Professional Experience
English Vocabulary Learning App Development
Period
Jan 2023 – Present (Side project since May 2025)
Description
An English vocabulary app that emphasizes both “game-like fun” and “effective learning results.”
Role
- CTO / Tech Lead - New business planning - Full-stack development - Offshore development with Vietnam (English communication) - Hiring - Mentoring
Tech Stack
Devin, Go, echo, Unity, C#, Azure (Container Apps, MySQL, Functions, Front Door, WAF, App Insights, Log Analytics, Blob), Cloudflare(Load Balancing, WAF) OpenAPI
Team Size
1–8
Achievements
Co-founded an EdTech startup and led all aspects of product planning, design, development, and operations as CTO/Tech Lead. Built a remote team with three offshore Vietnamese engineers and launched the MVP in a short time. Strengthened the internal dev team, delegated responsibilities based on skill levels, and introduced scalable architecture and CI/CD for quality and velocity.
NFT Marketplace Development
Period
Oct 2022 – Dec 2022
Description
Developed an NFT marketplace on a major domestic blockchain.
Role
- Backend Engineer - Led new feature development
Tech Stack
HTML, CSS, TypeScript, Vue.js, Go, echo, Solidity, AWS (ECS, RDS, Lambda, CloudWatch), OpenAPI, Terraform
Team Size
8
Achievements
Despite the short tenure, led the development of key new features through collaboration with related members.
LINE NFT / Ethereum dApps Development
Period
Mar 2022 – Jul 2022 (Solo freelance)
Description
Issued NFTs for a sports team using LINE NFT.
Role
- Web Application Engineer - NFT development on LINE Blockchain and Ethereum
Tech Stack
HTML, CSS, JavaScript, Go, echo, Render, LINE Blockchain, Solidity
Team Size
1
Achievements
Successfully released a time-limited NFT and built a robust system that handled high access at launch.
Investment x SNS Mobile App Development
Period
Oct 2021 – Sep 2022
Description
Developed an SNS app focused on investment (selected for "Top 100 Startups").
Role
- Scrum Master - Backend Engineer - Led multiple feature developments
Tech Stack
Flutter, Go, echo, Solidity, AWS (ECS, ECR, RDS, CloudWatch, Secrets Manager), OpenAPI, Terraform
Achievements
Joined early-stage team, introduced Scrum, launched efficient MVP. Built clean and long-lasting codebase. Internal communication was in English due to multinational team.
Industry-specific ERP Development
Period
Sep 2020 – Mar 2022 (Side project since Oct 2021)
Description
ERP development for a traditionally non-IT industry.
Role
- Backend Lead Engineer - Frontend development & AWS infrastructure - Tech selection - Feature development
Tech Stack
HTML, CSS, TypeScript, React.js, Go, echo, Python, AWS (EC2, Lambda, RDS, ECS, Step Functions, CDK, etc.), OpenAPI, Clean Architecture
Team Size
4–8
Achievements
Started from scratch, selected tech stack, built architecture, and drove productivity as a Scrum team.
Excel to Database Migration Project
Period
Jul 2020 – Aug 2020 (Side project in Jul 2020)
Description
Migrated data from Excel to a structured database.
Role
- Web Application Engineer - Developed frontend and backend for migration tools
Tech Stack
HTML, CSS, JavaScript, Vue.js, PHP7, Laravel6, PHPUnit, AWS (EC2, CodeCommit), Cypress
Team Size
7
E-Commerce Site Development & Maintenance
Period
Feb 2019 – Jul 2020 (Side project until Jul 2019)
Description
Maintained an EC site handling ¥3.1B annually across 115 countries (auto & motorcycle parts).
Role
- Web Application Engineer - Full-stack development - Bug fixing - New feature implementation - Task and stakeholder management
Tech Stack
HTML, CSS, JavaScript, Backbone.js, Vue.js, Java8, Spring3, PHP5, CakePHP2, Jenkins, CircleCI, AWS (EC2)
Team Size
3–7
Achievements
Improved productivity and team functionality by streamlining workflows and communication with stakeholders.
Private Cloud Infrastructure Build
Period
Nov 2017 – Jul 2019
Description
Planned and built a private cloud for a corporate group of 200,000+ employees.
Role
- Infrastructure Engineer - PM/PL - Cost planning, procurement, progress/task/risk management - System design, server evaluation, Ansible automation - Mentored a French intern - Internal trainer for IT infrastructure
Tech Stack
VMware, OpenStack, Ubuntu, MaaS, Ansible
Team Size
6–12
Achievements
Led ¥100M-scale service build project. Gained top-tier performance rating in second year.
Software Quality Analysis System
Period
Jul 2017 – Oct 2017
Description
Developed a quality analysis system for software development.
Role
- Web Application Engineer - Team Leader - Managed progress/tasks - Handled both frontend/backend development and testing
Tech Stack
HTML, CSS, JavaScript, Backbone.js, Java, JUnit, Jtest, Macchinetta
Team Size
25
Achievements
Successfully led the project. Introduced chat tools to improve communication.
Internal Tool Development
Period
Feb 2015 – Mar 2017 (During university)
Description
Interned as an internal system engineer and developed internal tools.
Role
- Long-term intern - Developed internal web tools (leave ledger, time sheet) - Introduced JIRA
Tech Stack
HTML, CSS, JavaScript, PHP, Laravel, VBA
Team Size
3
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