Business Needs Inc. is hiring a

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 deploy 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 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 efficienc
• yIntegrate Web3 libraries and SDKs (e.g., Web3J, Web3JS, Ethers.js, Viem) into enterprise Java and/or Node.js backend service
• sImplement asynchronous, event-driven architectures to handle on-chain events, transaction lifecycle management, and blockchain state synchronizatio
• nCollaborate with architects and senior engineers to contribute to the design of scalable, secure, and resilient Web3 infrastructur
• eParticipate in code reviews, providing and receiving constructive technical feedback to maintain high engineering standard
• sSupport the integration of digital asset custody solutions, tokenization frameworks, and DeFi/TradFi bridging component
• sContribute to technical documentation, including smart contract specifications, integration guides, and architecture note
• sStay current 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 frameworks, participating in sprint planning, stand-ups, and retrospectives within a distributed global tea
• mHelp identify and resolve 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+ years of overall software engineering experience, with a strong backend development foundatio
• n2 to 4 years of hands-on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integratio
• n3 to 5 years of experience with backend development using Java/Spring, Node.js, or equivalent enterprise framework
• sProficiency in Solidity smart contract development, including testing frameworks (Hardhat, Foundry, Truffle) and security best practice
• sHands-on experience with Web3 libraries such as Web3J, Web3JS, Ethers.js, or Vie
• mSolid understanding of blockchain fundamentals — consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, and key managemen
• tExperience with token standards (ERC-20, ERC-721, ERC-1155, ERC-3525, or equivalent) and tokenization pattern
• sFamiliarity with permissioned blockchain networks (Hyperledger Besu, Fabric, Corda, or R3) is a strong plu
• sExperience with asynchronous programming, event-driven systems, and message queuing (Kafka, RabbitMQ, or equivalent
• )Familiarity with DevOps practices, containerization (Docker, Kubernetes), and CI/CD pipeline
• sUnderstanding of cryptographic concepts — digital signatures, hashing, PKI, and secure key management — as applied to blockchain system
• sExposure to Layer 2 scaling solutions (Polygon, Optimism, zkSync, etc.) and cross-chain interoperability protocols is a plu
• sExperience in financial services or regulated industries is a plu
• sFamiliarity with Agile/Scrum 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 infrastructure at the scale and complexity of a global systemically important ban
• kGain deep exposure 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 leaders who are defining the future of digital finance at Cit
• iBuild expertise across both Web3-native and enterprise technology stacks, making you a uniquely versatile engineer in a rapidly growing fiel
• dAccess continuous learning opportunities, including emerging protocol research, industry conferences, and internal innovation program
• sContribute to a platform with global reach and real commercial impact, with visibility across Citi's technology and business leadershi

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