What are the responsibilities and job description for the Blockchain Web3 Engineer (100% Onsite - FTE) position at Cleo Consulting Inc.?
Job ID: 410999
Job Title: Blockchain Web3 Engineer
Location: New York City, NY
Onsite
Must Have Technical/Functional Skills
- Core Web3 / Blockchain Skills (Must-Have)
- Strong understanding of blockchain fundamentals:
- transactions, blocks, gas/fees, wallets/keys, RPC, finality, consensus basics
- Hands-on experience with smart contracts:
- Solidity (preferred) and development tooling (Hardhat/Foundry/Truffle/Remix)
- Experience working with EVM-based chains (Ethereum/Polygon/Arbitrum/Optimism/BSC)
- or enterprise chains (Hyperledger Fabric/Corda/Quorum) depending on project
Roles & Responsibilities
- Smart Contract Engineering & Web3 Development
- Design, develop, and maintain smart contracts (Solidity/Vyper or relevant stack) aligned to product and security requirements.
- Build backend/Web3 components for contract interaction:
- Transaction orchestration, signature flows, nonce management, gas strategies
- Web3 SDK integrations
- Develop and manage contract deployment pipelines, including ABI/versioning, migrations, upgrade strategies (proxy patterns), and release coordination.
- Implement secure patterns for contracts:
- Support smart contract testing:
- Node Operations & Infrastructure
- Deploy, configure, and operate blockchain nodes and supporting infrastructure:
- Full nodes/archival nodes, RPC endpoints, validator nodes (as applicable)
- Manage node upgrades, chain configuration changes, and incident response for production networks.
- Implement operational tooling for:
- Node health checks, RPC performance monitoring, log aggregation, and alerting
- Handle blockchain-specific reliability concerns:
- Re-org handling, finality considerations, peer connectivity, RPC failover, rate limiting
“Cleo Consulting is an equal opportunity employer (Minorities/Women/Veterans/Disabled)”
Salary : $100,000 - $130,000