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 lifecycles, and blockchain state synchronization.
- Collaborate on scalable, secure, and resilient Web3 infrastructure and participate in code reviews.
- Support digital asset custody, tokenization, and DeFi/TradFi bridging integrations.
- Create technical documentation and investigate and resolve technical issues across the Web3 stack.
- Track protocol upgrades, token standards, Layer 2 solutions, and emerging institutional Web3 tooling.
- Participate in Agile/Scrum ceremonies and distributed-team delivery processes.
Requirements
- Bachelor’s degree in Computer Science, Engineering, or a related discipline; a master’s degree is a plus.
- 10–15 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.
- 8–12 years of backend development experience using Java/Spring, Node.js, or equivalent enterprise frameworks.
- Proficiency with smart contract development, Hardhat, Foundry, Truffle, Web3J, Web3JS, Ethers.js, or Viem.
- Understanding of blockchain consensus, transaction lifecycles, gas models, wallet infrastructure, 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, CI/CD pipelines, Git, Jira, Jenkins, Helm, and observability platforms.
- Understanding of cryptography, digital signatures, hashing, PKI, secure key management, and smart contract vulnerabilities.
- Exposure to Layer 2 scaling solutions and cross-chain interoperability protocols is a plus.
- Experience in financial services or regulated industries is a plus.
- Strong communication, collaboration, delivery, testing, documentation, and adaptability skills.
Benefits
- Medical, dental, and vision coverage.
- 401(k), life, accident, and disability insurance.
- Wellness programs.
- Paid vacation, sick leave, and holidays.
- Continuous learning opportunities, industry conferences, and internal innovation programs.
- Full-time role based in New York, New York.
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.