Hi, I am Harsh
I'm a full-stack web3 developer. Explore the multiverse of my work.
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Harsh Mittal — Full Stack Blockchain & AI Developer
Harsh Mittal is a full stack blockchain and AI developer with 5+ years of professional experience, building across Web3, AI systems, and financial infrastructure. ETHIndia 2024 winner. Worked as a developer on the team behind the Euclid Protocol cross-chain liquidity suite. Works with US and international clients through Upwork and direct contracts.
Available for contract, consulting, and freelance engagements — remote, working with clients globally.
Proof of work
- ETHIndia 2024 winner — Winner at ETHIndia 2024, the largest Ethereum hackathon in the world.
- Developer on the Euclid Protocol team — Contributed as a developer across the full Euclid Protocol suite — the protocol site, swap interface, Planet, Launch, and Scan. The product is team-built; its scale (100K+ users, 100K+ Passport NFT mints, 2M+ transactions) belongs to Euclid and the team, not to any one engineer.
- Shipped on Chrome Web Store and Firefox Add-ons — 8Dfy, a real-time spatial audio extension built on the Web Audio API with HRTF positioning, published and live on both stores.
- US clients via Upwork — Ongoing contract work with US-based and international clients.
Services
- Smart contract development and pre-audit security review
- DeFi protocol design and mechanism engineering
- AI agents, tool-calling systems, and production RAG pipelines
- Market data infrastructure and trading system backends
- Full stack product delivery with Next.js and TypeScript
- Web3 dApp architecture and cross-chain integration
Domains
- DeFi & Finance — Lending protocols, cross-chain liquidity, tokenized vaults, market data pipelines, and backtesting systems. Active crypto trader, so the domain knowledge is first-hand rather than borrowed.
- AI Agents & LLM Systems — Production RAG pipelines, tool-calling agent architectures, document extraction from financial filings, and on-chain agents with policy engines and scoped signing.
- Web3 & Smart Contracts — Solidity with Foundry and Hardhat, EVM protocol design, ERC-4626 vaults, oracle integration, and security review ahead of audit.
- Healthcare — Delivered production web applications for healthcare and research clients.
Stack
TypeScript, Next.js, React, Solidity, Foundry, Node.js, Python, Postgres, Viem, Ethers, Three.js, Claude API. Working knowledge: Rust, Solana, GraphQL, Hardhat, Wagmi.