Web3 Developer

Role Summary

We 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

• →Replace direct window.ethereum integrations with a structured wallet layer using wagmi and viem

• →Implement wallet connection, disconnection, account switching, and network switching

• →Handle missing wallets, rejected requests, incorrect networks, RPC failures, reverted transactions, and transaction timeouts

• →Build reusable hooks and components for wallet state, contract reads, contract writes, and transaction tracking

• →Complete the platform's token-purchase experience end to end — connect wallet, select network, review transaction, submit, track states, display result

• →Read token balances directly from deployed contracts and replace hardcoded values with on-chain data

• →Implement gas estimation and user-friendly transaction status displays

• →Connect blockchain transactions with the platform's backend APIs where off-chain records are required

• →Coordinate with the Full-Stack Developer on transaction history, notifications, and database persistence

• →Coordinate with the Frontend Developer to connect wallet and contract functionality to production interfaces

• →Prepare reusable integration patterns for digital payments, NFT minting, marketplace transactions, auctions, token rewards, staking, and blockchain-backed verification

• →Define consistent project patterns for contract hooks, wallet state, transaction lifecycle, error handling, and network configuration

• →Keep private keys, RPC credentials, and sensitive configuration outside the source code

• →Write clear, maintainable, strongly typed TypeScript code

• →Document contract interfaces, deployed addresses, supported networks, and integration decisions

• →Participate in code reviews and technical architecture discussions

Required Skills

• →Strong professional experience with Web3 or blockchain application development

• →Strong knowledge of Ethereum-compatible networks and smart-contract integration

• →Experience integrating ERC-20 and token-sale contracts into user-facing applications

• →Experience configuring EVM networks, RPC endpoints, contract addresses, and ABIs

• →Experience integrating wallets such as MetaMask into web applications

• →Practical experience with wagmi and viem, or equivalent modern Ethereum libraries

• →Strong TypeScript and JavaScript skills

• →Experience with React and Next.js

• →Understanding of contract reads, writes, transaction receipts, event logs, gas estimation, and network configuration

• →Understanding of wallet account changes and chain changes

• →Ability to design reusable blockchain integration layers

• →Understanding of common wallet, transaction, and smart-contract integration risks

• →Experience writing unit and integration tests

• →Ability to explain technical decisions clearly and work effectively in a distributed team

• →At least one prior project involving blockchain integration (wallet connection, contract reads/writes, transaction tracking, or token integration)

Preferred Skills

• →Experience integrating token-sale or token-distribution contracts

• →Familiarity with ERC-20 and other relevant EVM contract standards

• →Experience with blockchain event indexing or event-driven application architecture

• →Experience integrating blockchain transactions with backend APIs and databases

• →Familiarity with Prisma, PostgreSQL, SQLite, or similar database technologies

• →Experience with Socket.IO, WebSockets, or real-time notification systems

• →Experience supporting testnet or production contract integrations

• →Familiarity with upgradeable contracts, multisignature administration, and contract-pause states from an integration perspective

• →Previous work involving NFTs, marketplaces, staking, vesting, or DeFi protocols

• →Experience working with Electron applications

What We Evaluate

• →Relevant Web3 and blockchain integration experience

• →Wallet integration quality

• →Smart-contract integration ability

• →Transaction-flow understanding

• →Code quality and TypeScript usage

• →Security awareness

• →Problem-solving approach

• →Communication

• →Reliability

• →Ability to explain previous work

• →Performance during the CareProof assessment

Application Requirements

• →Resume or CV

• →LinkedIn profile

• →GitHub or GitLab profile

• →Portfolio or relevant Web3 or blockchain project links

• →Short explanation of your contribution to each referenced project

• →Details of deployed smart contracts you personally integrated into web applications

• →Current location and time zone

• →Availability and preferred work type (full-time, part-time, or long-term contract)

• →Compensation expectations