Blockchain Developer / Block chain Engineer

JC CORPORATIONS
7 days ago

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English
Experience level
Intermediate

Job location

Remote

Tech stack

Java
Code Review
Collaborative Software
DevOps
Digital Assets
Digital Signature
Enterprise Architecture Framework
Java Platform Enterprise Edition (J2EE)
Key Management
Node.js
Public Key Infrastructure
Scrum
Queueing Systems
RabbitMQ
Blockchain
Software Engineering
Backend
Event Driven Architecture
Hyperledger
Containerization
Kubernetes
Information Technology
Ethereum
Solidity
Kafka
Web3.js
Asynchronous Programming
Docker

Job description

  • 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
  • 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 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
  • Help identify and resolve technical issues across the Web3 stack, escalating where appropriate to ensure delivery quality and timelines

Requirements

  • 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
  • 2 to 4 years of hands-on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integration
  • 3 to 5 years of 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
  • Familiarity with Agile/Scrum methodologies and distributed team collaboration tools

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