About

Harsh Mittal

Full stack blockchain & AI developer

I build production systems across three areas that keep converging: blockchain protocols, AI systems, and financial infrastructure. Smart contracts and the interfaces on top of them, LLM agents and retrieval pipelines, market data infrastructure — usually the whole path from mechanism design to the screen someone actually uses.

I won ETHIndia 2024. I also worked as a developer on the team behind the Euclid Protocol cross-chain liquidity suite, contributing across its protocol site, swap, Planet, Launch and Scan surfaces. Day to day I work with US and international clients on DeFi, AI agents, healthcare, and trading infrastructure.

5+: Years building
ETHIndia 2024: Hackathon winner

Worked as a developer at Euclid Protocol. The scale below belongs to the product and the team that built it, not to me individually.

100K+: Users
2M+: Transactions
100K+: Passport mints

Work with me Engineering notes

What I work on

Domains with real delivered work behind them

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

Tools I reach for

Product & interface

TypeScript
Next.js
React
Tailwind
Framer Motion
Three.js

Onchain

Solidity
Ethers.js
Web3.js
Solana
Rust

Backend, data & AI

Node.js
Python
PostgreSQL
GraphQL
Claude API