Developed a Web3 issue marketplace platform integrating real-time collaboration, GitHub automation, and EVM-based escrow payments.
Key Responsibilities:
• Designed backend APIs using Node.js, Express, and MongoDB (MVC architecture) for authentication, issue management, applications, comments, notifications, and workspace handling.
• Implemented JWT-based role system (Client / Developer / Admin) with rate limiting, CORS control, and audit logging.
• Built real-time chat and notification system using Socket.io with issue-based collaboration rooms.
• Developed browser-based code workspace using Monaco Editor, supporting file management, Git operations, and PR automation via GitHub API (OAuth + Octokit).
• Designed and integrated Solidity escrow smart contract (Hardhat) with MetaMask and ethers.js for deposit, release, and refund flows.
• Containerized services using Docker with environment-based configuration.
Tech stack: Node.js, Express, MongoDB, React, Socket.io, Solidity, Hardhat

Developer

Developed a cross-chain binary options trading platform on Ethereum (EVM) and Aptos, supporting decentralized market creation, settlement, and oracle-based payouts.
Key Contributions:
• Built Solidity smart contracts for market factory, settlement, payout, and fee distribution; integrated Chainlink-style and Oreka oracle feeds for price resolution.
• Implemented Move smart contracts on Aptos replicating binary options logic using resource-oriented design and event-driven lifecycle management.
• Wrote deployment scripts and tests using Foundry (forge) and Hardhat; configured multi-network environments (Anvil, testnet, mainnet).
• Developed backend services (Node.js / NestJS + PostgreSQL) to manage off-chain metadata and synchronize on-chain events.
• Built React / Next.js DApps with wallet integration, dashboards, price charts, and transaction UX.
Tech stack: Solidity, Move, Foundry (forge), Hardhat, Node.js, NestJS, PostgreSQL, React, Next.js, ethers.js, Aptos SDK.

Khoi Nguyen Trong

Fullstack developer Intern

Fullstack developer Intern

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