Joseph is available for hire
Hire JosephJoseph Saw
Verified Expert in Engineering
Blockchain Developer
Kuala Lumpur Federal Territory of Kuala Lumpur, Malaysia
Toptal member since August 30, 2022
Bio
Joseph is an experienced full-stack developer who has worked on various projects, including crypto payment solutions and decentralized yield tokenization and trading. In his spare time, he occasionally works on arbitrage bots and most recently created YouTube videos to provide education on smart contracts and solidity.
Portfolio
Floki Web Solutions
Blockchain, Decentralized Finance (DeFi), Cryptocurrency, Solidity...
The People's Movement Corp.
Blockchain, Bots, Trading, Decentralized Finance (DeFi), Binance API...
Hex Trust
Crypto, DApps, Stablecoins, Blockchain, Ethereum...
Experience
Availability
Part-time
Preferred Environment
TypeScript, Vue, Solidity, Ethereum, Hardhat, Smart Contracts, ERC-20, Non-fungible Tokens (NFT), Cryptocurrency Wallets, Decentralized Finance (DeFi)
The most amazing...
...smart contract I've built secured and transacted $20 million of user funds.
Work Experience
Senior Solidity Developer (via Toptal)
2023 - 2024
Floki Web Solutions
- Spearheaded the implementation of robust security measures in token contracts, leading discussions and reviews with CertiK's audit team and contributing to the overall reliability of the tokenization platform.
- Engineered and deployed tokenization contracts, empowering users to create customized ERC20, ERC721, and ERC1155 tokens with unique features like buyback, reflection, burn, transfer fees, and a public mint fee.
- Advised and collaborated with clients to develop MEV-resistant trading and sniping bots, enhancing their ability to navigate and operate efficiently in dynamic blockchain environments.
Technologies: Blockchain, Decentralized Finance (DeFi), Cryptocurrency, Solidity, Smart Contract Development, Ethereum, Ethers.js, Etherscan, Ethereum Smart Contracts, Bitcoin, Binance API, Bots, ÐApp, BNB Smart Chain, Test Scripting, Foundry, Truffle
Blockchain Trading-bot Expert
2023 - 2023
The People's Movement Corp.
- Improved their existing bot algorithm to allow an unlimited number of token pairs to monitor without the need for an expiry time, giving better reliability and options to buy/sell a token.
- Debugged and fixed an issue with their bot sending multiple ERC-20 approval transactions.
- Onboarded by the client to help resolve several issues with their existing decentralized finance sniper trading bot.
Technologies: Blockchain, Bots, Trading, Decentralized Finance (DeFi), Binance API, Cryptocurrency, Amazon Web Services (AWS), APIs, ERC-20, Web3.js, Web3, ÐApp, BNB Smart Chain, Test Scripting, Foundry, Truffle
Product Manager Consultant
2022 - 2023
Hex Trust
- Researched methodologies to maintain the peg of USDX, ensuring stablecoin stability and reliability.
- Led the research, SOP development, and setup of monitoring and alerting software (OpenZeppelin Defender) to oversee on-chain activities of USDX, ensuring real-time response against potential hacks.
- Designed the Gas Station feature to automatically fund wallet addresses for transactions with insufficient gas, improving user experience and transaction efficiency.
- Managed a team of developers in building new features, ensuring timely delivery and alignment with company goals.
- Led the deprecation of Goerli, transitioning to Sepolia testnet for Ethereum, enhancing product demo reliability and functionality.
Technologies: Crypto, DApps, Stablecoins, Blockchain, Ethereum, Ethereum Virtual Machine (EVM), Decentralized Finance (DeFi), Cryptocurrency, Cryptocurrency Wallets
Senior Web3 Front-end and Solidity Developer
2022 - 2023
Pinjam Labs
- Designed and implemented a custom rebasing ERC20 token to show the accrual of yield for lenders and the accrual of debt for borrowers in real time.
- Built and implemented an accounts abstraction feature that allows a user with a single address to open multiple sub-accounts on a single address, saving gas costs from having a user manage numerous addresses.
- Developed core features such as lending, withdrawing, borrowing, repaying, and liquidating user assets using Solidity smart contracts.
- Researched proxy contracts and used EIP-2535 architecture, allowing for ease of composability and upgradeability of Solidity smart contract features.
- Conducted simple security audits and economic attacks using Hardhat, Mocha, and Chai.
