28 days ago
Base Salary
$142k - $213k/yr
Responsibilities
- Design, develop, and deploy Web3 components and integrations including smart contracts, on-chain event listeners, wallet integrations, and blockchain protocol connectors.
- Build and maintain backend services interfacing with public and permissioned blockchain networks.
- Develop, test, and audit smart contracts for security, correctness, and gas efficiency.
- Integrate Web3 libraries and SDKs into enterprise Java and/or Node.js backend services.
- Implement asynchronous, event-driven architectures for on-chain events, transaction lifecycle management, and blockchain state synchronization.
- Contribute to scalable, secure, and resilient Web3 infrastructure through architecture collaboration, code reviews, documentation, and issue resolution.
- Support digital asset custody, tokenization, DeFi/TradFi bridging, and other institutional digital asset integrations.
- Track protocol upgrades, token standards, Layer 2 solutions, and emerging Web3 tooling.
- Participate in Agile/Scrum ceremonies and collaborate with globally distributed engineering and business teams.
Requirements
- Bachelor’s degree in Computer Science, Engineering, or a related discipline; a master’s degree is a plus.
- 12+ years of overall software engineering experience with a strong backend development foundation.
- 3–5 years of hands-on Web3 and blockchain application development experience, including smart contracts and protocol integration.
- 4–6 years of backend development experience using Java/Spring, Node.js, or equivalent enterprise frameworks.
- Proficiency in Solidity, smart contract testing frameworks, and security best practices.
- Experience with Web3J, Web3JS, Ethers.js, or Viem.
- Understanding of blockchain consensus, transaction lifecycles, gas models, wallets, key management, token standards, and tokenization patterns.
- Experience with asynchronous programming, event-driven systems, and message queuing such as Kafka or RabbitMQ.
- Familiarity with Docker, Kubernetes, DevOps practices, and CI/CD pipelines.
- Understanding of cryptographic concepts including digital signatures, hashing, PKI, and secure key management.
- Exposure to Layer 2 solutions such as Polygon, Optimism, and zkSync, and to cross-chain interoperability protocols is a plus.
- Familiarity with Hyperledger Besu, Solana, or Canton, financial services or regulated industries, Agile/Scrum, and distributed-team collaboration is a plus.
- Working knowledge of Git, Jira, Jenkins, Hardhat or Foundry, Docker, Helm, and observability platforms.
Benefits
- Full-time position based in New York, New York.
- Medical, dental, and vision coverage.
- 401(k), life, accident, and disability insurance.
- Wellness programs.
- Paid vacation, sick leave, and holidays.
- Continuous learning opportunities including protocol research, industry conferences, and internal innovation programs.
Tech Stack
Categories
About Citi
Citi's mission is to serve as a trusted partner to our clients by responsibly providing financial services that enable growth and economic progress. Our core activities are safeguarding assets, lending money, making payments and accessing the capital markets on behalf of our clients. We have over 200 years of experience helping our clients meet the world's toughest challenges and embrace its greatest opportunities. We are Citi, the global bank – an institution connecting millions of people across hundreds of countries and cities. For information on Citi’s commitment to privacy, visit on.citi/privacy.