Blockchain Developer

Role: Block chain Developer Location: Jersey City, NJ/New York, NY Type: Fulltime Key Responsibilities • Build and maintain backend services that interface with public and permissioned blockchain networks (e.g., Ethereum, Hyperledger Besu, Corda, or equivalent) • Develop, test, and audit smart contracts written in Solidity or equivalent languages, ensuring security, correctness, and gas efficiency • Integrate Web3 libraries and SDKs (e.g., Web3J, Web3JS, Ethers.js, Viem) into enterprise Java and/or Node.js backend services • Implement asynchronous, event-driven architectures to handle on-chain events, transaction lifecycle management, and blockchain state synchronization • Collaborate with architects and senior engineers to contribute to the design of scalable, secure, and resilient Web3 infrastructure • Participate in code reviews, providing and receiving constructive technical feedback to maintain high engineering standards • Support the integration of digital asset custody solutions, tokenization frameworks, and DeFi/TradFi bridging components • Contribute to technical documentation, including smart contract specifications, integration guides, and architecture notes • Stay current with the rapidly evolving Web3 ecosystem — tracking protocol upgrades, new token standards, Layer 2 solutions, and emerging tooling relevant to institutional use cases • Work within Agile/Scrum frameworks, participating in sprint planning, stand-ups, and retrospectives within a distributed global team • Help identify and resolve technical issues across the Web3 stack, escalating where appropriate to ensure delivery quality and timelines Qualifications / Experience • Bachelor's degree in Computer Science, Engineering, or a related discipline; MS is a plus • 8+ years of overall software engineering experience, with a strong backend development foundation • 2 to 4 years of hands-on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integration • 3 to 5 years of experience with backend development using Java/Spring, Node.js, or equivalent enterprise frameworks • Proficiency in Solidity smart contract development, including testing frameworks (Hardhat, Foundry, Truffle) and security best practices • Hands-on experience with Web3 libraries such as Web3J, Web3JS, Ethers.js, or Viem • Solid understanding of blockchain fundamentals — consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, and key management • Experience with token standards (ERC-20, ERC-721, ERC-1155, ERC-3525, or equivalent) and tokenization patterns • Familiarity with permissioned blockchain networks (Hyperledger Besu, Fabric, Corda, or R3) is a strong plus • Experience with asynchronous programming, event-driven systems, and message queuing (Kafka, RabbitMQ, or equivalent) • Familiarity with DevOps practices, containerization (Docker, Kubernetes), and CI/CD pipelines • Understanding of cryptographic concepts — digital signatures, hashing, PKI, and secure key management — as applied to blockchain systems • Exposure to Layer 2 scaling solutions (Polygon, Optimism, zkSync, etc.) and cross-chain interoperability protocols is a plus • Experience in financial services or regulated industries is a plus • Familiarity with Agile/Scrum methodologies and distributed team collaboration tools Competencies / Skills • Web3 Engineering Depth: Strong command of the Web3 technology stack — from smart contract development to on-chain/off-chain integration patterns and blockchain node interaction • Backend Engineering Fundamentals: Solid grounding in enterprise software engineering — API design, microservices, data structures, algorithms, and design patterns • Security Mindset: Awareness of common smart contract vulnerabilities (reentrancy, front-running, integer overflow, etc.) and best practices for secure on-chain development • Curiosity & Adaptability: Genuine enthusiasm for the Web3 ecosystem and the ability to rapidly learn and apply new protocols, standards, and tooling • Collaborative Spirit: Strong team player who communicates clearly and constructively with engineers, architects, and non-technical stakeholders • Delivery Orientation: Ability to manage personal delivery commitments, prioritize effectively, and produce high-quality output within sprint cycles • Attention to Detail: Rigorous approach to testing, code quality, and documentation — particularly important given the immutable nature of on-chain deployments • Tooling Proficiency: Working knowledge of engineering tools including Git, Jira, Jenkins, Hardhat/Foundry, Docker, Helm, and observability platforms When applying, mention the word CANDYSHOP to show you read the job post completely.