BLOCKCHAIN DEVELOPER - CITI BANK

Seeking an experienced Blockchain Developer to design, develop, and deploy Web3 components and integrations for Citi’s Digital Asset Platform, including smart contracts, blockchain integrations, wallet solutions, and digital asset infrastructure., * Blockchain / Web3 Development

• Solidity Smart Contracts
• Ethereum / Hyperledger Besu / Corda or equivalent
• Java / Spring or Node.js
• Web3J / Web3JS / Ethers.js / Viem
• Smart Contract Testing Hardhat / Foundry / Truffle
• Blockchain Fundamentals Consensus, Transactions, Gas & Wallet Infrastructure
• ERC-20 / ERC-721 / ERC-1155 / ERC-3525
• Event-Driven Architecture / Asynchronous Programming
• Kafka / RabbitMQ
• Docker / Kubernetes / CI/CD
• Cryptography Digital Signatures, Hashing, PKI & Key Management
• Git / Jira / Jenkins / Helm, * Build and integrate Web3 components, smart contracts and blockchain protocols.
• Develop backend services connecting to public and permissioned blockchain networks.
• Build, test and audit secure and gas-efficient smart contracts.
• Implement event-driven architectures for on-chain events and transaction lifecycle management.
• Support digital asset custody, tokenization and DeFi/TradFi integrations.
• Collaborate with architects and senior engineers on scalable and secure Web3 infrastructure.
• Participate in code reviews, testing, documentation and Agile/Scrum delivery.

• Hyperledger Besu / Fabric / Corda / R3
• Layer 2 Polygon / Optimism / zkSync
• Cross-Chain Interoperability
• Digital Asset Custody
• Tokenization / DeFi / TradFi
• Financial Services / Regulated Industry Experience
• Agile / Scrum, * Strong Web3 engineering and backend development background
• Strong security mindset and knowledge of smart contract vulnerabilities
• Excellent problem-solving and communication skills
• Strong understanding of APIs, microservices, data structures and design patterns
• Ability to work effectively with global, distributed engineering teams