ziaullah

Shipped 20+ production dApps and smart contracts on Ethereum, Polygon, and BSC for NFT and DeFi projects. Built high-concurrency NFT launchpads handling 1,500+ mints in 10 minutes using Merkle proofs, Chainlink VRF v2, and batch processing. Designed gas-optimized tokenomics: soft staking, dynamic tax systems, anti-bot mechanics, auto-rewards, and whitelist phases — reduced average user gas costs by 40%. Integrated Crossmint & Moonpay fiat on-ramps and WalletConnect v2, dramatically improving conversion for non-crypto users. Enforced security best practices (OpenZeppelin, reentrancy guards, upgradeable proxies, emergency pauses) — all launched contracts remain exploit-free.

Wrote and audited 15+ DeFi smart contracts (staking, yield, lending) in Solidity 0.8.x with 100% test coverage using Hardhat. Optimized storage layout — cut deployment + runtime gas by 30–35% on average. Actively participated in code reviews and helped establish internal security checklist.

Built a complete NFT marketplace from scratch (Solidity backend + React/Ethers.js frontend + IPFS). Implemented lazy minting (EIP-712), signature verification, and WalletConnect — reduced minting gas by over 60%.