Blockchain Senior Java Engineer - Digital Assets Platform
$142.3k - $213.5k+ Incentive awards + Retention awards
Expert
Bachelor's, Master's
New York, NY, USA
Hybrid
Software EngineeringBlockchain & Smart Contract Engineering
About the job
Requirements
- A Bachelor's degree in Computer Science, Engineering, or a related discipline is required; a Master of Science is a plus.
- 10 to 15 years of overall software engineering experience, with a strong backend development foundation.
- 3 to 5 years of hands-on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integration.
- 8 to 12 years of experience with backend development using Java/Spring, Node.js, or equivalent enterprise frameworks.
- Proficiency in smart contract development, including testing frameworks such as Hardhat, Foundry, and Truffle, and security best practices.
- Hands-on experience with Web3 libraries such as Web3J, Web3JS, Ethers.js, or Viem.
- A solid understanding of blockchain fundamentals, including consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, and key management.
- Experience with token standards such as ERC-20, ERC-721, ERC-1155, and ERC-3525, or equivalent, and tokenization patterns.
- Experience with asynchronous programming, event-driven systems, and message queuing such as Kafka or RabbitMQ, or equivalent.
- Familiarity with DevOps practices, containerization using Docker and Kubernetes, and CI/CD pipelines.
- Understanding of cryptographic concepts, including digital signatures, hashing, PKI, and secure key management, as applied to blockchain systems.
- Familiarity with Agile/Scrum methodologies and distributed team collaboration tools.
- Strong command of the Web3 technology stack, from smart contract development to on-chain/off-chain integration patterns and blockchain node interaction.
- A solid grounding in enterprise software engineering, including API design, microservices, data structures, algorithms, and design patterns.
- Awareness of common smart contract vulnerabilities, including reentrancy, front-running, and integer overflow, and best practices for secure on-chain development.
- Working knowledge of engineering tools including Git, Jira, Jenkins, Hardhat/Foundry, Docker, Helm, and observability platforms.
- Ability to manage personal delivery commitments, prioritize effectively, and produce high-quality output within sprint cycles.
- A rigorous approach to testing, code quality, and documentation, particularly given the immutable nature of on-chain deployments.
Responsibilities
- Design, develop, and deploy Web3 components and integrations for the 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 such as Ethereum, Hyperledger Besu, Canton, and Solana, or equivalent networks.
- Develop, test, and audit smart contracts written in Solidity or equivalent languages, ensuring security, correctness, and gas efficiency.
- Integrate Web3 libraries and SDKs such as Web3J, Web3JS, Ethers.js, and 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.
- Collaborate with architects and senior engineers to contribute to the design of scalable, secure, and resilient Web3 infrastructure.
- Participate in code reviews, providing and receiving constructive technical feedback to maintain high engineering standards.
- Support the integration of digital asset custody solutions, tokenization frameworks, and DeFi/TradFi bridging components.
- Contribute to technical documentation, including smart contract specifications, integration guides, and architecture notes.
- Stay current with the evolving Web3 ecosystem by 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.
- Help identify and resolve technical issues across the Web3 stack, escalating where appropriate to ensure delivery quality and timelines.
Desired Qualifications
- Familiarity with blockchain networks such as Hyperledger Besu, Solana, and Canton.
- Exposure to Layer 2 scaling solutions such as Polygon, Optimism, and zkSync, and cross-chain interoperability protocols.
- Experience in financial services or regulated industries.
About the company
Citi runs banking, investment and payment services for companies, governments and individuals around the world. Its global network connects institutions with local banking systems, while its US consumer business sells credit cards and deposit accounts. Corporate clients use Citi to manage cash, finance trade and raise capital, and investors use its trading, custody and wealth services to hold and manage assets. The bank earns interest on loans and fees from payments, securities transactions, financial advice and account services. Citi traces its banking roots to 1812; the Citigroup holding company was formed in 1998, and its headquarters are in New York City.
Company Size
10,001+
Company Stage
IPO
Headquarters
New York City, New York
Founded
1812
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Simplify's Take
What believers are saying
- Revenue is expanding: Citi reported $24.8 billion in the June 2026 quarter, up 14% year over year.
- US parents get protected time: eligible Citi employees receive 16 weeks of bonding leave at full base pay.
- Institutional deposits are sticky: Citi says around 80% of Services deposits come from clients with relationships exceeding 15 years.
What critics are saying
- Lending losses remain substantial: Citi's net credit losses reached $2.4 billion in the June 2026 quarter.
- Australian hybrid roles require office time: Citi sets a minimum of three office days weekly for designated hybrid positions.
- Job cuts carry a cost: Citi booked roughly $500 million in severance in the March 2026 quarter.
What makes Citi unique
- Corporate payments move at scale: Citi processes around $6 trillion daily through its Treasury and Trade business.
- Deposits move beyond banking hours: Citi Token Services transfers cash between participating Citi branches around the clock.
- Employees use a shared AI workspace: Citi's Stylus platform reaches over 180,000 people for research and multi-step workflows.
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Benefits
- Health Insurance
- Dental Insurance
- Vision Insurance
- Life Insurance
- Disability Insurance
- 401(k) Retirement Plan
- 401(k) Company Match
- Wellness Program
- Paid Vacation
- Paid Sick Leave
- Paid Holidays