Wallet Engineer (Web3)

TL;DR

Wallet Engineer (Web3): Build secure, reliable, and scalable wallet integrations and transaction flows for the hirify.global platform with an accent on connectivity, signing, and execution across multiple chains. Focus on designing secure transaction signing pipelines, implementing robust connection systems, and handling edge cases like nonce management and re-org scenarios.

Location: Remote / Work from Home

Company

hirify.global is a Web3 platform focused on cross-chain swaps and transactions.

What you will do

• Integrate major Web3 wallets like MetaMask, WalletConnect, and Coinbase Wallet across web and mobile.
• Design and implement secure transaction signing pipelines including EIP-1559, EIP-712, and permit flows.
• Build wallet connection systems with session persistence, reconnection, and multi-account support.
• Develop transaction building logic, gas estimation, fee optimization, and fallback strategies.
• Handle edge cases such as nonce management, transaction replacement, and re-orgs.
• Collaborate with backend and frontend teams on routing, simulation, execution, and seamless UX.

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.