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Tadashi Sato

@tadashisato

Message

Senior full-stack blockchain engineer specializing in secure Solidity and Rust smart contracts.

Japan

Message

What I'm looking for

I’m looking to build secure, production-grade smart contracts and deliver smooth dApp experiences—where smart contract lifecycle ownership, gas/performance optimization, and strong frontend integration (Ethers.js/Web3.js) are valued.

I’m a senior full-stack blockchain engineer with over 6 years of experience building smart contracts and integrating frontend experiences. My focus is “production-grade” delivery—Solidity and Rust—backed by rigorous testing and security-first development.

At Saola Labs, I led the architecture, development, and review of 5 production-grade Solidity smart contracts powering core on-chain features. This work increased on-chain feature efficiency by 30%, and I engineered scalable Rust-Anchor based smart contracts on Solana, reducing transaction failures by 20%. I owned the full lifecycle from design and internal auditing to Foundry testing and deployments across testnet and Mainnet database environments.

I also act as a bridge between smart contracts and user experience—coordinating frontend developers to integrate React-based dApps using Ethers.js and Web3.js, improving transaction reliability and UX performance by ~15%. Through gas optimization plus systematic unit and fuzz testing, I identified and resolved over 10 vulnerabilities and logic issues before release, and I’m energized by teams that value security, performance, and clean engineering collaboration.

Experience

Work history, roles, and key accomplishments

Smart Contract Lead Developer

Saola Labs

Jul 2024 - Nov 2025 (1 year 4 months)

Led architecture, development, and review of 5 production-grade Solidity smart contracts for core on-chain crypto/NFT analytics, improving on-chain feature efficiency by 30%. Coordinated React dApp integration using Ethers.js/Web3.js, increasing transaction reliability and UX performance by ~15%, and resolved 10+ vulnerabilities via Foundry testing, audits, and gas optimization.

Solidity Rust Foundry Hardhat Web3.js React Smart Contract Auditing PostgreSQL

Solana Developer & Frontend

Red Duck

Mar 2023 - Apr 2024 (1 year 1 month)

Engineered and deployed Rust-based smart contracts on Solana, enabling secure, scalable on-chain logic for digital asset workflows and dApps. Reduced transaction failures by 20% through optimized NFT minting and account validation, and integrated Phantom Wallet with real-time asset distribution and transaction tracking.

Solana Rust Anchor Minting Phantom Wallet Performance Optimization

Blockchain & Full-Stack Developer

Kenko Connect

Sep 2020 - Jun 2022 (1 year 9 months)

Assisted development of Solidity smart contracts and supported unit testing and basic gas optimization using Hardhat to keep deployments efficient. Collaborated with senior engineers to integrate smart contracts with React frontends via Web3.js/Ethers.js as part of the decentralized application SDLC.

Solidity Hardhat Unit Testing Web3.js React SDLC