$20,000.00 Fixed
Hiring blockchain developer for Ethereum smart contracts and DApp. Solidity, Web3.js, React expertise required. DeFi experience preferred. $60-$120/hour.
Description:
We're looking for an experienced Blockchain Developer to design and develop secure smart contracts and a decentralized application (DApp) on the Ethereum blockchain. Security and gas optimization are top priorities.
Project Overview:
Build a DeFi platform with smart contracts for token creation, staking mechanisms, and liquidity pools. The DApp should include a user-friendly web interface for wallet connection and transaction management.
Key Responsibilities:
Design and develop smart contracts using Solidity
Write comprehensive unit tests and security audits
Optimize gas costs and contract efficiency
Deploy contracts to testnet and mainnet
Build frontend DApp using React and Web3.js/Ethers.js
Implement wallet integration (MetaMask, WalletConnect)
Create blockchain event listeners and transaction handlers
Develop admin dashboard for contract management
Document contract architecture and functions
Conduct security audits and implement best practices
Required Skills:
2+ years of blockchain development experience
Expert-level Solidity programming (0.8.x)
Strong understanding of Ethereum, EVM, and blockchain fundamentals
Experience with smart contract development frameworks (Hardhat, Truffle, Foundry)
Proficiency in Web3.js or Ethers.js libraries
Frontend development with React.js
Knowledge of DeFi protocols and tokenomics
Experience with IPFS and decentralized storage
Smart contract security best practices and common vulnerabilities
Testing frameworks (Chai, Mocha, Waffle)
Technical Stack:
Blockchain: Ethereum (Layer 1) or Polygon (Layer 2)
Smart Contracts: Solidity 0.8+
Development: Hardhat or Foundry
Frontend: React.js, TypeScript, Web3.js/Ethers.js
Wallet Integration: MetaMask, WalletConnect
Testing: Hardhat Test, Chai
Storage: IPFS for decentralized file storage
Node Provider: Alchemy or Infura
Smart Contract Features:
ERC-20 token creation and management
Staking and reward distribution mechanisms
Liquidity pool and AMM functionality
Access control and role-based permissions
Emergency pause and upgrade mechanisms
Time-locked transactions
Multi-signature wallet integration
Security Requirements:
Reentrancy attack prevention
Integer overflow/underflow protection
Gas optimization techniques
Access control implementation
Event logging for all critical functions
Third-party security audit preparation
Deliverables:
Fully tested and audited smart contracts
Deployed contracts on testnet and mainnet
Complete DApp with wallet integration
Comprehensive test suite (90%+ coverage)
Smart contract documentation and ABI
Frontend application source code
Deployment scripts and instructions
Security audit report
User guide and technical documentation
Budget: $60 - $120/hour (Hourly) or $10,000 - $20,000 (Fixed project)
Timeline: 8-12 weeks
- Proposal: 0
- Less than 3 month
