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Hire Harsh Mittal — Full Stack Blockchain & AI Developer

I'm Harsh Mittal, a full stack blockchain and AI developer with 5+ years of professional experience. I was a winner at ETHIndia 2024. I also worked as a developer on the Euclid Protocol team, a cross-chain liquidity suite. The product is team-built and its scale belongs to Euclid — 100K+ users, 100K+ Passport NFT mints, and 2M+ transactions — not to me individually. I work with US and international clients on DeFi, AI agents, healthcare, and financial infrastructure. Available for contract, consulting, and freelance engagements — remote, working with clients globally.

Start a conversationHire on Upwork ↗

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.

Euclid surfaces contributed to: Euclid Protocol, EuclidSwap, Planet Euclid, Euclid Launch, Euclid Scan.

Domains I work in

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.

What I can be hired for

  • 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

Stack

Primary

  • TypeScript
  • Next.js
  • React
  • Solidity
  • Foundry
  • Node.js
  • Python
  • Postgres
  • Viem
  • Ethers
  • Three.js
  • Claude API

Working knowledge

  • Rust
  • Solana
  • GraphQL
  • Hardhat
  • Wagmi

How I work

I write up how I build things — architecture decisions, failure modes, and the details that only show up in production. If you want to judge the engineering before talking to me, start there.

Engineering notesShipped projects