Crypto Developer
on Upwork — Solidity, Web3, DeFi

Yes, I have built numerous crypto trading bots for clients on Upwork. My bots integrate with major exchange APIs including Binance, Bybit, Kraken, and Coinbase. I implement strategies such as market making, arbitrage, grid trading, DCA, and custom indicator-based approaches. Bots are built with Node.js or Python, include proper risk management, stop-loss mechanisms, and can be deployed on cloud servers for 24/7 operation. I also provide a web dashboard for monitoring performance and adjusting parameters in real time.

I have deep experience building and interacting with DeFi protocols including DEXs (Uniswap, PancakeSwap, SushiSwap), lending platforms (Aave, Compound), yield aggregators, and staking contracts. I understand Automated Market Maker (AMM) mechanics, liquidity pool dynamics, impermanent loss calculations, and yield farming strategies. I can fork and customize existing protocols, write integration contracts, or build original DeFi applications from scratch. Security is my top priority — I follow Consensys best practices, use OpenZeppelin libraries, and conduct thorough testing.

Smart contract security is critical and I approach it systematically. Every contract I write follows the Checks-Effects-Interactions pattern, uses ReentrancyGuard where applicable, and is thoroughly tested with Hardhat tests achieving high coverage. I use static analysis tools like Slither and Mythril, review contract code for common vulnerabilities (reentrancy, oracle manipulation, flash loan attacks, front-running), and perform gas optimization. For client projects, I recommend third-party audits for high-value contracts and always include emergency pause mechanisms and upgradeability patterns when appropriate.

I offer flexible engagement models depending on project scope. For well-defined deliverables like a specific smart contract or a trading bot, I provide fixed-price quotes with clear milestones and deliverables. For ongoing development such as building a complete dApp platform or providing continuous maintenance, I work on an hourly basis or monthly retainer. Every engagement includes requirements gathering, architecture design, development, testing, deployment support, and a revision period. I communicate regularly via Upwork messaging and provide transparent progress updates.

Absolutely. I have experience building NFT projects end-to-end including ERC-721 and ERC-1155 contract development, lazy minting, reveal mechanics, marketplace integration (OpenSea, LooksRare), IPFS/Arweave metadata storage, and minting dApps with React frontends. I can implement royalty standards (EIP-2981), on-chain metadata, and custom auction mechanisms. I also understand NFT utility mechanics including staking, breeding, and governance integration for PFP collections and gaming assets.

Blockchain project pricing varies significantly based on complexity, security requirements, and timeline. Simple ERC-20 token contracts start from $500. Custom DeFi protocols or complex dApps range from $3000-$15000+. Trading bots range from $1000-$5000 depending on strategy complexity and number of exchange integrations. I provide detailed proposals with line-item estimates after understanding your requirements. All projects include thorough testing, deployment scripts, and documentation. I use Upwork's escrow system for payment protection on both sides.

My daily tech stack includes Solidity with Hardhat and Foundry for smart contract development, ethers.js and web3.js for blockchain interaction, React and Next.js for dApp frontends, Node.js and Express for backend services, The Graph for subgraph indexing, IPFS/Filecoin for decentralized storage, and Docker for deployment. For testing I use Hardhat's built-in test runner, Waffle, and Chai. I also work with TypeScript for type safety across both frontend and backend codebases. I stay current with EIPs and ecosystem developments through Ethereum Magicians, GitHub discussions, and developer communities.