Enterprise Web3 Platform Architect

Pyramid Consulting, Inc; New York (NY); On-site; USD 140,000 - 210,000; Full time

Job summary

Citi is seeking a senior Web3 backend engineer to design, develop, and deploy Web3 components for the Digital Asset Platform, including smart contracts, on-chain listeners, wallet integrations, and protocol connectors.

You will work with Java/Spring or Node.js backends, implement event-driven architectures, and ensure security and gas efficiency in smart contracts. Experience with Solidity and Web3 libraries is required.

Qualifications

• Bachelor's degree in Computer Science, Engineering, or related field.
• 8+ years in software engineering with strong backend foundation.
• 2–4 years in Web3 and blockchain app development including smart contracts.
• 3–5 years backend development with Java/Spring or Node.js.
• Proficiency in Solidity and testing frameworks (Hardhat, Foundry, Truffle).
• Hands-on with Web3 libraries: Web3J, Web3JS, Ethers.js, Viem.
• Solid understanding of blockchain basics, token standards, and wallets.
• Experience with permissioned networks (Hyperledger Besu, Fabric, Corda) is a plus.
• Asynchronous programming, event-driven systems, and DevOps familiarity.

Responsibilities

• Design, develop, and deploy Web3 components and integrations for Citi's Digital Asset Platform.
• Build backends interfacing with public and permissioned blockchains (Ethereum, Besu, Corda).
• Develop, test, and audit Solidity contracts for security and efficiency.
• Integrate Web3 libraries into enterprise Java and/or Node.js backends.
• Implement event-driven architectures for on-chain events and lifecycle management.
• Collaborate with architects to design scalable, secure Web3 infrastructure.
• Participate in code reviews to uphold engineering standards.
• Support custody solutions, tokenization frameworks, and DeFi/TradFi bridging.
• Contribute to technical docs including specs and integration guides.
• Stay updated on protocol upgrades, token standards, Layer 2s, and tooling.

Skills

Web3 backend

Solidity

Java/Spring

Node.js

Security best practices

DevOps

Kubernetes

Web3 libraries

Education

Bachelor's degree in Computer Science or related

MS preferred

Tools

Web3J

Web3JS

Ethers.js

Viem

Docker

Kubernetes

Git

Jira

Job description

Citi is seeking a senior Web3 backend engineer to design, develop, and deploy Web3 components for the Digital Asset Platform, including smart contracts, on-chain listeners, wallet integrations, and protocol connectors.

You will work with Java/Spring or Node.js backends, implement event-driven architectures, and ensure security and gas efficiency in smart contracts. Experience with Solidity and Web3 libraries is required.