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Takeda Yoichi

@takedayoichi

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Senior blockchain and full-stack developer building secure dApps, NFTs, and scalable smart contracts.

Japan

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What I'm looking for

I’m looking to build secure Web3 dApps—smart contracts, NFTs, and DeFi—where I can own backend architecture, collaborate with auditors, and ship production-ready code in fast-paced teams.

I’m a Senior Blockchain & Full-Stack Developer with 10+ years of experience designing and deploying production-ready Web3 systems. I’ve built and shipped scalable dApps, NFT platforms, and secure smart contracts across major ecosystems.

In my most recent role, I developed and deployed smart contracts using Solidity, Rust, and Haskell across Ethereum, BSC, and Solana. I led backend systems for NFT and DeFi applications with Python and Node.js, integrated wallet support (Metamask, WalletConnect), and worked directly with auditors to ensure secure deployments.

Earlier, I built ERC20/ERC721 tokens and NFT marketplaces, implemented DeFi functionality like swaps and staking, and used Bitcoin multi-signature and custom encryption logic for dApps. I also bring strong front-end and full-stack depth—React/Next.js and modern back-end frameworks—so I can deliver cohesive end-to-end product experiences.

Experience

Work history, roles, and key accomplishments

Senior Smart Contract Developer

OMG Company

Apr 2022 - Apr 2024 (2 years)

Developed and deployed smart contracts using Solidity, Rust, and Haskell across Ethereum, BSC, and Solana ecosystems. Led backend services for NFT and DeFi applications, integrated wallet support, and partnered with auditors to ensure secure deployments.

Solidity Rust Haskell Smart Contracts NFT DeFi Backend Python Node.Js NodeJS PostgreSQL MetaMask WalletConnect

Blockchain Engineer

Infinite Uptime

Sep 2019 - Mar 2022 (2 years 6 months)

Built and deployed ERC20/ERC721 tokens and NFT marketplaces using React, Web3, and Solidity. Implemented DeFi smart contract functionality for swaps and staking, worked with Bitcoin multisig and encryption, and forked Uniswap/Bancor for custom trading features.

React Web3.js Solidity ERC20 ERC721 DeFi Swaps Staking Bitcoin Multisig Uniswap Bancor Forking

Smart Contract Developer

MEZURASHICO

Oct 2017 - Feb 2019 (1 year 4 months)

Created Solidity smart contracts for trading applications and token launches, integrating Metamask for wallet-based onboarding. Built backend infrastructure with Node.js and MongoDB and collaborated with frontend teams to connect smart contract functionality.

NodeJS Solidity Smart Contracts MetaMask Node.Js MongoDB Token Launching Backend Infrastructure

Front-End Engineer

Nowsite

May 2015 - Jun 2017 (2 years 1 month)

Built user interfaces for NFT marketplace and blockchain dashboards using React Native, TypeScript, and Tailwind CSS. Delivered high-performance, mobile-responsive web apps with pixel-perfect UI implementation.

TailwindCSS React Native TypeScript Tailwind CSS UI Development Web Performance JavaScript

Full-Stack Developer

FIXER

May 2011 - Aug 2014 (3 years 3 months)

Developed full-stack systems using React, Vue, Angular, and backend frameworks including Django and Laravel. Automated data pipelines with Python and JavaScript and integrated IPFS/COBAL with enterprise databases such as Oracle, Teradata, and MongoDB.