Desenvolvedor Full Stack /Web3

 Job Opening: Java Developer for Smart Contract Integration (Web3)

We are looking for an experienced full stack developer to lead the integration between a token sales portal and a ethereum smart contract .

 Responsibilities

• Implement Web3 integration  to interact with the Ethereum smart contract (testnet & mainnet).
• Call and manage functions like buy, sell, distributeSalesphases, advanceSalePhase, etc.
• Fetch real-time on-chain data such as token balances, sale phase status, Chainlink price feeds, etc.
• Handle wallet connections and transaction signing (e.g., MetaMask, WalletConnect).
• Ensure secure, reliable, and efficient interaction with the blockchain.
• Collaborate with the smart contract and frontend teams to complete the full integration flow.

 Requirements

• Strong experience in Firebase backend development.
• Solid understanding of Ethereum blockchain fundamentals.
• Familiarity with Web3 libraries, especially Web3j.
• Experience working with Ethereum testnets (Sepolia) and tools like Remix, MetaMask, and Etherscan.
• Good understanding of Solidity
• Proven projects with smart contract development or similar integrations.
• Ability to handle transaction gas estimation, error handling, and contract method encoding.

 Nice to Have

• Experience writing or working with Solidity smart contracts.
• Knowledge of token sale mechanisms (private/pre/public sales).
• Previous experience integrating token sales into real-world portals.
• Experience with blockchain development environments (e.g., Ganache, Hardhat).

 Work Setup

• Remote
• Freelance or milestone-based project
• Start: ASAP

 How to Apply

Please send your CV, portfolio (if available), and/or relevant Web3 integration experience to:

[email protected] with the subject: Java Developer - Web3 Integration