swaprail - Wallet Engineer
Requirements
• Strong proficiency in JavaScript / TypeScript • Hands-on experience with Web3 libraries (ethers.js, viem, web3.js) • Deep understanding of EVM transaction lifecycle and structure • Experience implementing wallet connection and signing flows in production • Familiarity with RPC providers, node inconsistencies, and network reliability issues • Experience building or contributing to Web3 applications (DEX, wallet, aggregator, etc.) • Experience with multi-chain environments (Ethereum, Arbitrum, BSC, Polygon, etc.) • Familiarity with account abstraction (ERC-4337) • Experience with smart contract interaction patterns (multicall, proxy, upgradeable contracts) • Understanding of MEV, slippage, and transaction execution risks • Experience working on DeFi protocols or trading-related products
Responsibilities
• Integrate major Web3 wallets (e.g., MetaMask, WalletConnect, Coinbase Wallet) across web and mobile environments • Design and implement secure transaction signing pipelines (EIP-1559, EIP-712, typed data, permit flows) • Build robust wallet connection systems, including session persistence, reconnection, and multi-account handling • Implement transaction building logic, including calldata construction, batching, and multi-step execution flows • Develop gas estimation, fee optimization, and fallback strategies across different networks • Handle edge cases such as nonce management, transaction replacement (speed up / cancel), and re-org scenarios • Collaborate with backend teams on routing, simulation, and execution layers • Work closely with frontend teams to ensure seamless UX for wallet interactions and transaction confirmations • Ensure high security standards in key handling, signing flows, and user interaction surfaces
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