We are seeking a highly skilled Backend Developer with strong expertise in Node.js, TypeScript, and REST API development, along with hands-on experience in payment gateway integrations and Azure cloud services. The ideal candidate will be responsible for building scalable, secure backend systems and managing end-to-end payment processing workflows. Required Skills: Strong proficiency in Node.js, Express.js / NestJS, and TypeScript Expertise in REST API design and microservices architecture Hands-on experience with payment gateway integration and payment processing systems Strong knowledge of API security standards Experience with Azure cloud services Familiarity with Docker and Kubernetes Good understanding of system design and scalability Qualifications Bachelor's degree in Computer Science, Engineering, or a related field Roles & Responsibilities Design, develop, and maintain scalable backend systems using Node.js, Express.js / NestJS, and TypeScript Build and optimize secure, high-performance REST APIs Leverage AI tools such as GitHub Copilot and ChatGPT to enhance development efficiency and code quality Integrate and manage payment gateways including Credit/Debit Cards, Wallets, UPI, QR, and POS systems Handle complete payment lifecycle: authorization, settlement, reconciliation, refunds, and chargebacks Implement secure API authentication and authorization mechanisms (OAuth 2.0, JWT, HTTPS headers, OCSP stapling) Develop and deploy applications on Azure cloud platform using services like Azure DevOps, Functions, Cosmos DB, Azure SQL, Redis, Event Hub, and Service Bus Work with containerization tools such as Docker and Kubernetes Integrate with external and internal systems using JSON/XML-based APIs Collaborate with cross-functional teams to translate business requirements into technical solutions Act as a technical mentor/consultant and contribute to architectural decisions