BLOCKCHAIN DEVELOPER - CITI BANK

SIDRAM TECHNOLOGIES; New York (NY); On-site; USD 170,000 - 260,000; Full time

Job summary

Citi Bank is seeking an experienced Blockchain Developer to design, develop, and deploy Web3 components for its Digital Asset Platform. You will work on smart contracts, wallet solutions, and cross-network integrations, collaborating with global engineering teams.

Ideal candidates bring 10+ years in blockchain, strong security focus, and hands-on experience with Ethereum ecosystems, token standards, and DevOps practices to deliver scalable, compliant infrastructure.

Qualifications

• 10+ years of experience in Blockchain/Web3 development.
• Experience designing, developing and deploying smart contracts and backend integrations for digital asset platforms.
• Strong knowledge of Ethereum-compatible networks, and token standards (ERC-20/721/1155).
• Familiarity with security best practices and smart contract audit concepts.

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 lifecycle management.
• Support digital asset custody, tokenization and DeFi/TradFi integrations.
• Collaborate with architects and senior engineers on scalable Web3 infrastructure.
• Participate in code reviews, testing, documentation and Agile/Scrum delivery.

Skills

Blockchain / Web3 Development

Solidity Smart Contracts

Java / Spring or Node.js

Web3J / Web3JS / Ethers.js / Viem

Smart Contract Testing

ERC-20 / ERC-721 / ERC-1155 / ERC-3525

Event-Driven Architecture

Kafka / RabbitMQ

Docker / Kubernetes / CI/CD

Cryptography / PKI & Key Management

Git / Jira / Jenkins / Helm

Tools

Web3J / Web3JS / Ethers.js / Viem

Docker

Kubernetes

CI/CD

Git

Jira

Jenkins

Helm

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