Web3 & Smart Contract Development
Production blockchain applications backed by real mainnet deployments — Solidity smart contracts, DeFi protocol integrations, NFT platforms, and Web3-connected frontends built to production standards.
Blockchain Engineering With Production Experience
Web3 development demands a different discipline from conventional software engineering. Smart contracts are immutable once deployed — bugs become permanent, and on a high-value contract, the cost of an exploit can be catastrophic. I approach Solidity development with the rigour that demands: OpenZeppelin primitives for proven security patterns, comprehensive unit and integration test coverage with Hardhat, fuzz testing with Foundry, and a deliberate gas optimisation pass before any mainnet deployment.
I've built and deployed to production on Binance Smart Chain — including a blockchain banking platform with Uniswap SDK integration for token swaps, Web3.js-powered wallet interfaces, and custom Solidity contracts handling real user funds. That production experience shapes how I think about transaction error handling, gas estimation, MEV protection, and the UX challenges unique to on-chain interactions.
On the frontend, I use wagmi and RainbowKit to handle the full wallet connection lifecycle — supporting 400+ wallets via WalletConnect, hardware wallets via Ledger, and mobile wallets. Transaction flows are designed with clear confirmation states, human-readable descriptions of what the user is signing, and graceful handling of rejections and network errors.
Live
Production smart contracts deployed on Binance Smart Chain with real user funds.
100%
Test coverage on every smart contract before mainnet deployment.
Core Capabilities
Proven engineering solutions for complex, real-world business problems.
Smart Contract Development
ERC-20, ERC-721, ERC-1155, custom DeFi protocols, staking contracts, and governance systems — written in Solidity with OpenZeppelin security primitives and 100% test coverage.
DeFi & DEX Integrations
Uniswap V2/V3 SDK integration, token swap interfaces, liquidity pool displays, AMM slippage calculation, and real-time price feeds via Chainlink oracles.
Wallet & Web3 Frontend
wagmi, RainbowKit, and Ethers.js integration supporting MetaMask, WalletConnect, Coinbase Wallet, and hardware wallets with proper transaction UX.
NFT Platforms
ERC-721/1155 contracts with on-chain/IPFS metadata, reveal mechanics, allowlists, royalty enforcement (ERC-2981), and minting UI with gas estimation.
Testing & Audit Prep
Hardhat unit tests, Foundry fuzz testing, gas optimisation, and vulnerability review against the SWC registry — preparing contracts for independent audit.
Deployment & Verification
Hardhat deploy scripts for testnet and mainnet, automatic Etherscan/BscScan verification, and upgrade patterns (OpenZeppelin Upgrades) for evolvable contracts.
The Engagement Process
Protocol Design
Define the contract architecture, token economics, access control model, and upgrade strategy before writing code.
Contract Development
Implement in Solidity with OpenZeppelin base contracts, NatSpec documentation, and events for every state change.
Testing & Fuzzing
Unit tests in Hardhat, fuzz testing with Foundry, gas usage reporting, and reentrancy/overflow checks against SWC vulnerabilities.
Testnet Deployment
Deploy to testnet, verify on explorer, and run the full frontend integration against the deployed contracts before mainnet.
Mainnet & Monitoring
Mainnet deployment with gas optimisation, Etherscan verification, and on-chain event monitoring for the deployed contracts.
Primary Technology Stack
Pricing & Investment
Blockchain development pricing reflects the security-critical nature of the work — bugs in smart contracts can result in irreversible fund loss. Every engagement includes thorough testing and a pre-deployment security review.
Smart Contract
£3,000 – £12,000
Solidity contract development, unit and integration tests, gas optimisation, testnet deployment, and a security review. Covers ERC-20, ERC-721, ERC-1155, and custom logic.
Ideal for: Token launches, NFT collections, simple DeFi mechanics, DAO governance contracts
DeFi Application
£12,000 – £35,000
Full DeFi frontend with Web3 wallet connection, contract interaction layer, real-time price feeds, liquidity pool interfaces, and transaction management with error handling.
Ideal for: DEX interfaces, yield farming platforms, staking dashboards, liquidity protocols
Full Web3 Platform
£35,000+
Multi-contract system with upgradeability, cross-chain bridges, backend indexing with The Graph, analytics dashboard, and formal security audit from a third-party auditor.
Ideal for: Protocol launches, Web3 marketplaces, enterprise blockchain integrations
All smart contract work includes comprehensive test coverage and a pre-deployment security checklist. For high-value contracts, a third-party audit from a specialist firm is strongly recommended and can be arranged.
Frequently Asked Questions
Related Services
Web Development
Full-stack Next.js frontends for your blockchain application.
API Development
Off-chain APIs and indexing services for your Web3 product.
AI & Automation
AI-powered analytics and automation layered onto on-chain data.
Cloud & DevOps
Infrastructure for the off-chain components of your Web3 product.
Ready to Build on the Blockchain?
Let's talk about your protocol design, token economics, or Web3 product — and build it with the engineering standards that keep real user funds safe.