- Built a custom decentralized web application using Vue, Ethers.js, Tailwind CSS, and Netlify. I integrated all the smart contract features into the UI, allowing users to view all market data and deposit and borrow assets directly on the blockchain.
Technologies: APIs, Vue, Smart Contract Development, Ethereum Smart Contracts, Solidity, Project Planning, Ethers.js, TypeScript, JavaScript, Ethereum, Netlify, Web3.js, Subgraph, Blockchain, Chai, Testing, Mocha, Git, Web, Hardhat, Crypto, Tokenomics, Cybersecurity, Cryptocurrency Wallets, Node.js, CSS, HTML, Blockchain Platforms, Blockchain Design, Decentralized Autonomous Organizations (DAO), Decentralized Finance (DeFi), Cryptocurrency, DApps, Cryptocurrency APIs, Web Development, Fintech, Cryptoeconomics, Tailwind CSS, MetaMask, Decentralization, Tokenization, TradingView, ERC-20, Web 3.0, Front-end, Web3, Front-end Development, ÐApp, BNB Smart Chain, Test Scripting, Foundry, Truffle
Blockchain Trading-bot Expert
2022 - 2022
The People's Movement Corp.
- Implemented a custom trading view indicator using Pine Script to send alerts to a Firebase back end once strategy parameters have been met. This will ping the trading bot to determine whether to execute the trade.
- Architected a composable data structure to allow for a custom number of price sources, dynamic take profit and stop losses, and price source weightages.
- Built an admin dashboard using Vue, TypeScript, and Firebase for ease of use for non-technical users, allowing the admin to manage positions and symbols to trade.
- Integrated Binance API to allow the bot access to a centralized exchange to execute trades on.
- Hosted the bot on Heroku for reliable uptime, logs, and pushing updates via their custom Heroku Git command line interface.
Technologies: Blockchain, Bots, Trading, Decentralized Finance (DeFi), Binance API, Cryptocurrency, Pine Script, Heroku, Arbitrage, Fintech, Cryptoeconomics, Cryptocurrency APIs, Firebase, Tokenization, TradingView, ERC-20, Front-end, Web3.js, Web3, ÐApp, BNB Smart Chain, Test Scripting, Foundry, Truffle
Blockchain Engineer
2020 - 2022
Pendle
- Developed a blockchain monitoring service using Subgraph and GraphQL to monitor the prices of yield, fluctuating interest rates, and user rewards, implementing a dashboard to display the data.
- Integrated all Solidity smart contract logic to the UI, allowing users to tokenize their yield into an ERC-20 token, trade it, and collect rewards. This was launched on Ethereum Mainnet with a total transaction volume of over $30 million.
- Designed SOPs for UI developers to deploy a local blockchain and Pendle protocol on their machines for development and testing.
- Implemented and deployed a UI using Vue, Tailwind CSS, Ethers, and Netlify.
- Built a landing page for the ICO of our ERC-20 token, seeing $10 million in total sales within the first hour of launching.
- Researched multiple blockchains to help the team decide on the second blockchain to deploy our smart contracts, expanding our protocol and going multi-chain.
Technologies: Ethereum, Ethers.js, Vue, Netlify, Web3.js, Subgraph, Git, Mocha, Testing, Chai, Hardhat, Ethereum Smart Contracts, Blockchain, Tokenomics, Crypto, Cybersecurity, Solidity, Smart Contract Development, APIs, Node.js, CSS, HTML, Blockchain Design, Blockchain Platforms, Decentralized Autonomous Organizations (DAO), ERC-721, Decentralized Finance (DeFi), Bots, Trading, Cryptocurrency, DApps, Web Development, Cryptocurrency APIs, TypeScript, Web, Cryptocurrency Wallets, Fintech, Cryptoeconomics, GraphQL, Tailwind CSS, MetaMask, Decentralization, Tokenization, TradingView, ERC-20, Front-end, Web3, Front-end Development, ÐApp, BNB Smart Chain, Test Scripting, Foundry, Truffle
Lead Developer
2019 - 2020
Sellcrowd
- Developed an MVP on WordPress within a month, resulting in the first 100 job posts.
- Rebuilt MVP to a standalone WebApp on Nuxt.js and Firebase back end within three months.
- Implemented functionalities from account creation, posting, and applying to jobs, live messaging, hiring, contract management, and payments and payouts using Stripe.
