dltman

# Built a Radix Scrypto(Rust) StableCoin Vault blueprint(smart contract) for admin badge holders to mint/withdraw/deposit/burn/transfer tokens. Tested its functionalities with test scripts # Hired by Aqifi.com for building and deploying NFT Rust canisters(smart contracts) with UI canister(website) on Internet Computer blockchain # Built a Rust backend API server using AXUM framework, Postgres & SeaORM, JWT, middleware, and Ethers.rs to interact with Ethereum smart contracts # Built a Substrate node in Rust with multiple pallets for Staking, Reward Token, Ink smart contracts, interest rate calculation, crowdfunding, etc... # Built a SolidJS Twitter clone. Built a SvelteKit fullstack Dapp with TailwindCSS, Skeleton UI, to interact with Radix Scrypto and Ethereum blockchains, with Pocketbase database # Built Aave Flashloan and Liquidity client smart contracts, Uniswap client smart contracts in Solidity with Foundry testing environment to simulate Ethereum Mainnet operation # Updated my Solana Rust code with the latest Anchor tool: sending SOL/tokens to/from PDA # Built a fullstack Web3 NFT Sales Dapp with NFT carousel, NextJs(React), Shadcn UI, TailwindCss, TypeScript, Ethers.js, RainbowKit, Wagmi & Viem multiwallet connector, Tanstack Query(React Query) for server state management, Zustand for client state management, and MongoDB/Mongoose database models, deployed on Vercel

# Worked on DeFi Staking & Crowdfunding & Vesting Solidity smart contracts using the latest Openzeppelin, ether.js, TypeScript libraries. Converted Truffle environment to Hardhat. Fixed various testing code # Ported an Ethereum ICO + MultiSig vault project into a Solana Rust program(smart contract) via Anchor # Made TypeScript ReactJs frontend for Ethereum smart contracts and Solana programs with different web3.js libraries respectively # Worked on a Polkadot Substrate based Parachain with Cumulus(distribution, p2p, database, and synchronization layers) and Frontier(EVM compatibility) features # Fixed various upgrade and dependency problems. Integrated various Substrate pallets & pallet testing. # Tested the Substrate EVM with Hardhat & major upgradeable Solidity smart contracts, and with Zombienet testing environment; Also built the Parachain project into Docker images # Wrapped pallets into precompiles for Ethereum users to call Substrate functions

# Built a DeFi Binary Option Trade smart contract system on XDAI and Binance Smart Chain for users to make option trades, which are bets on Bitcoin or Ethereum price movement. Developed a timestamp to price data mapping using Chainlink’s price feed contracts. Users can also stake tokens to increase liquidity then get rewards in return. # Developed Golang APIs to read/write values from/to smart contracts in XDAI/BSC blockchains, set cron jobs, and scrape websites data # Developed JavaScript libraries on top of Web3.js/Ethers.js for users to interact with the smart contracts via web browsers # Modified AutoFarm and Harvest Finance smart contracts to a newer Solidity version and newer OpenZeppelin’s libraries. Also ported development environment from Truffle to Hardhat

# Built customer membership APIs in Golang microservice with JWT tokens authorization and AWS RDS MySQL Database, then tested with Postman runner(automated API flow tests), deployed them as Amazon AWS Lambda Functions # Accomplished APIs that include registering, login, sending SMS/Emails verification codes, updating account info, and requesting to renew password; Used parallel computing Goroutine and Channels to prevent program hang/timeout problem

# Developed a backend Golang server with an Ethereum certificate module for issuing cryptographically signed certificates, whose correct signing address can be verified in smart contracts. That signing addresses can be used as proofs of buy/sell authorization from Security Token Offerings(STO) issuers according to financial regulations. The certificates are part of the ConsenSys’ ERC1400 STO standard. # Improved organizational security via smart contracts for address based access control # Implemented a customer cryptocurrency cold storage(cold wallet) workflow and key encryption strategy via 3rd-party open source softwares. Also implemented its operation manual.

# Developed a new smart contract protocol by fusing ERC20, ERC223, and ERC721 token standards into a the Helium Standard. Used MochaJs to build automated logic flow testing scripts # Worked extensively with NodeJs backend server APIs and web3.js(Ethereum JavaScript API). For example: Async/Await Promise based functions, RESTful APIs, issuing tokens, authorizing certain users to send token transactions, automatically updating smart contract states according to a MySQL database, input error checking functions in both server side and smart contract side # Developed ReactJs Apps(Dapps) with React Hooks & Context API