Dau The Tien - Software Engineer
Full-Stack Developer with 7+ years of experience in Ruby on Rails and 2+ years in ReactJS. Skilled in building scalable web applications and APIs, improving performance, and delivering clean, test-driven code. Experienced across backend, frontend, CI/CD, and cloud deployment (AWS, Heroku).
Technical skills
- Programing Languages
- Frameworks / Libraries
- Cloud platforms
- Server administration
- Storage
- Tools
- Paradigms
- Event-driven Development, Test-driven Development, Object-oriented Programming, Model-View-Controller
Work Experience
Dealer Studio
Intermediate Software Engineer - Rails and ReactJS
Oct 2025 - Present
Australia
Global Health
Fullstack devloper - Ruby on Rails
May 2023 - Sept 2025
Melbourne, Australia
Employment Hero
Fullstack devloper - Ruby and ReactJS
April 2020 - May 2023
Ho Chi Minh City, Vietnam
Symphony Creative Solution
Fullstack developer - Ruby and ReactJS
Sept 2018 - Feb 2020
Ho Chi Minh City, Vietnam
Vinova
Fullstack developer - Ruby on Rails
Jun 2017 - Jan 2018
Ho Chi Minh City, Vietnam
Personal Projects
Tradies Platform
A multi-tenant SaaS for trade and service businesses, covering the full lead → quote → deposit → job → invoice → payment lifecycle.
- Built a Rails 8 API and React 19 (Vite + TypeScript + Tailwind) frontend, with every record scoped per organisation for multi-tenant isolation.
- Developed an AI chat-to-quote flow with OpenAI function calling, turning a public visitor conversation into a structured lead and draft quote with line items and deposits.
- Added AI-assisted blog authoring with image upload and embedding, plus sitemap and robots.txt generation for SEO.
- Integrated Stripe Checkout and webhooks for deposits and invoice payments, and Google Reviews for reputation display.
- Implemented Devise + JWT authentication with Google OAuth, Sidekiq + Redis background jobs, and Alba serializers.
- Deployed to a VPS with Kamal, and enforced a green-check gate of RSpec, RuboCop, Brakeman, ESLint, and production build before every push.
DealHub
A web application displaying updated deals from Australian online stores, with a car insurance price comparison feature.
- Built a Rails + ReactJS app for deal aggregation and insurance comparison, featuring automated scraping, CI/CD, and number plate lookup.
- Designed Material Design-inspired UI and deployed frontend to Vercel.
- Integrated APIs including Facebook Graph and Slack.
DWF
A distributed workflow runner using Sidekiq and Redis
- Developed a distributed workflow runner using Sidekiq and Redis for efficient background processing.
- Implemented comprehensive test suite with RSpec and CI/CD pipeline using GitHub Actions.
- Published as the RubyGem 'dwf' with clear documentation, gaining significant community adoption.
TopLand
A real estate statistics application for Ho Chi Minh City, Vietnam
- Built a ReactJS/Redux/Rails real estate statistics app for Ho Chi Minh City.
- Deployed API to Azure VPS using Capistrano and frontend to Heroku.
- Implemented Material Design UI with daily data scraping via Sidekiq.
- Configured CI/CD with CircleCI, Nginx, Puma, and Let's Encrypt.
- Integrated Facebook Graph API, Google Analytics, Skylight, and Slack.
