Design, 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 connectors
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
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
