Hi There, I'm

Saito Yasuhiro.

AI/FullStack Developer

Fullstack developer with 7 years of experience, including 4+ years in Web3 and AI/automation projects. Experienced in building smart contracts, dApps, and internal workflow systems. Comfortable designing end-to-end solutions connecting frontend, backend, APIs and automation pipelines.

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About

About Me

Fullstack developer with 7 years of experience, including 4+ years in Web3 and AI/automation projects. I specialize in building end-to-end solutions that connect frontend, backend, APIs, and automation pipelines. My expertise spans blockchain development (smart contracts, dApps, ERC-20, ERC-721), full-stack web applications using React, TypeScript, Node.js, and Python, and internal systems for data processing and automation workflows. I've designed and maintained internal systems at SmartHR, built React/Vue.js frontends and Node.js/Express APIs at SmartNews, and currently work on blockchain projects as a freelancer. My focus is on creating scalable, production-ready solutions that streamline workflows and drive business value.

Tech Stack

React Next.js Vue.js TypeScript Tailwind CSS Node.js Go Python PostgreSQL MySQL MongoDB Solidity Hardhat OpenZeppelin Ethers.js AWS Vercel Docker CI/CD GitHub Actions Terraform Express REST APIs Automation Pipelines

Services

My Services

Full-Stack Development

Build end-to-end web applications using React, Next.js, Vue.js, TypeScript, Node.js, and Go. Design scalable frontends and robust backend APIs with PostgreSQL, MySQL, and MongoDB.

Blockchain & Web3 Development

Develop smart contracts (ERC-20, ERC-721), dApps, and NFT projects using Solidity, Hardhat, OpenZeppelin, and Ethers.js. Experience with Ethereum, Polygon, and BSC.

AI & Automation Workflows

Design and maintain internal systems for data processing and automation workflows. Build automation pipelines handling structured data, routing, and processing tasks across systems.

Dashboard & Admin Tools

Create internal dashboards and admin tools using React, Vue.js, and TypeScript. Integrate with backend APIs and databases for real-time data visualization and management.

Cloud & DevOps

Deploy and manage applications on AWS and Vercel. Set up CI/CD pipelines with GitHub Actions, containerize with Docker, and manage infrastructure as code with Terraform.

API Integration & Data Processing

Integrate internal tools and external APIs to streamline content and workflow pipelines. Handle structured data processing, routing, and system integrations.

Experience

My Experience

  • 01/2025 – Present
    Freelancer, Blockchain Developer

    Worked on selected blockchain projects including smart contracts (ERC-20, ERC-721) and dApps, bots, NFT projects. Built and maintained React/TypeScript frontends and Node.js/Python backends for a few clients. Focused on maintenance and incremental development rather than large scale projects.

    - Nagoya, Japan
  • 04/2020 – 12/2024
    SmartHR, Inc - AI / Full-Stack Developer

    Designed and maintained internal systems for data processing and automation workflows. Built dashboards and backend endpoints using React, TypeScript, Node.js and Go. Integrated internal tools and external APIs to streamline content and workflow pipelines. Contributed to system stability with bug fixes, performance tuning and feature updates. Owned development of internal automation pipelines, handling structured data, routing and processing tasks across systems.

    - Tokyo, Japan
  • 04/2018 – 02/2020
    SmartNews, Inc - Full-Stack Developer

    Developed React/Vue.js frontends for internal dashboards and admin tools. Built Node.js/Express APIs with PostgreSQL/MySQL integration. Managed CI/CD pipelines and high availability deployments.

    - Tokyo, Japan
Education

Education

  • 04/2014 – 03/2018
    Bachelor's in Informatics

    Nagoya University

    - Nagoya, Japan
portfolio

My Portfolio

Deep Channel

Develop and Optimized custom Data Pipeline

Python Prefect Redshift Snowflake AWS Docker SharePoint MySQL ThoughtSpot
I implemented robust error handling and data validation to ensure consistent data quality, reduced deployment time by implementing CI/CD with AWS CodeBuild, optimized transformation logic for handling large volumes of diverse data, successfully connected multiple data sources into a unified warehouse, and structured the data specifically for optimal performance with ThoughtSpot.

CYFOX Cybersecurity

Develop and Optimized custom Data Pipeline

React Electron Node.js SQLite Windows Desktop Application Multiple API integrations (EDR, XDR, SOCaaS) SharePoint MySQL ThoughtSpot
Designed and implemented a secure, high-performance Electron-based desktop application for real-time security monitoring by integrating multiple cybersecurity APIs (EDR, XDR, SOCaaS) into a unified system with standardized data processing, while ensuring process isolation and minimal latency through an efficient AI-powered event pipeline.

RIOS Intelligent Machines

RPA Machine Learning AI, Edge Computing

Metaflow Roboflow MLFlow YOLO-based models FiftyOne Encord Kubernetes Docker Custom frame handling AWS S3 MongoDB
Developed a production-grade MLOps pipeline for video processing at RIOS, integrating dataset management and annotation platforms (Voxel51, Encord), extending FiftyOne with custom robotics plugins, and designing scalable, reproducible ML workflows with Kubernetes support.

Unstructured IO

ETL for LLMs

YOLOX YOLO-NAS DocLayNet layoutparser detectron2 PyTorch pandas numpy pdfminer pdf2image pikepdf Tesseract-OCR PaddleOCR Pydantic AI LangChain OpenCV NLTK
Resolved critical technical challenges including memory optimization for large PDFs, accurate document element extraction, robust Unicode handling across formats, and overall code quality improvement by fixing 300+ bugs and reviewing 500+ GitHub PRs.

AI Image Insight Explorer
Gemini AI Image Recognition Streamlit for web application Python AI and Image Processing PyCharm IDE Streamlit Data Security
Ask The Image Gemini Pro Vision App is a breakthrough mobile application that utilizes AI to analyze and provide image insights. It offers object identification, text recognition, and scene interpretation functionalities. Users can snap a photo and receive instant, detailed information about elements within the image, making it a versatile tool for education, research, and everyday life.

Plus One Company

NLP-Powered Call Analysis Platform

Python spaCy scikit-learn BERT Keras TensorFlow Topicrank Textrank Yake Autophrase Google Cloud Google Data Studio ELI5 LIME
Engineered a cloud-native NLP system on GCP that combines unsupervised keyphrase extraction, BERT-powered call segmentation, and sentiment analysis to derive actionable insights from thousands of unstructured voice conversations—leveraging custom preprocessing, ensemble techniques, and automated retraining pipelines for continuous performance improvement across sales and support processes.
Contact

Contact Me

Email

saitoyasuhiro0103@gmail.com

Location

Nagoya, Japan

Contact

Discord: bug_hunter70916

Charwork: Naruto0103

Telegram: @Astro70916

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