GM, my name is

Muhammad Zain Khan

I write smart contracts that hold money — and keep it.

Blockchain engineer focused on Solidity, DeFi and Web3 security. I design, test, audit and gas-golf smart contracts across EVM chains and Aptos, then wire them into full-stack dApps.

Open to remote roles in Web3 security, DeFi & smart contract engineering

see my resume

MuhammadZain.solcompiling…

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

contract MuhammadZain is BlockchainEngineer {
  uint256 public nftCollectionsShipped = 21;
  uint256 public criticalVulnsFound = 0;
  string[] chains = ["ETH", "ARB", "AVAX", "APT"];

  /// @notice Idea in, audited bytecode out
  function hire(bytes32 idea) external returns (bool) {
    require(idea != bytes32(0), "GM: bring an idea");
    return _shipSecurely(idea);
  }
}

on-chain receipts

Every one of these got confirmed. No rollbacks.

tx 0x33df…dd3d✓ success

NFT collections deployed

tx 0xffd6…af25✓ success

NFTs migrated ETH → Aptos

tx 0x853f…219d✓ success

Solidity contracts reviewed

tx 0x5973…7cb5✓ success

critical vulns in audits

tx 0x2a12…d935✓ success

simultaneous txs handled

tx 0x9d47…22fd✓ success

$0K+

NFT sales driven

what i do

smart contracts & security

solidity

Foundry

hardhat

Slither

ethereum

rust

Designing production contracts: ERC20, ERC721, ERC1155, staking, vesting, multisig wallets and tournament logic
Auditing and reviewing Solidity with Slither, MythX and Foundry fuzz testing, with zero critical findings on audited code
Gas optimization, e.g. a queuing mechanism that cut execution costs by 15%
MEV-aware design: arbitrage, sandwich and flash-loan attack surfaces

DeFi & multi-chain

polygon

arbitrum

avalanche

aptos

TON

chainlink oracles

IPFS

pinata

DeFi primitives: staking, lending, yield farming, launchpads and token distribution
Multi-chain payment rails that cut deposit failures by 30%
Cross-chain migrations with signature verification (2,700+ NFTs moved ETH → Aptos)
Off-chain oracles & event listeners keeping real-time prices in sync

full-stack dApps

TypeScript

Nestjs

Nodejs

NextJS

Wagmi

ethersJs

MongoDB

Github Actions

End-to-end dApps: contracts, NestJS/Express APIs and React/Next.js frontends
Wallet flows with Wagmi, Viem, Reown/web3Modal and Ethers.js
API performance: batching & caching for 20% faster exchange-rate fetching across 150+ pairs
CI/CD for blockchain deployments with GitHub Actions

where i've worked

Blockchain Engineer @TEKHQS

Feb 2025 - Present

Coordinated mobile, frontend and backend teams to integrate blockchain features into the Komiti app end to end.
Designed multi-signature wallet contracts with backend APIs and frontend integration for secure on-chain user authentication.
Shipped a full-stack domain fractionalization platform (NFT minting, ERC20 swaps, leasing proposals) under tight deadlines.
Go-to blockchain resource across departments, speeding up testing and delivery of production dApps.