Blockchain Developer

Digital Assets Web3 Engineer NYC NY / Jersey City NJ Open for Fulltime The successful candidate will contribute to the design, development, and deployment of Web3-native components and integrations that power Citi's digital asset infrastructure — spanning tokenization, smart contracts, on-chain settlement, and blockchain protocol integrations. You will work within a collaborative, globally distributed team of engineers, architects, and business technologists who are building the next generation of institutional digital finance capabilities .We are looking for someone who brings strong Web3 engineering fundamentals, a curiosity for emerging blockchain ecosystems, and the ability to bridge decentralized technology patterns with enterprise-grade software standards .Key Responsibilitie sDesign, develop, and deplo y Web3 components and integrations for Citi's Digital Asset Platform, including smart contracts, on-chain event listeners, wallet integrations, and blockchain protocol connector sBuild and maintai n backend services that interface with public and permissioned blockchain networks (e.g., Ethereum, Hyperledger Besu, Corda, or equivalent )Develop, test, and audi t smart contracts written in Solidity or equivalent languages, ensuring security, correctness, and gas efficienc yIntegrate Web3 libraries and SDK s (e.g., Web3J, Web3JS, Ethers.js, Viem) into enterprise Java and/or Node.js backend service sImplement asynchronous, event-driven architecture s to handle on-chain events, transaction lifecycle management, and blockchain state synchronizatio nCollaborate with architects and senior engineer s to contribute to the design of scalable, secure, and resilient Web3 infrastructur eParticipate in code review s, providing and receiving constructive technical feedback to maintain high engineering standard sSupport the integratio n of digital asset custody solutions, tokenization frameworks, and DeFi/TradFi bridging component sContribute to technical documentatio n, including smart contract specifications, integration guides, and architecture note sStay curren t with the rapidly evolving Web3 ecosystem — tracking protocol upgrades, new token standards, Layer 2 solutions, and emerging tooling relevant to institutional use case sWork within Agile/Scrum framework s, participating in sprint planning, stand-ups, and retrospectives within a distributed global tea mHelp identify and resolv e technical issues across the Web3 stack, escalating where appropriate to ensure delivery quality and timeline sQualifications / Experienc eBachelor's degree in Computer Science, Engineering, or a related discipline; MS is a plu s8+ year s of overall software engineering experience, with a strong backend development foundatio n2 to 4 year s of hands-on experience in Web3 and blockchain application developmen t, including smart contract development and blockchain protocol integratio n3 to 5 year s of experience with backend developmen t using Java/Spring, Node.js, or equivalent enterprise framework sProficiency in Solidit y smart contract development, including testing frameworks (Hardhat, Foundry, Truffle) and security best practice sHands-on experience with Web3 librarie s such as Web3J, Web3JS, Ethers.js, or Vie mSolid understanding of blockchain fundamental s — consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, and key managemen tExperience with token standard s (ERC-20, ERC-721, ERC-1155, ERC-3525, or equivalent) and tokenization pattern sFamiliarity with permissioned blockchain network s (Hyperledger Besu, Fabric, Corda, or R3) is a strong plu sExperience with asynchronous programmin g, event-driven systems, and message queuing (Kafka, RabbitMQ, or equivalent )Familiarity with DevOps practice s, containerization (Docker, Kubernetes), and CI/CD pipeline sUnderstanding of cryptographic concept s — digital signatures, hashing, PKI, and secure key management — as applied to blockchain system sExposure to Layer 2 scaling solution s (Polygon, Optimism, zkSync, etc.) and cross-chain interoperability protocols is a plu sExperience in financial services or regulated industrie s is a plu sFamiliarity with Agile/Scru m methodologies and distributed team collaboration tool sCompetencies / Skill sWeb3 Engineering Depth : Strong command of the Web3 technology stack — from smart contract development to on-chain/off-chain integration patterns and blockchain node interactio nBackend Engineering Fundamentals : Solid grounding in enterprise software engineering — API design, microservices, data structures, algorithms, and design pattern sSecurity Mindset : Awareness of common smart contract vulnerabilities (reentrancy, front-running, integer overflow, etc.) and best practices for secure on-chain developmen tCuriosity & Adaptability : Genuine enthusiasm for the Web3 ecosystem and the ability to rapidly learn and apply new protocols, standards, and toolin gCollaborative Spirit : Strong team player who communicates clearly and constructively with engineers, architects, and non-technical stakeholder sDelivery Orientation : Ability to manage personal delivery commitments, prioritize effectively, and produce high-quality output within sprint cycle sAttention to Detail : Rigorous approach to testing, code quality, and documentation — particularly important given the immutable nature of on-chain deployment sTooling Proficiency : Working knowledge of engineering tools including Git, Jira, Jenkins, Hardhat/Foundry, Docker, Helm, and observability platform sDevelopment Valu eAs a Digital Assets Web3 Engineer at Citi, you will be at the forefront of one of the most exciting and strategically significant technology domains in institutional finance. You will :Work on real-world, production-grade Web3 infrastructur e at the scale and complexity of a global systemically important ban kGain deep exposur e to institutional digital asset use cases — including tokenized securities, digital cash, on-chain settlement, and programmable financ eCollaborate with world-class engineers, architects, and business leader s who are defining the future of digital finance at Cit iBuild expertise across both Web3-native and enterprise technology stack s, making you a uniquely versatile engineer in a rapidly growing fiel dAccess continuous learning opportunitie s, including emerging protocol research, industry conferences, and internal innovation program sContribute to a platform with global reach and real commercial impac t, with visibility across Citi's technology and business leadershi p When applying, mention the word CANDYSHOP to show you read the job post completely.