Blockchain Developer

Description

Job Summary: We are seeking a passionate Blockchain Developer to work on the development, implementation, and maintenance of Blockchain and Web3 solutions. Key Highlights: 1. Inclusive, collaborative, and continuously evolving environment 2. Development and maintenance of Blockchain and Web3 solutions 3. Focus on security, scalability, and code quality Are you passionate about technology and innovation, and do you want to be part of an inclusive, collaborative, and continuously evolving environment? Then this opportunity is for you! At Capgemini, we value the balance between personal and professional life. Therefore, we offer flexible work models—ranging from hybrid to on-site—depending on project requirements. Our goal is to provide you with the best experience, respecting your lifestyle and promoting well-being. We are looking for a Blockchain Developer to join our team. Responsibilities: * Develop, implement, and maintain smart contracts using Solidity on Ethereum/EVM networks (Polygon, Arbitrum, Optimism, among others). * Design, develop, and maintain Blockchain and Web3 solutions, ensuring security, scalability, and code quality. * Create, test, and audit smart contracts using frameworks such as Hardhat, Foundry, and Truffle. * Apply smart contract security practices, including static analysis, automated testing, fuzz testing, and simulations using tools like Slither, Mythril, Echidna, and Tenderly. * Develop and integrate Web3 solutions with frontend and backend applications using Ethers.js, Web3.js, Wagmi/Viem. * Work with tokens and digital assets, including NFTs (ERC-721). * Implement enterprise blockchain solutions using Hyperledger Fabric and Besu, as well as integrations via Cacti and Firefly, where applicable. * Develop and maintain backend services using Node.js and TypeScript, consuming and exposing REST and GraphQL APIs. Use The Graph for efficient on-chain data indexing and querying. * Support configuration and usage of containerized infrastructure with Docker. * Apply best practices for code versioning, review, documentation, and collaboration in Git environments (GitHub/GitLab). * Participate in CI/CD pipelines, ensuring quality, test automation, and secure deployment. * Collaborate with cross-functional teams (product, backend, frontend, and security) throughout the development lifecycle. Technical Requirements * Solid experience developing smart contracts using Solidity. * Practical knowledge of Ethereum and EVM-compatible networks such as Polygon, Arbitrum, and Optimism. * Experience with security standards and libraries such as OpenZeppelin. Experience with NFTs, especially the ERC-721 standard. * Hands-on experience with smart contract development frameworks such as Hardhat, Foundry (Forge, Cast, Anvil), and/or Truffle. * Knowledge of smart contract testing and security, including tools such as Slither, Mythril/MythX, Echidna, and Tenderly. * Experience integrating Web3 using Ethers.js, Web3.js, Wagmi, and/or Viem. Knowledge or experience with Hyperledger solutions such as Fabric, Besu, Cacti, and Firefly. * Backend development experience with Node.js and TypeScript. * Experience consuming and building REST and/or GraphQL APIs. Knowledge of The Graph for on-chain data indexing and querying. * Experience with Docker for containerized environments. Proficiency with code versioning tools (Git, GitHub, and/or GitLab). * Experience with CI/CD pipelines and best practices for continuous delivery. Diversity, Inclusion, and Belonging At Capgemini, you can be yourself. We value diversity in all its forms and foster an inclusive environment through committees such as: * Women@Capgemini – Female empowerment and gender equity. * Capgemini Black – Representation and appreciation of Black culture. * LGBTQIA+@Capgemini, Capgemini Accessibility, among others. Our commitment is ongoing: we are recognized by GPTW, Bloomberg Gender Equality Index, EDGE, and Ethisphere as one of the world’s most ethical and inclusive companies. Our job openings are open to everyone, regardless of color, ethnicity, religion, age, gender identity, sexual orientation, or disability. Comprehensive Well-being: * Medical and dental insurance. * Gympass and Equilibrium (physical and mental health). * Private pension plan and life insurance. * Family Care Program: extended maternity and paternity leave, fertility support, personalized health and well-being guidance. * Meal allowance, remote work allowance, benefits club, and much more! Make It Real At Capgemini, we unleash human potential through technology to build a more inclusive, sustainable, and innovative future. If you share these values, join us in transforming the world!