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TechHavenLabs

HR Manager

Role SummaryWe are hiring a Web3 Developer to build the foundational blockchain integration infrastructure for the TechHavenLabs platform. This is a critical early-stage engineering role. You will be responsible for implementing the wallet architecture, transaction flows, deployed-contract integrations, and on-chain application layer. You will work closely with Full-Stack and Frontend developers to introduce production-ready Web3 functionality into an existing Next.js platform.Responsibilities<ul><li>→Replace direct window.ethereum integrations with a structured wallet layer using wagmi and viem</li><li>→Implement wallet connection, disconnection, account switching, and network switching</li><li>→Handle missing wallets, rejected requests, incorrect networks, RPC failures, reverted transactions, and transaction timeouts</li><li>→Build reusable hooks and components for wallet state, contract reads, contract writes, and transaction tracking</li><li>→Complete the platform's token-purchase experience end to end — connect wallet, select network, review transaction, submit, track states, display result</li><li>→Read token balances directly from deployed contracts and replace hardcoded values with on-chain data</li><li>→Implement gas estimation and user-friendly transaction status displays</li><li>→Connect blockchain transactions with the platform's backend APIs where off-chain records are required</li><li>→Coordinate with the Full-Stack Developer on transaction history, notifications, and database persistence</li><li>→Coordinate with the Frontend Developer to connect wallet and contract functionality to production interfaces</li><li>→Prepare reusable integration patterns for digital payments, NFT minting, marketplace transactions, auctions, token rewards, staking, and blockchain-backed verification</li><li>→Define consistent project patterns for contract hooks, wallet state, transaction lifecycle, error handling, and network configuration</li><li>→Keep private keys, RPC credentials, and sensitive configuration outside the source code</li><li>→Write clear, maintainable, strongly typed TypeScript code</li><li>→Document contract interfaces, deployed addresses, supported networks, and integration decisions</li><li>→Participate in code reviews and technical architecture discussions</li></ul>Required Skills<ul><li>→Strong professional experience with Web3 or blockchain application development</li><li>→Strong knowledge of Ethereum-compatible networks and smart-contract integration</li><li>→Experience integrating ERC-20 and token-sale contracts into user-facing applications</li><li>→Experience configuring EVM networks, RPC endpoints, contract addresses, and ABIs</li><li>→Experience integrating wallets such as MetaMask into web applications</li><li>→Practical experience with wagmi and viem, or equivalent modern Ethereum libraries</li><li>→Strong TypeScript and JavaScript skills</li><li>→Experience with React and Next.js</li><li>→Understanding of contract reads, writes, transaction receipts, event logs, gas estimation, and network configuration</li><li>→Understanding of wallet account changes and chain changes</li><li>→Ability to design reusable blockchain integration layers</li><li>→Understanding of common wallet, transaction, and smart-contract integration risks</li><li>→Experience writing unit and integration tests</li><li>→Ability to explain technical decisions clearly and work effectively in a distributed team</li><li>→At least one prior project involving blockchain integration (wallet connection, contract reads/writes, transaction tracking, or token integration)</li></ul>Preferred Skills<ul><li>→Experience integrating token-sale or token-distribution contracts</li><li>→Familiarity with ERC-20 and other relevant EVM contract standards</li><li>→Experience with blockchain event indexing or event-driven application architecture</li><li>→Experience integrating blockchain transactions with backend APIs and databases</li><li>→Familiarity with Prisma, PostgreSQL, SQLite, or similar database technologies</li><li>→Experience with <a target="_blank" rel="noopener noreferrer nofollow ugc" class="break-all link-break text-gray-500 hover:underline" href="http://Socket.IO">Socket.IO</a>, WebSockets, or real-time notification systems</li><li>→Experience supporting testnet or production contract integrations</li><li>→Familiarity with upgradeable contracts, multisignature administration, and contract-pause states from an integration perspective</li><li>→Previous work involving NFTs, marketplaces, staking, vesting, or DeFi protocols</li><li>→Experience working with Electron applications</li></ul>What We Evaluate<ul><li>→Relevant Web3 and blockchain integration experience</li><li>→Wallet integration quality</li><li>→Smart-contract integration ability</li><li>→Transaction-flow understanding</li><li>→Code quality and TypeScript usage</li><li>→Security awareness</li><li>→Problem-solving approach</li><li>→Communication</li><li>→Reliability</li><li>→Ability to explain previous work</li><li>→Performance during the CareProof assessment</li></ul>Application Requirements<ul><li>→Resume or CV</li><li>→LinkedIn profile</li><li>→GitHub or GitLab profile</li><li>→Portfolio or relevant Web3 or blockchain project links</li><li>→Short explanation of your contribution to each referenced project</li><li>→Details of deployed smart contracts you personally integrated into web applications</li><li>→Current location and time zone</li><li>→Availability and preferred work type (full-time, part-time, or long-term contract)</li><li>→Compensation expectations</li></ul>