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SwapRail

Wallet Engineer

LocationRemote
Work moderemote
Typepart-time
DepartmentEngineering
Company size1+ people
First seen2mo ago
Last seen1d ago
Responsibilities
Build secure, reliable, and scalable wallet integrations and transaction flows for the SwapRail platform, focusing on connectivity, signing, and execution across multiple chains.
Location: Remote / Work from Home
Type: Part-time preferred / Full-time available
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
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Handle edge cases such as nonce management, transaction replacement (speed up / cancel), and re-org scenarios
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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
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
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Familiarity with RPC providers, node inconsistencies, and network reliability issues
•
Experience building or contributing to Web3 applications (DEX, wallet, aggregator, etc.)
Nice to have
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
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