Atsuo Koizumi, Senior Full Stack Engineer - Web3 & AI

About

Versatile and results-driven Senior Full Stack Engineer with 8+ years of experience delivering scalable, high-performance web and mobile applications across diverse domains. Adept in a wide array of technologies including JavaScript/TypeScript, PHP, Python, Go, Rust, and Solidity. Expertise spans frontend frameworks like React.js, Next.js, Vue.js, Angular, and backend technologies including Node.js, Nest.js, Django, and Spring Boot. Proficient in database design and optimization using PostgreSQL, MySQL, and MongoDB, and skilled in building robust CI/CD pipelines, containerized deployments with Docker, and cloud functions on AWS Lambda. A collaborative team player with a proven record of mentoring developers, enhancing development workflows, and architecting user-centric solutions in Agile environments.

Experience

GreatDealCoin

May 2024 – May 2025

Senior Software Engineer - Web3 & AI

● Built AI-powered dApps using React.js, Nest.js, TypeScript, and blockchain integrations ● Engineered decentralized features with Solidity, integrating smart contract data into frontend UIs ● Developed microservices in Python for AI processing and Redis-based task queues ● Streamlined Shopify and Bubble.io integrations for dynamic e-commerce functionality ● Led frontend architecture using MUI and implemented advanced data handling with GraphQL ● Enhanced platform reliability with containerized infrastructure and multi-stage testing pipelines

Utopia Tech PTY LTD

May 2022 – May 2024

Senior Full Stack Engineer

● Architected and developed full-stack web apps using Remix, Svelte, Shadcn UI, and Spring Boot ● Delivered Web3 functionality through Solidity smart contracts and Rust-based modules ● Integrated Redis for caching and real-time notifications across multiple systems ● Led migration to serverless deployment with AWS Lambda and Vercel, improving scalability ● Optimized GraphQL schema and API performance, reducing client query latency by 45% ● Standardized CI/CD pipelines for staging/production using Docker and Ubuntu servers

FUWARI

Apr 2019 – Mar 2022

Tokyo, Japan

Frontend Developer

• Contributed to building a NFT marketplace. • Converted 14 UX/UI designs into live frontend pages using Next.js and Tailwind CSS. • Implemented a custom Cypress-based framework for end-to-end testing, with custom scripts, commands and integrations developed in Node.js, and upgraded it to Cypress 10. • Built the frontend of the NFT marketplace dashboard using React.js and MUI (Material UI). • Made the reusable components of repeated elements and animations to reduce the time of the frontend's development and improve its running speed.

Riverina

May 2018 – May 2020

Full Stack Developer

● Delivered customer-facing features using Vue.js, Nuxt.js, Tailwind CSS, and REST APIs ● Implemented backend functionality in Node.js, Express.js, and MongoDB ● Developed mobile-first solutions with Flutter and React Native for logistics and CRM platforms ● Introduced Docker-based development workflows, reducing local environment issues by 40% ● Built internal dashboards using Python and Django for real-time operational reporting ● Integrated GraphQL endpoints and improved API response times through efficient schema design

Hexaware Technologies

May 2017 – May 2018

Junior Full Stack Developer

● Contributed to internal business tools using Java, Spring Boot, PHP, and MySQL ● Assisted in developing and maintaining responsive UIs with Angular, JavaScript, and SCSS ● Supported RESTful API integration and testing for internal service layers ● Participated in Agile sprints and used Git and JIRA for source control and task tracking ● Collaborated with QA to identify and resolve UI/logic bugs in cross-functional environments ● Developed foundational skills in full-stack development and enterprise system architecture

Education

Nagoya University

Aug 2016 – Sep 2020

B.S. , Computer Science

Atsuo Koizumi

Senior Full Stack Engineer - Web3 & AI

Skills

Languages