3 months 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 is a public financial-services company offering consumer and institutional banking, credit cards, wealth management, treasury and trade solutions, and capital-markets services. It serves individuals, corporations, financial institutions, and governments in more than 160 countries and jurisdictions, earning interest and fee income from lending, payments, trading, and advisory. Founded in 1812 and headquartered in New York, it trades on the NYSE under the ticker C.