Senior Software Engineer - Blockchain

About the Role We're seeking a Senior Blockchain Developer with deep expertise in Solidity and Node.js to design, develop, and deploy scalable blockchain solutions. You'll build secure smart contracts, architect backend APIs, and collaborate with cross-functional teams to deliver high-performance decentralized applications (dApps) and Web3 infrastructure. Key Responsibilities Design and implement smart contracts on EVM-compatible chains using Solidity. Develop, test, and deploy backend APIs and microservices in Node.js for blockchain integration. Optimize smart contract gas usage, ensure security best practices, and perform code audits. Integrate blockchain nodes, wallets, oracles, and cross-chain bridges. Collaborate with frontend, DevOps, and product teams to deliver complete dApp solutions. Maintain and enhance existing blockchain architecture and SDKs. Research new blockchain technologies (Layer-2, zk, rollups, cross-chain). Requirements 5+ years of total software development experience. 3+ years in Solidity and EVM-based development. Strong proficiency with Node.js, Express, and TypeScript. Deep understanding of smart contract design patterns, ERC standards, and DeFi protocols. Experience with Web3.js, Ethers.js, Hardhat, Foundry, or Truffle. Knowledge of RESTful / GraphQL APIs, microservices, and event-driven architectures. Familiarity with Ethereum, Polygon, Binance Smart Chain, or other L2 networks. Version control with Git, CI/CD pipelines, and test automation. Nice to have: Experience with Rust, Go, or Substrate. Understanding of cryptographic primitives, Merkle trees, and zero-knowledge proofs. Exposure to IPFS, The Graph, or Chainlink. Prior contribution to open-source blockchain projects. Soft Skills Strong problem-solving and analytical mindset. Passion for decentralized tech and Web3 innovation. Excellent communication and team collaboration skills. Sample Teck Stack Languages: Solidity, JavaScript/TypeScript, Node.js Frameworks: Hardhat, Truffle, Express.js Libraries: Ethers.js, Web3.js Databases: MongoDB, PostgreSQL Tools: Docker, GitHub Actions, AWS, Infura, Alchem Job Type : Hybrid Location : DHA Phase 6 Lahore About Us : TEKHQS is a global technology solutions provider headquartered in Lake Forest, California, with an offshore team of 300+ experts based in Pakistan. We specialize in Web 2.0 (Web & Mobile App Development), Web 3.0 (Blockchain & Crypto Platform Development), AI/ML Solutions, and ERP services as a certified partner of SAP S/4HANA, Oracle NetSuite, and Microsoft Dynamics 365 Business Central. Our expertise includes implementation, training, customization, integration, support, IT staff augmentation, and certified ERP consultancy.