SIDRAM TECHNOLOGIES is hiring a

BLOCKCHAIN DEVELOPER - CITI BANK

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

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