Md Sabbir Hossain's Work | ContraWork by Md Sabbir Hossain
Md Sabbir Hossain

Md Sabbir Hossain

Full-Stack & Web3 Engineer | Fintech, RWA & SaaS

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Gazipur, Bangladesh

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Gazipur, Bangladesh

Cover image for Global Finance Token Global Finance Token
Global Finance Token Global Finance Token is a full-stack platform for discovering, trading, and managing tokenized real-world assets (RWAs). It combines a React trading terminal, an Express indexing and verification API, PostgreSQL persistence, and regulated EVM tokens settled through smart contracts.
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Cover image for Institutional Infrastructure for Real-World Asset
Institutional Infrastructure for Real-World Asset (RWA) Tokenization, Physical Verification, Segregated Swiss Custody, Proof of Reserves, and Bilateral Physical Redemption. ReserveChain is an enterprise-grade institutional platform designed to bridge high-specification, lab-certified physical industrial metals and real-world assets into institutional on-chain markets. By integrating independent ISO/IEC 17025 accredited laboratory assays, segregated bonded custody in Swiss freeports (Zurich & Geneva) under Swiss Code of Obligations Art. 472 bailment contracts, W3C Digital Asset Passports, and continuous Chainlink Proof of Reserves (PoR) oracles, ReserveChain ensures that every on-chain token is verifiable, bankruptcy-remote, and 1:1 redeemable for physical delivery on demand.
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Cover image for Research Project: RWA Claim Protocal:
Research Project: RWA Claim Protocal: Asynchronous Settlement & Liquidity Protocol Developed an asynchronous settlement and liquidity infrastructure for tokenized Real-World Assets (RWAs) bridging multi-day banking delays (T+1 to T+3) via an ERC-7540 asynchronous vault, a real-world state attestation middleware, and a peer-to-peer secondary claim marketplace using Solidity, TypeScript, Node.js, Express, EIP-712, and React. Skills/Keywords: Solidity · ERC-7540 · ERC-4626 · EIP-712 · Smart Contracts · OpenZeppelin · TypeScript · Node.js · Express · React · Vite · Hardhat · Foundry · Web3 · Ethers.js · Cryptographic Attestation · Fail-Closed Architecture Result: Architected a fail-closed protocol achieving a 99/100 certification, verified T+0 liquidity, zero premature minting across 135+ tests, and 481,690 lifecycle gas (~38% lower than ERC-721 wrappers).
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Cover image for SwaneX: Regulated Blockchain Investment Platform,
SwaneX: Regulated Blockchain Investment Platform, Saudi Arabia Developed a regulated Saudi investment platform enabling retail and institutional investors to fund real estate, tourism, and cultural projects through tokenized NFT certificates using React 19, Node.js, Express 5, PostgreSQL, and a private Hyperledger Besu blockchain network. Skills/Keywords: TypeScript · React 19 · Node.js · Express 5 · PostgreSQL · Drizzle ORM · Hyperledger Besu · Solidity · Smart Contracts · Web3 · BullMQ · Zod · Tailwind CSS · AWS Result: Architected a secure, compliant fintech platform featuring full KYC workflows, multi-sig governance, and automated AML flagging, achieving zero Severity-1 defects and formal sign-off for CMA sandbox approval.
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