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Blockchain Developer (Solidity, Web3, MERN)

Remote · Portugal Full-time

We are seeking a skilled Blockchain Developer to join our team and contribute to the development of decentralized applications, smart contracts, and Web3-enabled platforms. The ideal candidate has hands-on experience building blockchain solutions and integrating them with modern web applications. You will work closely with frontend and backend engineers to design, develop, and deploy scalable blockchain-based features while ensuring security, performance, and reliability.

Responsibilities

  • Design, develop, test, and deploy smart contracts using Solidity.
  • Build and maintain decentralized application (DApp) functionality.
  • Integrate blockchain networks and smart contracts into web applications using ethers.js, wagmi, or web3.js.
  • Implement wallet connectivity and transaction flows using MetaMask and other popular Web3 wallets.
  • Develop user-facing features with React and Tailwind CSS.
  • Build and maintain backend services and APIs using Node.js and Express.
  • Integrate blockchain data with backend systems and databases.
  • Participate in architecture discussions and technical decision-making.
  • Write clean, maintainable, and well-documented code.
  • Ensure security best practices are followed throughout the development lifecycle.

Required Qualifications

  • Proven experience developing smart contracts with Solidity.
  • Strong understanding of Ethereum and EVM-compatible blockchains.
  • Experience with Web3 development tools and libraries such as ethers.js, wagmi, or web3.js.
  • Proficiency in React.js and modern JavaScript/TypeScript.
  • Experience with Node.js, Express, and MongoDB.
  • Familiarity with wallet integrations including MetaMask and WalletConnect.
  • Understanding of blockchain security concepts and smart contract vulnerabilities.
  • Experience using Git and collaborative development workflows.

Preferred Qualifications

  • Experience with Hardhat, Foundry, or similar development frameworks.
  • Knowledge of DeFi protocols, staking systems, token standards, or NFT platforms.
  • Experience deploying and maintaining applications on Ethereum or other EVM-compatible networks.
  • Familiarity with CI/CD pipelines and automated testing.
  • Experience building scalable production-grade Web3 applications.

Application Requirements Please include the following with your application:

  • Resume or CV
  • GitHub profile
  • Portfolio or examples of blockchain-related projects
  • Brief summary of your experience with Solidity and Web3 development

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