BLOCKCHAIN DEVELOPER - CITI BANK

SIDRAM TECHNOLOGIES; Green Curve Heights (NJ); On-site; USD 150,000 - 230,000; Full time

Job summary

Citi Bank seeks an experienced Blockchain Developer in the New York / Jersey City area to design, develop, and deploy Web3 components for Citi's Digital Asset Platform, including smart contracts, wallet solutions, and asset infrastructure.

You will build backend services connecting to public and permissioned networks, test and audit secure contracts, and collaborate with global teams in an Agile environment.

Qualifications

• 10+ years of software development experience.
• Strong expertise in blockchain and Web3 technologies.
• Experience with smart contract design, testing, and audits.
• Proficient in backend development with Java/Spring or Node.js.
• Hands-on experience with Ethereum, Besu or Corda.
• Familiarity with DevOps and CI/CD pipelines.

Responsibilities

• Build and integrate Web3 components, smart contracts and blockchain protocols.
• Develop backend services connecting to public and permissioned blockchain networks.
• Build, test and audit secure and gas-efficient smart contracts.
• Implement event-driven architectures for on-chain events and transaction lifecycle management.
• Support digital asset custody, tokenization and DeFi/TradFi integrations.
• Collaborate with architects and senior engineers on scalable and secure Web3 infrastructure.
• Participate in code reviews, testing, documentation and Agile/Scrum delivery.

Skills

Blockchain / Web3 Development

Solidity Smart Contracts

Ethereum / Hyperledger Besu / Corda

Java / Spring

Node.js

Web3J / Web3JS / Ethers.js / Viem

Smart Contract Testing (Hardhat /Found

Tools

Web3J

Web3.js

Ethers.js

Viem

Hardhat

Foundry

Truffle

Hyperledger Besu

Docker

Kubernetes

Jira

Jenkins

Helm

Git

Job description

NOW HIRING: BLOCKCHAIN DEVELOPER CITI BANK

Client:

Citi Bank

Location:

New York, NY / Jersey City, NJ

Position Type:

Full-Time

Experience:

10+ Years

Role Overview

Seeking an experienced Blockchain Developer to design, develop, and deploy Web3 components and integrations for Citi s Digital Asset Platform, including smart contracts, blockchain integrations, wallet solutions, and digital asset infrastructure.

Must-have Skills

• Blockchain / Web3 Development
• Solidity Smart Contracts
• Ethereum / Hyperledger Besu / Corda or equivalent
• Java / Spring or Node.js
• Web3J / Web3JS / Ethers.js / Viem
• Smart Contract Testing Hardhat / Foundry / Truffle
• Blockchain Fundamentals Consensus, Transactions, Gas & Wallet Infrastructure
• ERC-20 / ERC-721 / ERC-1155 / ERC-3525
• Event-Driven Architecture / Asynchronous Programming
• Kafka / RabbitMQ
• Docker / Kubernetes / CI/CD
• Cryptography Digital Signatures, Hashing, PKI & Key Management
• Git / Jira / Jenkins / Helm

Preferred / Plus Skills

• Hyperledger Besu / Fabric / Corda / R3
• Layer 2 Polygon / Optimism / zkSync
• Cross-Chain Interoperability
• Digital Asset Custody
• Tokenization / DeFi / TradFi
• Financial Services / Regulated Industry Experience
• Agile / Scrum

Key Responsibilities

• Build and integrate Web3 components, smart contracts and blockchain protocols.
• Develop backend services connecting to public and permissioned blockchain networks.
• Build, test and audit secure and gas-efficient smart contracts.
• Implement event-driven architectures for on-chain events and transaction lifecycle management.
• Support digital asset custody, tokenization and DeFi/TradFi integrations.
• Collaborate with architects and senior engineers on scalable and secure Web3 infrastructure.
• Participate in code reviews, testing, documentation and Agile/Scrum delivery.

IDEAL CANDIDATE

• Strong Web3 engineering and backend development background
• Strong security mindset and knowledge of smart contract vulnerabilities
• Excellent problem-solving and communication skills
• Strong understanding of APIs, microservices, data structures and design patterns
• Ability to work effectively with global, distributed engineering teams