Supachai Rakthong

Focused on applying technical expertise in Smart Contract and blockchain development to build secure, efficient, and scalable systems. Committed to collaborating with cross-functional teams to create impactful DeFi, GameFi, and Web3 solutions that deliver real user value. Eager to continuously learn and grow as a professional in blockchain technology.

GoGoCashOct 2025 – Nov 2025Smart Contract Developer (Freelance)

• Developed Smart Contracts for a multi-chain Cashback withdrawal system.
• Implemented EIP-712–based authorization to support admin-approved Cashback withdrawals with replay protection.
• Enabled stablecoin withdrawals across multiple networks, including Polygon, BNB Chain, and Sonic.
• Built a reward point system and token airdrop logic to increase user engagement.
• Designed the admin approval workflow and optimized gas usage using OpenZeppelin standards.
• Collaborated with frontend and backend teams to ensure seamless integration of Smart Contracts with core application systems.

• Built and maintained Launchpad Smart Contracts for token deployment and crowdfunding.
• Integrated NFT systems to enhance project utility and engagement.
• Developed a real-time monitoring dashboard using Next.js, integrating on-chain data from smart contracts to visualize transactions, token metrics, and project performance.
• Improved security, scalability, and performance of blockchain components.
• Collaborated with frontend and backend engineers to ensure full Web3 compatibility.

• Developed and maintained DeFi investment systems including IDO, Public Sale, Private Sale, and Token Vesting contracts.
• Designed staking and marketplace systems to increase yield and optimize transaction efficiency.
• Conducted audits and gas optimization to enhance security and cost efficiency.
• Worked with UI/UX and backend teams to deliver a smooth Web3 user experience.

• Designed and developed Smart Contracts for the GameFi platform, including tokenomics, NFTs, and Play-to-Earn mechanics.
• Built and maintained ERC-20, ERC-721, and ERC-1155 token standards.
• Implemented reward systems, staking mechanisms, and NFT marketplaces.
• Tested and optimized smart contracts to enhance performance and security.
• Collaborated closely with frontend and backend teams to ensure seamless system integration.

Kasetsart University, ThailandGraduated 2021Bachelor of Engineering in Computer Engineering

• Faculty of Science and Engineering