I'm a Solidity developer focused on writing secure, well-tested smart contracts for DeFi and DApp projects. Currently deepening my skills in contract security, testing patterns, and DApp development.

• Smart Contracts — ERC-20 tokens, staking protocols, access-controlled systems
• Security-First Code — ReentrancyGuard, Checks-Effects-Interactions, OpenZeppelin standards
• DApps — On-chain logic connected to frontend interfaces

A smart contract bank with full security implementation.

What it does:

• Users deposit and withdraw ETH
• Owner-only bank balance visibility
• Protected against reentrancy attacks

Security used:

• ✅ ReentrancyGuard from OpenZeppelin
• ✅ Checks-Effects-Interactions pattern
• ✅ Ownable access control
• ✅ private balance mapping

Deployed & tested on Sepolia Testnet

A fully functional ERC-20 token deployed on Ethereum Sepolia Testnet.

What it does:

• Standard ERC-20 token compatible with MetaMask & all wallets
• Fixed supply of 1,000,000 KRK
• Owner-controlled minting

Built with:

• ✅ OpenZeppelin ERC-20 standard
• ✅ Ownable for admin control
• ✅ Live contract on Sepolia: 0xF95a8A5ba4eDf4356bC373f272b71F2AfB1bC8A4

Importable directly into MetaMask on Sepolia network

A secure DeFi staking protocol built with Solidity.

What it does:

• Users stake ETH and earn 10% reward
• 30-day lock period enforced on-chain
• Secure reward claiming system

Built with:

• ✅ Checks-Effects-Interactions security pattern
• ✅ Custom modifiers for access control
• ✅ Time-based lock period using block.timestamp
• ✅ Struct-based user data storage

Complete Foundry test suite for the StakingDapp contract.

8 tests — all passing ✅

• Happy path tests (stake, unstake, claim reward)
• Revert tests (zero amount, stake twice, unstake early)
• Time-based tests using vm.warp()
• Balance verification tests

Built with:

• ✅ Foundry framework
• ✅ Cheat codes: vm.prank, vm.warp, vm.deal, vm.expectRevert
• ✅ Test results documented in test-results.txt

• ERC-20 token standard ✅ done with Kareka Token!
• DeFi patterns: staking, rewards, time locks ✅ done with StakingDapp!
• Foundry testing framework ✅ done with StakingDapp-Tests!
• Hardhat — local testing & deployment
• ethers.js — connecting contracts to frontend
• ERC-721 NFT standard

• Remote Junior Smart Contract Developer roles
• Freelance Solidity work
• Bounty contributions (Gitcoin, Immunefi)
• Open source collaboration

📍 Based in Semarang, Indonesia — available globally, async-friendly

• GitHub: @Moebium
• Open to work: Yes

"Every line of code that holds real money must be written like someone is trying to break it."