Wallet Engineer

## 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

## 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.)

## Nice to Have
– 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