Smart Contract Development

HashEx offers professional smart contract development services with a team of experienced developers who write, test, and deploy secure smart contracts across multiple blockchain platforms. The service covers various contract standards and blockchain ecosystems, with expertise spanning over 8 years in blockchain security and development.

Development Capabilities

The team develops smart contracts in Solidity and Rust languages, working with the most well-known contract types including:

• Fungible token contracts (ERC-20)
• NFT contracts (ERC-721, ERC-1155)
• DAOs (Decentralized Autonomous Organizations)
• Farms and staking contracts
• Vesting contracts
• Custom DeFi protocols
• NFT marketplace smart contracts
• Custom blockchain platform development

Development is available across most popular blockchains including Ethereum, BSC, Solana, Avalanche, Polygon, and 20+ other chains.

Development Process

After initial consultation, HashEx develops a vision of the contract requirements including type, language, goals, and specific details. The team then develops the contract with comprehensive testing to achieve 100% code coverage using Hardhat with ethers.js, waffle, and mocha. The development includes:

• Unit tests and automated testing scripts
• Manual testing by experienced developers
• Fuzzing tests using Echidna (when required)
• Mainnet fork testing for real network data validation

Beyond Smart Contracts

In addition to smart contracts, HashEx develops complete dApp solutions including smart contracts, front-end, and back-end components. This comprehensive approach ensures all aspects of decentralized applications are professionally developed and thoroughly tested. The team can also develop custom blockchain networks, layer 2 solutions, sidechains, consensus mechanisms, and blockchain infrastructure tailored to specific business requirements.

NFT Marketplace Development

HashEx provides complete NFT marketplace development services with expert developers who create fully functional platforms for NFT trading. Development includes:

• NFT minting functionality
• Marketplace listing and discovery systems
• Bidding and auction mechanisms
• Wallet integration
• Royalty management and metadata handling
• Comprehensive security measures

The team's expertise in blockchain security ensures NFT marketplaces are protected against common vulnerabilities including reentrancy attacks, price manipulation, unauthorized access, and metadata tampering.

Quality Assurance

Every developed contract undergoes rigorous testing with the goal of achieving 100% test coverage. The team employs specialized automated testing scripts and manual testing by experienced developers. For contracts requiring additional validation, HashEx provides fuzzing services and real network testing using mainnet forks.