Block Chain Architect

Lorven Technologies Inc.; Jersey City (NJ); Hybrid; USD 120,000 - 170,000; Full time

Job summary

Lorven Technologies Inc. is seeking a Blockchain Developer to design, build, and deploy Web3 components for a major digital asset platform.

You will develop backend services interfacing with multiple blockchain networks, write and audit Solidity contracts, and integrate Web3 libraries into enterprise backends. Ideal candidates have 8+ years in software engineering, 2–4 years in Web3, and strong knowledge of Solidity, security, and token standards.

Qualifications

• Bachelor's degree in Computer Science, Engineering, or related discipline; MS preferred.
• 8+ years of overall software engineering experience with strong backend focus.
• 2–4 years in Web3 and blockchain app development, including smart contracts.
• 3–5 years backend development using Java/Spring, Node.js, or equivalent.
• Proficiency in Solidity and testing with Hardhat, Foundry, or Truffle; security best practices.
• Hands-on with Web3 libraries like Web3J, Web3JS, Ethers.js, or Viem.
• Solid understanding of blockchain fundamentals and token standards.
• Experience with permissioned networks (Hyperledger Besu, Fabric, Corda, etc.).

Responsibilities

• Design, develop, and deploy Web3 components for Citi's Digital Asset Platform.
• Build backend services interfacing with public and permissioned blockchains.
• Develop, test, and audit Solidity smart contracts for security and gas efficiency.
• Integrate Web3 libraries into enterprise Java/Node.js backends.
• Implement event-driven architecture for on-chain event handling and state sync.
• Collaborate with architects to design scalable, secure Web3 infrastructure.
• Participate in code reviews and maintain high engineering standards.
• Support digital asset custody, tokenization, and DeFi/TradFi bridging components.
• Contribute to technical docs: smart contract specs, integration guides, architecture notes.
• Stay updated on Web3 protocol upgrades and new tooling for institutional use cases.
• Work in Agile/Scrum with distributed global teams and sprint ceremonies.
• Identify and resolve cross-stack issues to ensure timely delivery.

Skills

Web3 stack

Backend engineering

Security mindset

Agility & learning

Collaboration

Delivery orientation

Attention to detail

DevOps tooling

Education

Bachelor's in CS/Engineering

MS is a plus

Tools

Web3J

Web3JS

Ethers.js

Viem

Hardhat

Foundry

Truffle

Docker

Kubernetes

Git

Jira

Jenkins

Job description

Role: Blockchain Developer

Location: New York, NY/Jersey City, NJ

Position Type: Fulltime

Key Responsibilities

• Design, develop, and deploy Web3 components and integrations for Citi s Digital Asset Platform, including smart contracts, on‑chain event listeners, wallet integrations, and blockchain protocol connectors
• Build and maintain backend services that interface with public and permissioned blockchain networks (e.g., Ethereum, Hyperledger Besu, Corda, or equivalent)
• Develop, test, and audit smart contracts written in Solidity or equivalent languages, ensuring security, correctness, and gas efficiency
• Integrate Web3 libraries and SDKs (e.g., Web3J, Web3JS, Ethers.js, Viem) into enterprise Java and/or Node.js backend services
• Implement asynchronous, event-driven architectures to handle on-chain events, transaction lifecycle management, and blockchain state synchronization
• Collaborate with architects and senior engineers to contribute to the design of scalable, secure, and resilient Web3 infrastructure
• Participate in code reviews, providing and receiving constructive technical feedback to maintain high engineering standards
• Support the integration of digital asset custody solutions, tokenization frameworks, and DeFi/TradFi bridging components
• Contribute to technical documentation, including smart contract specifications, integration guides, and architecture notes
• Stay current with the rapidly evolving Web3 ecosystem — tracking protocol upgrades, new token standards, Layer 2 solutions, and emerging tooling relevant to institutional use cases
• Work within Agile/Scrum frameworks, participating in sprint planning, stand‑ups, and retrospectives within a distributed global team
• Help identify and resolve technical issues across the Web3 stack, escalating where appropriate to ensure delivery quality and timelines

Qualifications / Experience

• Bachelor s degree in Computer Science, Engineering, or a related discipline; MS is a plus
• 8+ years of overall software engineering experience, with a strong backend development foundation
• 2 to 4 years of hands‑on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integration
• 3 to 5 years of experience with backend development using Java/Spring, Node.js, or equivalent enterprise frameworks
• Proficiency in Solidity smart contract development, including testing frameworks (Hardhat, Foundry, Truffle) and security best practices
• Hands‑on experience with Web3 libraries such as Web3J, Web3JS, Ethers.js, or Viem
• Solid understanding of blockchain fundamentals — consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, and key management
• Experience with token standards (ERC-20, ERC-721, ERC-1155, ERC-3525, or equivalent) and tokenization patterns
• Familiarity with permissioned blockchain networks (Hyperledger Besu, Fabric, Corda, or R3) is a strong plus
• Experience with asynchronous programming, event-driven systems, and message queuing (Kafka, RabbitMQ, or equivalent)
• Familiarity with DevOps practices, containerization (Docker, Kubernetes), and CI/CD pipelines
• Understanding of cryptographic concepts — digital signatures, hashing, PKI, and secure key management — as applied to blockchain systems
• Exposure to Layer 2 scaling solutions (Polygon, Optimism, zkSync, etc.) and cross-chain interoperability protocols is a plus
• Experience in financial services or regulated industries is a plus
• Familiarity with Agile/Scrum methodologies and distributed team collaboration tools

Competencies / Skills

• Web3 Engineering Depth: Strong command of the Web3 technology stack — from smart contract development to on-chain/off‑chain integration patterns and blockchain node interaction
• Backend Engineering Fundamentals: Solid grounding in enterprise software engineering — API design, microservices, data structures, algorithms, and design patterns
• Security Mindset: Awareness of common smart contract vulnerabilities (reentrancy, front‑running, integer overflow, etc.) and best practices for secure on‑chain development
• Curiosity & Adaptability: Genuine enthusiasm for the Web3 ecosystem and the ability to rapidly learn and apply new protocols, standards, and tooling
• Collaborative Spirit: Strong team player who communicates clearly and constructively with engineers, architects, and non‑technical stakeholders
• Delivery Orientation: Ability to manage personal delivery commitments, prioritize effectively, and produce high‑quality output within sprint cycles
• Attention to Detail: Rigorous approach to testing, code quality, and documentation — particularly important given the immutable nature of on‑chain deployments
• Tooling Proficiency: Working knowledge of engineering tools including Git, Jira, Jenkins, Hardhat/Foundry, Docker, Helm, and observability platforms