Senior Software Developer — Tokyo

Building digital experiences that matter.

Innovative Senior Software Engineer with 8+ years of experience in full-stack development, specializing in TypeScript, React, and NestJS. Proven track record in leading cross-functional teams, implementing scalable microservices, and driving DevOps practices.

ExaWizards Inc.
Tokyo, Japan
8+ Years Experience
View My Work → Contact Me
Scroll
Developer workspace in Tokyo

About

Developer, Leader,
Tokyo-based Engineer

Senior Software Engineer with 8+ years building production-grade applications. Currently Frontend Tech Lead at ExaWizards, shipping a GenAI platform integrating OpenAI, Claude, and Gemini. Previously at ZEALS leading Japan's #1 conversational commerce platform serving 1.5M+ monthly users.

Fluent in Vietnamese (Native), English, and Japanese (JLPT N2). When not coding, you'll find me exploring Tokyo's food scene or working on the next side project.

TypeScriptJavaScriptGoReactNext.jsNestJSVue.jsPostgreSQLRedisDockerKubernetesAWSGCPGraphQLPlaywright
0
Years Experience
0
Landing Pages
0
Enterprise Products
0
Languages (EN/JP/VN)

Experience

Where I've Worked

Frontend Tech Lead

Dec 2024 — Present
ExaWizards Inc. · Tokyo, Japan
  • Spearheaded zero-to-one product development, launching market-ready beta within 6 months
  • Engineered GenAI platform integrating OpenAI, Anthropic Claude, Google Gemini with Next.js/Django on AWS
  • Directed 3-developer team using React Router v7 and architected design system modernization strategy
ReactNext.jsDjangoAWSGenAI

Engineering Manager / Adviser

Nov 2021 — Present
Oven · Tokyo, Japan
  • Built offshore engineering org from 0 to 10+ developers, achieving 40% cost optimization
  • Implemented Scrum methodology, accelerated delivery velocity by 60%
Team LeadScrumOffshoreProcess

Senior Software Engineer / Tech Lead

June 2019 — Dec 2024
ZEALS · Tokyo, Japan
  • Led JS→TS migration across full stack, reducing bugs by 40%
  • Architected micro-frontend structures for large React apps; optimized performance, cutting load times by 50%
  • Migrated form microservice Express.js→Go, 70% faster processing, 99.99% uptime
  • Built reusable component library with Material-UI + Storybook
ReactNestJSGoTypeScriptMicro-frontends

Software Engineer

June 2019 — May 2020
ZOOOG · Tokyo, Japan

Developed user management dashboard with NestJS, 50% admin efficiency improvement. Implemented JWT auth and RBAC systems. Onsite at ZEALS as contract.

NestJSTypeScriptJWTREST API

Software Engineer

Jan 2018 — June 2019
TMA Solutions · Vietnam

Developed web applications using AngularJS. Key communicator bridging dev team and international clients.

AngularJSCommunicationAgile

Software Engineer

Jan 2017 — Nov 2017
Atmarkcafe Vietnam · Vietnam

Built HOKEN insurance app features with Ruby on Rails, Go, and Vue.js on PostgreSQL.

RailsGoVue.jsPostgreSQL

Professional Work

Products I've Built

LinkedIn Profile →

GenAI Platform

AI Platform

Multi-LLM platform integrating OpenAI, Claude, and Gemini. Zero-to-one product launched as market-ready beta within 6 months at ExaWizards.

Next.jsDjangoAWSAI

Chat Commerce Platform

SaaS Platform

Japan's #1 conversational commerce SaaS. Served 1.5M+ monthly active users across LINE, Instagram DM, Facebook Messenger. 9.6% avg conversion rate.

ReactNestJSGraphQL

Micro-Frontend Architecture

Architecture

Architected large-scale React apps enabling independent deployment of frontend modules. Cut load times by 50% via code splitting and lazy loading.

ReactWebpackSSR

Form Automation Service

Microservice

Migrated from Express.js to Go with Pub/Sub integration. Achieved 70% faster processing and 99.99% uptime.

GoPub/SubMicroservices

Design System

Component Library

Reusable component library with Material-UI and Storybook. Reduced dev time by 35% with consistent UI/UX across products.

StorybookMUIDesign System

Offshore Engineering Org

Leadership

Built high-performing team from 0 to 10+ developers. 40% cost optimization, 60% faster delivery through Scrum transformation at Oven.

ManagementScrumScaling

Get In Touch

Let's build something
together.

Open to senior engineering roles, tech leadership opportunities, and interesting conversations about software, AI, and architecture.

knguyen30111@gmail.com LinkedIn GitHub