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Role: Blockchain Developer/Architect
Location: New York, NY 10013 / Jersey City, NJ 07310
Position Type: Fulltime
Key Responsibilities
- 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
- 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
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
- Hands-on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integration
- 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
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
- Tooling Proficiency: Working knowledge of engineering tools including Git, Jira, Jenkins, Hardhat/Foundry, Docker, Helm, and observability platforms
What does a Java developer in web3 do?
A Java developer in web3 would likely be focused on developing applications that use the Java programming language in the context of the web3 technology stack
Web3 is a collective term used to refer to the next generation of decentralized, blockchain-based technologies that are aimed at creating a more open and secure internet
In this context, a Java developer would be responsible for writing code that interacts with web3 technologies, such as decentralized applications (DApps) and smart contracts, to create new tools and services that run on the blockchain
This could involve working with cutting-edge technologies such as Ethereum, which is a popular blockchain platform that uses the Java programming language, as well as other web3 technologies and frameworks.