Technologies: Firebase, Vue, JavaScript, Serverless Architecture, Nuxt.js, Git, SendGrid, SendGrid API, WordPress, Cybersecurity, Team Leadership, Netlify, APIs, Node.js, React, CSS, HTML, Bots, Web Development, Web, Front-end, Front-end Development, Test Scripting
Full-stack Developer
2018 - 2019
ThunderQuote
- Developed a drag-and-drop dashboard to manage procurements for multiple levels of an organization, making it easy for large teams to understand where they're at in the procurement stage and simplify the approvals and review process.
- Refactored several sections of PHP code to follow the updated best practices set by the CTO. Resulting in more readable and efficient code.
- Created an email subscription service using a PHP back end and SendGrid integration, sending out thousands of emails monthly.
Technologies: jQuery, WordPress, Vue, Amazon Web Services (AWS), Git, SendGrid, SendGrid API, Cybersecurity, APIs, Node.js, React, CSS, HTML, Bots, Web Development, Web, Front-end, Front-end Development, Test Scripting
Experience
Triangular Arbitrage Bot
https://snowtrace.io/tx/0x5a1b5675719f55e586e39e28166cf3d86bf1c80c852a98be688468a239c66615A triangular arbitrage bot that monitors the blockchain for specific transactions that interact with decentralized exchanges.
Once found, it checks the trade volume to see if it will cause a significant enough price impact to create an arbitrage opportunity. If so, it will immediately calculate the best possible path for profit and submits the transaction.
Once found, it checks the trade volume to see if it will cause a significant enough price impact to create an arbitrage opportunity. If so, it will immediately calculate the best possible path for profit and submits the transaction.
GamePay
A crypto payment gateway solution for the online gaming industry. Planned and developed a scalable serverless back-end architecture to monitor various blockchains for transactions with minimal downtime.
Built a front-end dashboard for projects to manage and monitor relevant data like deposits, withdrawals, and user and historical data.
Built a front-end dashboard for projects to manage and monitor relevant data like deposits, withdrawals, and user and historical data.
Web VR
http://www.ijn.com.my/ijnprivate/virtual-tour/I was a sub-contractor for this project. I developed a WebVR environment for the National Heart Institute of Malaysia to showcase its hospital services and facilities.
Using 360-degree images provided by the primary contractor of the hospital, I stitched it together using Marzipano, then created the pop-up and enlightening experience using jQuery.
Using 360-degree images provided by the primary contractor of the hospital, I stitched it together using Marzipano, then created the pop-up and enlightening experience using jQuery.
Ethereum Units Converter
https://ethunitconverter.com/I frequently use online tools to help me to do big numbers of conversions when developing Smart Contracts.
Unfortunately, the existing tooling is very restrictive and does not support custom decimals, so I built my tool and released it to the Ethereum community.
Unfortunately, the existing tooling is very restrictive and does not support custom decimals, so I built my tool and released it to the Ethereum community.
Education
2015 - 2018
Bachelor of Security and Forensics in Computer Science
Taylor's University - Subang Jaya, Malaysia
Skills
Libraries/APIs
Vue, Web3.js, Chai, jQuery, Node.js, SendGrid API, React, Binance API, WebVR
Tools
Mocha, MetaMask, Git, SendGrid, Etherscan
Languages
Solidity, TypeScript, JavaScript, CSS, HTML, Pine Script, GraphQL
Frameworks
Hardhat, Truffle, Nuxt.js, Tailwind CSS
Paradigms
Testing, Serverless Architecture
Platforms
Ethereum, Netlify, Web, Blockchain Platforms, Blockchain, WordPress, Amazon Web Services (AWS), Heroku, Firebase
Industry Expertise
Cybersecurity
Other
English, Smart Contract Development, Ethers.js, Subgraph, Ethereum Smart Contracts, Non-fungible Tokens (NFT), Crypto, APIs, Blockchain Design, Decentralized Autonomous Organizations (DAO), ERC-721, Decentralized Finance (DeFi), Bots, Cryptocurrency, DApps, Cryptocurrency APIs, Web Development, Fintech, Cryptoeconomics, Decentralization, Tokenization, TradingView, ERC-20, Front-end, Web3, Front-end Development, ÐApp, BNB Smart Chain, Test Scripting, Project Planning, Tokenomics, Cryptocurrency Wallets, Team Leadership, Trading, Foundry, Arbitrage, Bitcoin, Web 3.0, Stablecoins, Ethereum Virtual Machine (EVM)
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