Tung Nguyen Duy

Summary

Full-stack Software Engineer, nearly 3 years shipping production web applications for international clients, fully remote. Backend-focused: Ruby on Rails, Laravel, NestJS, Java/Spring Boot, PostgreSQL, MySQL, TypeScript, React, Vue. Most of my work is backend: building and maintaining features in long-running production systems, optimising slow queries and page loads once real data arrives, and owning the CI/CD and deployment pipelines my team ships through. Open to contract or full-time remote roles, async and writing-first. Based in GMT+7 — full overlap with European business hours, and up to four hours with US Eastern.

Work Experience

MOOBON, Inc.Jun 2024 – Present

Software EngineerRemote, Full-time

Developed and maintained 5+ production applications using Ruby on Rails, Laravel, Vue.js, Flutter, and MySQL for Japanese clients
Migrated a legacy Rails application from EC2 to containerized ECS; provisioned AWS infrastructure with Terraform
Automated CI/CD with GitHub Actions and Docker; deployed applications on AWS ECS Fargate; reviewed code and enforced standards across teams

Rikkeisoft Co., Ltd.Feb 2023 – Jun 2023

Backend Developer InternVietnam, Part-time

Developed backend services and APIs for the Canbus low-code platform using Java, Spring Boot, and MongoDB
Collaborated with developers, QA engineers, and project managers in an Agile environment; reported directly to Japanese clients

Projects

Ecologynet — Waste-Management and Electronic-Manifest Platform Aug 2024 – Present

Software Engineer, team of 5 · Ruby on Rails 7.2, MySQL 8, Redis, Hotwire, Docker, AWS ECS Fargate

Took a manifest list from 11.7s to under 1s and licence matching from 2.7s to 1.2s on a 20+ GB, 50+ table production database — query-plan fixes, targeted indexes, and removing N+1 queries
Maintained JWNET/EDI integration, two-factor authentication, and hierarchical multi-tenant authorization; built scheduled manifest jobs and high-volume CSV/PDF export

Adidas mi-uniform · mi-uniform.adidas.jp Nov 2025 – Aug 2026

Full-stack Developer, team of 8 · PHP, Laravel 12, Vue 3, Inertia.js, MySQL, Redis, Docker, Nginx

Built order-management workflows across Adidas, retailer, and supplier roles; multi-order PDF export and automated technical documents
Extended the SVG-based uniform simulator and hardened order data entry, validation, and delivery tracking

PDFlex — Bilingual PDF Reader with OCR and Document AI · pdflexai.com Jun 2025 – Aug 2026

Personal project · Next.js, NestJS, PostgreSQL, TypeORM, OCR, Docker, Nginx

Built the full stack solo — Next.js frontend, NestJS API, PostgreSQL, OCR service — around a layout-preserving translation pipeline that mirrors the original page
Implemented streamed AI translation, document chat over SSE, and permissioned share links; closed three access-control gaps in a security pass

Education

Hanoi University of Science and Technology2019 – 2024

HEDSPI — Vietnam–Japan ICT Engineer Program (IT-E6), Information TechnologyTechnical GPA 3.58 / 4.0

Skills, Languages & Certifications

ProgrammingRuby, PHP, TypeScript, JavaScript, Java, Dart, Rust, SQL BackendRuby on Rails, Laravel, NestJS, Node.js, Express.js, Spring Boot Frontend & MobileReact, Next.js, Vue 3, Inertia.js, Hotwire/Stimulus, Flutter, Tauri Databases & ORMPostgreSQL, MySQL, MongoDB, Redis, ActiveRecord, Eloquent, Prisma, TypeORM, Drizzle Cloud & DevOpsAWS (ECS, ECR, ALB, S3, CloudWatch), Terraform, Docker, GitHub Actions, Nginx, Linux Testing & QualityRSpec, PHPUnit, Jest, RuboCop, Brakeman, Sentry LanguagesEnglish (conversational) · Japanese (conversational) · Vietnamese (native) CertificationFundamental Information Technology Engineer Examination (FE) — IPA Japan, Apr 2023