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Winston Siu

@winstonsiu

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Senior Full Stack Developer with 7 years of experience in web3 technologies.

Malaysia

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What I'm looking for

Seeking opportunities to leverage my expertise in blockchain and web3 technologies, focusing on innovative problem-solving and contributing to cutting-edge projects in the decentralized space.

Senior Software Engineer with 7+ years of experience, including the past 5 years focused on Web3. I’ve worked across DeFi, DEX, DAO, and NFT projects—building smart contracts and full-stack applications that power decentralized systems used in the real world. From launching wallets used by over 600K users to helping secure protocols through partnerships with MetaMask, Coinbase, and Google Cloud, I’ve been hands-on across the blockchain stack.

My core skills include Solidity, Rust, TypeScript, and JavaScript, and I work with tools like React, Next.js, Node.js, NestJS, and Wagmi. I’ve held senior roles at startups like XDEFI, AthleteFi, and Toros Finance, where I’ve built everything from DEX aggregators to custom SDKs and on-chain analytics. I’m passionate about building secure, scalable, and impactful Web3 tools, and I’m always exploring what’s next in blockchain tech.

Experience

Work history, roles, and key accomplishments

Current

Senior Web3 Founding Engineer

Current

AthleteFi

Apr 2025 - Present (2 months)

- Designed and developed Dex-Aggregator to boost the usage of protocol tokens.
- Built a responsive, pixel-perfect front-end application using Next.js, ensuring a seamless and intuitive user experience.
- Integrated Wagmi.js and Viem.js for secure wallet connections and real-time interaction with on-chain smart contracts.

TailwindCSS AI ML Solidity Rust Web3.js React Next.js TypeScript JavaScript Docker

Senior Full Stack Blockchain Engineer

Toros Finance

Dec 2023 - Mar 2025 (1 year 3 months)

Created and maintained admin panel pages regarding identifying on-chain vulnerabilities related to exploit addresses on Ethereum and Polygon.
Developed basic SDK functions and packages using JS and TS and published to NPM
Designed and developed backend sides with Nest.js/TypeScript.

Rust EthersJS NodeJS Backend Frontend NestJS Problem Solving TypeScript Solidity Web3 React Next.js Git Curve

Smart Contract Developer

VVS Finance

Jan 2022 - Nov 2023 (1 year 10 months)

Developed cross-chain support for token contracts and core minting logic. Contributed to frontend dApp development and deployed contracts to Avalanche and Cronos.

Solidity Truffle Hardhat dApps Avalanche Cronos Next.js TypeScript

Wallet Founding Engineer

XDEFI (EX-CTRL)

Apr 2020 - Dec 2021 (1 year 8 months)

Built the infrastructure of XDEFI wallet, being used by more than 600K users on the chrome store.
Developed the chrome extension wallet similar to Metamask using React.
Integrated asgardex-binance/ethereum/bitcoin(ThorChain) and BEPSwap.
Understood Metamask and other crypto wallets open sources and inspired from mto build expandable project structure

Smart Contract & Web Developer

Crypto App Factory

Jun 2017 - Mar 2020 (2 years 9 months)

Developed an experimental stablecoin backed by liquidity pool tokens and utilized Chainlink Oracle feeds for valuation. Launched a DApp on the EVM mainnet using React.js and Web3.js.

Solidity React Web3.js JavaScript TypeScript Chainlink Oracle

Education

Degrees, certifications, and relevant coursework

Asia Pacific University of Technology & Innovation

Bachelor of Science, Computer Science

2013 - 2017

Grade: 3.5

Completed a Bachelor of Science in Computer Science with a GPA of 3.5. The program covered various aspects of computer science, including programming, software development, and systems analysis, preparing me for a career in technology and software engineering.