Service details
Blockchain & Web3 Development
We design and build decentralized applications, smart contracts, and Web3 infrastructure for startups and enterprises entering the blockchain space. From protocol design to frontend DApp integration, we own the full stack.
Our team brings deep expertise in EVM-compatible chains, Solana, and Layer 2 networks — ensuring your product is secure, gas-efficient, and ready to scale.
What’s included
- Smart contract design, development & auditing
- DeFi protocol engineering (AMMs, lending, staking)
- NFT platforms and token contracts (ERC-20, ERC-721, ERC-1155)
- Web3 frontend integration (wagmi, ethers.js, viem)
- Wallet connectivity and transaction UX
- Testnet & mainnet deployment

Use cases
- Launch a DeFi yield farming or liquidity protocol
- Build an NFT marketplace with on-chain royalties
- Create a DAO governance system with token-weighted voting
- Develop a cross-chain bridge or token migration tool
- Integrate crypto payments into an existing e-commerce platform

Tech stack
- Solidity, Vyper, Rust (Solana/Anchor)
- Hardhat, Foundry, Truffle
- ethers.js, viem, wagmi
- OpenZeppelin, Chainlink
- Ethereum, Polygon, Arbitrum, Base, Solana
What our clients say
“Crossline delivered our DeFi protocol on time and with exceptional security standards.”
“The smart contract architecture Crossline built for us passed a full third-party audit with zero critical findings. World-class team.”
Marcus Webb
Founder at ChainVault
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