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Senior Software Engineer - MERN Stack

at Relanto

Bengaluru, India Senior Posted 2026-04-01

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About this role

Role Overview: We are looking for a senior full-stack developer with strong expertise in building and managing API integrations at scale. This is a full-stack role involving both backend service development and frontend application development, with a strong focus on scalable systems and API integrations. Key Responsibilities: Design and develop scalable backend services using Node.js. Build and maintain RESTful APIs and integration layers with external systems. Develop frontend applications using React.js (or TypeScript-based frameworks). Own end-to-end feature development across backend and frontend. Design and implement API integrations with third-party platforms and internal services. Handle webhooks, event-driven architectures, and async processing. Ensure security, authentication (OAuth/JWT), and data protection. Implement logging, monitoring, and performance optimization. Work closely with product, QA, and DevOps teams for delivery. Mentor junior developers and drive engineering best practices. Required Skills: Core Stack 8+ years of software development experience Strong expertise in Node.js (must-have) Hands-on experience with React.js or TypeScript-based frontend frameworks Strong proficiency in JavaScript / TypeScript API & Integration Proven experience designing and implementing REST APIs Strong experience with third-party API integrations Hands-on experience with: Webhooks / event-driven systems Rate limiting, retries, and fault tolerance Data transformation between systems Experience working with external platforms (payments, SaaS tools, enterprise systems, etc.) Backend Engineering Strong understanding of asynchronous programming and event-driven architecture Experience with database design (MongoDB or other NoSQL/SQL) Ability to build scalable, high-performance services Security Strong understanding of OAuth 2.0 JWT-based authentication Secure API design and data handling Cloud & DevOps Experience with AWS / Azure / GCP Familiarity with CI/CD pipelines Experience with logging, monitoring, and observability tools

How to get this job at Relanto

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