback
  • ONVIF discovery
  • PTZ camera control

Tauri Rust WebRTC ONVIF

TSI Vanthu

Enterprise document & storage platform

A business file platform built around S3-compatible object storage.

Core

  • Next.js frontend
  • Express backend
  • PostgreSQL
  • MinIO S3
  • Presigned URL uploads
  • Nginx reverse proxy

Next.js Express MinIO PostgreSQL

Smart Parking

AI-powered parking access control

A parking system combining computer vision, license plate recognition, cameras and hardware workflows.

Core

  • Vehicle detection
  • License plate OCR
  • Camera integration
  • Vehicle sessions
  • Parking access control
  • Mobile client integration

AI OCR Camera Mobile


04 — What I Build

WEB

Applications



Next.js
React
Node.js
Express
PostgreSQL

SYSTEMS

Desktop



Rust
Tauri
WebRTC
WebCodecs
Video

AI / CV

Intelligence



YOLO
OCR
ONNX
Tracking
ANPR

INFRA

Operations



Docker
Linux
Nginx
MinIO
Networking


05 — Engineering Principles

Architecture

Build around clear boundaries.

  • SRP
  • SOLID
  • Feature-oriented structure
  • Explicit dependencies
  • Minimal abstraction

Performance

Optimize where workload demands it.

  • Efficient pipelines
  • Async processing
  • Resource-aware systems
  • Real-time workloads
  • Hardware acceleration

Product

Software exists to solve workflows.

  • Practical UX
  • Stable behavior
  • Observability
  • Maintainability
  • Real-world constraints

Simple where possible. Explicit where necessary.


06 — GitHub Activity


07 — Currently Exploring

Distributed Systems   Edge Computing   AI Systems

Microservices   IoT   Computer Vision


Llein-Dev

Building software that connects applications, systems, intelligence and hardware.




Pinned Loading

  1. Waveshare-Modbus-POE-ETH-Relay-WebUI-API-Controller Waveshare-Modbus-POE-ETH-Relay-WebUI-API-Controller Public

    A lightweight Node.js Express Server & WebUI designed to control the Waveshare Modbus POE ETH Relay (8-Channel) via Modbus TCP. Features a clean web control interface, persistent JSON configuration…

    HTML

  2. minio-image-worker minio-image-worker Public

    MinIO Image Worker là một giải pháp background worker chuyên dụng được thiết kế cho hệ sinh thái MinIO / S3 Object Storage (Synology NAS, Cloud S3, AWS S3).

    JavaScript

  3. Cau-truc-roi-rac-MA004.F22.LT.CNTT Cau-truc-roi-rac-MA004.F22.LT.CNTT Public

    Công cụ hỗ trợ giải & tra cứu Cấu trúc Rời rạc (MA004 / CTRD) UIT – Tự động hóa Karnaugh, Sơ đồ mạch Logic, Dijkstra, Kruskal & Đề thi thử. Hoạt động Offline (PWA).

    JavaScript

  4. express-nodejs-backend-architecture-starter-template-boilerplate express-nodejs-backend-architecture-starter-template-boilerplate Public

    Production-ready Node.js & Express.js Backend Starter Template. Clean Architecture featuring Modular Structure, Database Config, Custom Middleware, JWT Auth & User Controllers.

    JavaScript 1

  5. operational-qa-auditor operational-qa-auditor Public

    Operational QA Auditor is an open-source, prompt-engineered skill and operational cheatsheet that teaches AI agents to think, inspect, debug, and report like Principal QA Engineers and Reliability …

  6. ParkingMobile ParkingMobile Public

    AI-powered Smart Parking Management System with License Plate OCR, Mobile POS, Web Admin, RBAC and Multi-Tenant SaaS architecture.

    JavaScript