SwapRail Jobs

Wallet Engineer

SwapRail

Wallet Engineer

Reposted One Month Ago

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Remote

Hiring Remotely in USA

Mid level

Remote

Hiring Remotely in USA

Mid level

Build and maintain secure, scalable wallet integrations and transaction flows across web and mobile. Implement signing pipelines (EIP-1559/EIP-712), connection/session handling, transaction building, gas estimation and fallback strategies, nonce and re-org handling, and collaborate with backend and frontend teams to ensure secure, reliable wallet UX and execution across multiple chains.

The summary above was generated by AI

Build secure, reliable, and scalable wallet integrations and transaction flows for the Biti 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

- 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

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