Senior Web3 Engineer: Smart Contracts & Blockchain

The Bitcoin Street Journal; New York, Northern (NY, KY); Hybrid; USD 150,000 - 210,000; Full time

Job summary

SIDRAM TECHNOLOGIES is recruiting a Blockchain Developer to design, develop, and deploy Web3 components for Citi Bank's digital asset platform. You will build smart contracts, integrate with networks, and implement secure asset infrastructure.

Ideal candidates bring extensive Web3 engineering and backend experience, focus on security, and can collaborate with global teams in a fast-paced financial tech setting.

Qualifications

• Must have blockchain / Web3 development experience.
• Proficient in Solidity and smart contracts.
• Experience with Ethereum or Hyperledger Besu / Corda.
• Backend development with Java/Spring or Node.js.
• Familiar with smart contract testing frameworks.
• Strong knowledge of ERC-20/721/1155/3525 standards.
• Understanding cryptography and PKI for secure assets.

Responsibilities

• Build and integrate Web3 components and smart contracts for platforms.
• Develop backend services connecting to public and permissioned networks.
• Create gas-efficient, secure smart contracts and audits.
• Implement event-driven architectures for on-chain events.
• Support digital asset custody, tokenization, and DeFi/TradFi integrations.
• Collaborate with architects and senior engineers on scalable infra.
• Participate in code reviews, testing, and Agile delivery.

Skills

Blockchain/Web3

Solidity Contracts

Ethereum/Hyperledger/Corda

Java/Spring or Node.js

Web3 Libraries (Web3J/Web3JS/Ethers.js

Smart Contract Testing

Blockchain Fundamentals

ERC Standards

Event-Driven Architecture

Cryptography/PKI

Tools

Web3J

Web3JS

Ethers.js

Viem

Hardhat

Foundry

Truffle

Job description

SIDRAM TECHNOLOGIES is recruiting a Blockchain Developer to design, develop, and deploy Web3 components for Citi Bank's digital asset platform. You will build smart contracts, integrate with networks, and implement secure asset infrastructure.

Ideal candidates bring extensive Web3 engineering and backend experience, focus on security, and can collaborate with global teams in a fast-paced financial tech setting.