Blockchain Developer

Quick Facts

• Role: Blockchain Developer
• Work model: 100% Remote (U.S.)
• Employment: Full-time, Direct W2
• Salary: $140,000–$200,000 annually
• Experience: 6+ years
• Visa note: U.S. citizens, Green Card holders, EAD holders, and H-1B transfer candidates encouraged; new H-1B petitions not sponsored

Description

Design and build secure, scalable enterprise blockchain solutions including dApps, smart contracts, and blockchain-integrated backend services for financial services, digital asset management, and enterprise transaction processing. Develop wallet integrations, tokenization platforms, blockchain APIs, event listeners, indexing services, and off-chain processing components that integrate with cloud-native microservices and enterprise applications.

Key Responsibilities

• Design and develop secure smart contracts for enterprise blockchain applications using Solidity (or other smart contract languages)
• Build scalable backend services for transaction processing, asset management, and identity verification
• Develop RESTful and GraphQL APIs to expose blockchain functionality to web and mobile applications
• Design blockchain data models, token standards, and transaction workflows for high-volume systems
• Integrate enterprise applications with Ethereum, Hyperledger Fabric, Polygon, Avalanche, or other blockchain platforms
• Develop secure wallet integrations, digital signature workflows, and key management solutions
• Implement blockchain event listeners, indexing services, and off-chain processing components
• Build scalable microservices using .NET Core, Java, or Node.js to interact with blockchain networks
• Optimize smart contracts for gas efficiency, scalability, and transaction throughput
• Perform smart contract audits, security testing, and vulnerability assessments before production deployments
• Collaborate with DevOps teams to deploy blockchain infrastructure on Azure or AWS
• Participate in architecture/code reviews and production support; troubleshoot incidents and network/transaction issues

Requirements

• 6+ years of professional software development experience for enterprise distributed applications
• 3+ years of hands-on blockchain development delivering production blockchain solutions
• Solidity and EVM-compatible smart contract development experience
• Experience with blockchain platforms such as Ethereum, Hyperledger Fabric, Polygon, Avalanche, Binance Smart Chain, or Quorum
• Proficiency in JavaScript/TypeScript with Node.js or backend development with C#/.NET Core or Java
• dApp development experience with React, Angular, or Vue.js
• Strong understanding of blockchain architecture, consensus, cryptographic hashing, digital signatures, Merkle trees, and distributed ledger concepts
• Experience with ERC-20, ERC-721, ERC-1155, or custom token standards
• Wallet integration experience (MetaMask, WalletConnect, Coinbase Wallet, or enterprise custody)
• Experience with REST, GraphQL, WebSockets, and blockchain RPC interfaces
• Experience with SQL/NoSQL databases (PostgreSQL, SQL Server, MongoDB, Redis)
• Hands-on Git, CI/CD pipelines, automated deployments, and release management
• Experience deploying on Azure or AWS
• Debugging, performance optimization, and troubleshooting skills in production environments
• Agile Scrum team experience

Benefits

• Salary range: $140,000–$200,000 annually
• Remote work (U.S.)
• Direct W2 employment