Senior Blockchain & Backend Engineer (Solidity/Web3)

Talenzaa; New York (NY); On-site; USD 180,000 - 240,000; Full time

Job summary

Talenzaa in New York / New Jersey is seeking a senior software engineer with 8+ years of backend experience and 2-4 years in Web3 to build blockchain applications and smart contracts. You will work with Solidity, testing frameworks, and Web3 libraries to deliver secure, scalable systems.

The role emphasizes modern backend development, DevOps, and cross-chain interoperability, with expectations of strong security practices and collaboration in a distributed team.

Qualifications

• 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

Skills

Backend development

Web3 knowledge

Smart contract development

Blockchain fundamentals

Security best practices

DevOps practices

Agile/Scrum

Education

Bachelor's degree in CS or related

Tools

Java/Spring

Node.js

Docker

Kubernetes

Hardhat/Foundry/Truffle

Web3 libraries (Web3J/Web3JS/Ethers.js/Viem)

Job description

Talenzaa in New York / New Jersey is seeking a senior software engineer with 8+ years of backend experience and 2-4 years in Web3 to build blockchain applications and smart contracts. You will work with Solidity, testing frameworks, and Web3 libraries to deliver secure, scalable systems.

The role emphasizes modern backend development, DevOps, and cross-chain interoperability, with expectations of strong security practices and collaboration in a distributed team.