- 🔐 Solidity developer & Web3 backend engineer — building smart contracts, DAO governance systems, ERC‑20/ERC‑721 apps, DeFi protocols, and wallet/presale DApps
- 🧱 Full-stack across the Web3 pipeline: Foundry / Hardhat for contracts, Ethers.js / Web3.js for integration, FastAPI / Fastify for backend services
- 🧪 Test everything before it ships — fuzz testing, invariant testing, fork testing, no exceptions
- 🎯 Building a track record toward becoming a professional smart contract auditor — starting with CodeHawks First Flights, with Sherlock and Immunefi as the next milestones
- 💼 Freelance Solidity/Web3 developer on Upwork — shipped a token presale DApp and a multi-chain (ERC‑20/BEP‑20) browser wallet
- 📚 Currently exploring Move, and mapping EVM concepts onto Solana / Anchor
- 📫 Reach me at shimulsharma12345@gmail.com
Languages
Smart Contracts & Standards
Blockchain & Integrations
Frontend
Backend & Data
Security & Testing
DevOps
🎓 PROVORAFull-stack decentralized exam integrity platform — passwordless DID login, Ed25519-signed W3C Verifiable Credentials, a hash-chained Merkle transparency log, and a Go/WebSocket/Redis realtime service for live behavioral event streaming.
| USD-pegged overcollateralized stablecoin backed by WETH/WBTC with liquidation incentives and health-factor checks. Chainlink price feeds with stale-oracle protection. Handler-based invariant tests — 128,000 randomized calls, 0 reverts.
|
On-chain raffle using Chainlink Automation for scheduled upkeep and Chainlink VRF v2.5 for tamper-proof winner selection, with a custom VRF mock for local Anvil testing and CI/CD to Sepolia with Etherscan verification.
| Foundry-based ERC-721 contracts supporting both IPFS-hosted metadata and fully on-chain SVG NFTs, with Base64 metadata encoding, gas snapshots, and unit/fork testing.
|
On-chain governance built with OpenZeppelin Governor, ERC20Votes, ERC20Permit, and TimelockController — full proposal → vote → queue → execute lifecycle, with stateful invariant/fuzz tests covering ownership, roles, and execution rules.
| Solidity audit reports covering access control issues, on-chain data exposure, reentrancy/state manipulation risks, logic errors, gas optimizations, and mitigation recommendations.
|
Freelance Solidity & Web3 Developer · Upwork (Remote)
- Engineered an ERC-20 token presale DApp (Solidity + Vite/React) with MetaMask/WalletConnect and real-time presale tracking
- Built a multi-chain DApp browser wallet (Ethereum ERC-20 + BSC BEP-20) with encrypted private-key management via CryptoJS