Open to new projects

Thang Dang

Full-Stack Developer · Freelance

Freelance Full-Stack Developer with 15+ years experience — available for web, mobile, backend, CRM, e-commerce, AI automation and IoT projects.

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GitHub Ho Chi Minh City, Vietnam
15+Years of Experience
1,000+Enterprise Users
1M+Monthly Records Processed
6+Developers Led

I do not just write code — I build complete solutions

I am a Full-Stack Developer with multi-platform experience across PHP, Node.js, Python, and Go. I have built CRM, HRM, and e-commerce systems, RESTful APIs, microservices, and third-party integrations. I am strong in system architecture, Docker deployment, CI/CD, performance tuning, and running production environments.

Beyond web and business projects, I also build AI, IoT, and automation solutions — including Home Assistant integrations, face-recognition attendance systems, sales management, device monitoring, and internal admin platforms. With a flexible tech foundation, I can quickly adapt and choose the right language and framework for technical and business problems.

A strong fit for:

  • CRM, contact centers, and large-scale customer management systems
  • HRM, sales management software, and face attendance platforms
  • E-commerce with PrestaShop, WordPress, and WooCommerce
  • IoT, Home Assistant (HASS), and device automation
  • AI, chatbot, and workflow automation integrations into existing systems

A stack wide enough to own the full product lifecycle

Programming

PHP 7.x–8.xJavaScript ES6TypeScriptNode.jsReact.jsHTML5CSS3SCSS

PHP Frameworks & CMS

Yii2LaravelCodeIgniterPrestaShopWordPressWooCommerceElementor

Database

MySQLMariaDBPostgreSQLSchema DesignQuery Optimization

DevOps

DockerGitCI/CDNginxApacheRedisElasticSearch

Architecture & Delivery

REST APIJWTMicroservicesMessage QueueAgileScrumJira

Mobile

React NativeiOS & Android APIMobile Integration

IoT & Smart Home

Home Assistant (HASS)MQTTDockerDevice AutomationEnergy Monitoring

AI & Automation

OpenAI APIChatbotn8nCursorCodexWorkflow AutomationAI IntegrationPrompt Engineering

Career journey

  1. 2024 — Present

    Full-Stack Developer

    HRM · Sales · Attendance · AI · IoT

    • Building an HRM system, sales management software, and face-recognition attendance.
    • Integrating AI into operations — chatbots and workflow automation with OpenAI, n8n, Cursor, and Codex.
    • Deploying IoT with Home Assistant (HASS), MQTT, and Docker for smart home / lab environments.

  2. 2019 — 2024

    Technical Project Lead

    CRM Collection & SAWACO

    • Led a team of 6 developers building CRM Collection (Yii2, React Native) — 1,000+ users, 1M+ contracts/month.
    • Designed JWT-secured REST APIs and deployed with Docker on Ubuntu Server.
    • Led the SAWACO project — APIs connecting water utility customer systems to a care mobile app.
    • Ran delivery with Agile/Scrum and weekly sprint reviews.

  3. 2017 — 2019

    Project Lead

    E-commerce & Contact Center

    • Managed PrestaShop e-commerce rollouts — catalog, payments, and logistics APIs.
    • Led inbound/outbound contact-center CRM projects — 100+ agents, 50+ concurrent calls.
    • Coordinated teams and enterprise clients (HTVCoop, Lotteria, Sunstory).

  4. 2011 — 2017

    R&D Developer

    CRM · SMS · E-commerce Solutions

    • Researched and built solutions for CRM systems, SMS gateways, and e-commerce.
    • Developed customer management, care modules, and SMS automation.
    • Designed workflows integrating storefronts, customer data, and operational communication channels.

Active work and systems already shipped

In progress

HRM System

HR management system in progress — employee records, document approval workflows, and internal HR operations.

PHPLaravelREST APIMySQL

In progress

Sales Management System

Sales management software — orders, inventory, customers, revenue reporting, and internal sales workflows.

LaravelReact.jsPostgreSQLREST API

In progress

Face Attendance Platform

Face-recognition attendance platform — device sync, shifts, attendance reports, and HRM integration.

API IntegrationRealtime SyncFace RecognitionDashboard

Open Source

Tourna

Full-stack tournament operations for badminton and pickleball — registration, draws, scheduling, live scoring, standings, and brackets.

Next.jsReactTypeScriptPostgreSQLDrizzle

Open Source · IoT

TouchDeck

ESP32-S3 touch-deck firmware with LVGL, BLE media controls, a WebSocket bridge, OTA updates, and a macOS companion.

ESP32-S3C/C++LVGLTypeScriptElectron

IoT · Smart Home

Home Lab & IoT

Self-hosted IoT environment with Home Assistant (HASS), MQTT, and Docker — energy monitoring, device automation, and sensor integration.

Home AssistantMQTTDockerIoT

AI · Automation

AI Order Assistant

Order-processing chatbot with OpenAI, Node.js, and Telegram — from message intake and intent understanding to writing orders into the database.

OpenAINode.jsTelegramPostgreSQL

CRM · Enterprise

CRM Collection System

Debt collection CRM built with Yii2, React Native, and Docker — collection workflows for 1,000+ customers.

Yii2React NativeDockerJWTCRM

Mobile · API

SAWACO Customer Service

Customer-care mobile app for a water utility with REST APIs, billing history, payment reminders, and realtime lookups.

REST APIReact NativeRealtime Data

E-commerce

htvcoop.vn

PrestaShop e-commerce platform managing thousands of products, with payment and logistics integrations.

PrestaShopPaymentLogistics

CRM · Telephony

Contact Center Platforms

Contact-center CRM projects for HTVCoop, Lotteria, and Sunstory — supporting 100+ agents and 50+ concurrent calls.

CRMContact CenterInboundOutbound

Web · CMS

WordPress & WooCommerce Sites

Business and e-commerce websites including wtcbinhduong.vn, micebinhduong.com, luxurypalace.vn, and nesa.edu.vn.

WordPressWooCommerceElementorNginx

Let's Build Something Useful

I take freelance and longer-term engagements for real product problems: new builds, system upgrades, or process automation. If you need a Full-Stack Developer, let’s talk.

GitHub