Backend Developer

Job Description: Backend Developer (Node.js & TypeScript)

Job Title: Backend Developer
Experience: ~5 Years (Preferred)
Employment Type: Full-Time
Department: Technology / Engineering
Work Mode: As per company requirements

About the Role

We are looking for a skilled Backend Developer with strong expertise in Node.js and TypeScript to design, develop, deploy, and maintain scalable backend systems and real-time communication applications.

The ideal candidate should have hands-on experience with WebRTC-based video calling software, Socket.IO/WebSockets, database management, cloud deployment, payment gateway integration, and third-party messaging services, including bulk SMS, OTP SMS, and WhatsApp Business API.

Key Responsibilities

• Design, develop, and maintain scalable backend applications using Node.js and TypeScript.
• Build RESTful APIs and integrate third-party services.
• Develop real-time communication features using WebRTC, Socket.IO, and WebSockets.
• Work on video calling software, including signaling servers, call management, and media session coordination.
• Design and optimize database schemas, queries, and data models using MongoDB.
• Implement Redis for caching, session management, real-time state, and background job processing.
• Containerize applications using Docker and manage deployment on cloud platforms.
• Implement logging, monitoring, error tracking, debugging, and application performance optimization.
• Write unit tests, integration tests, and API tests to ensure application reliability.
• Integrate payment gateways, including payment processing, webhooks, transaction verification, and refund workflows.
• Integrate bulk SMS and OTP SMS gateways for authentication, notifications, and transactional messaging.
• Integrate WhatsApp Business API or approved WhatsApp messaging providers for automated notifications and communication.
• Collaborate with frontend developers, QA engineers, DevOps engineers, and product teams.
• Follow security best practices, including authentication, authorization, API protection, data validation, and secure handling of sensitive information.
• Maintain technical documentation and troubleshoot production issues.

Required Technical Skills

1. Backend Development

• Node.js
• TypeScript and JavaScript
• Express.js, NestJS, or similar backend frameworks
• REST APIs and API integration
• Authentication and authorization using JWT, OAuth, or equivalent methods

2. Real-Time Communication

• WebRTC fundamentals and implementation
• Socket.IO and WebSockets
• Signaling server development
• STUN/TURN server concepts and configuration
• Real-time event handling and connection management
• Video calling architecture and troubleshooting

3. Database and Caching

• MongoDB, schema design, indexing, and query optimization
• Redis for caching, sessions, queues, and real-time state management
• Database performance optimization and data consistency

4. DevOps and Cloud Deployment

• Docker and containerization
• CI/CD pipeline fundamentals
• Deployment on AWS, Google Cloud, Azure, or similar platforms
• Linux server administration and environment configuration
• Nginx, reverse proxies, SSL/TLS, and domain configuration
• Basic networking, scaling, and production troubleshooting

5. Logging, Monitoring, and Testing

• Structured logging and error handling
• Monitoring, metrics, and alerting
• Unit testing and integration testing
• API testing using Postman or similar tools
• Debugging, performance profiling, and production issue resolution

6. Third-Party Integrations

• Payment gateway integration, such as Razorpay, Cashfree, Stripe, or equivalent
• Bulk SMS and OTP SMS gateway integration
• WhatsApp Business Platform / Cloud API integration
• Webhooks, delivery reports, retries, and failure handling
• Email and push notification integrations, where required

7. Security and Performance

• Secure API development
• Rate limiting and abuse prevention
• Input validation and protection against common web vulnerabilities
• Secrets and environment variable management
• Scalable architecture and efficient resource utilization

Preferred Qualifications

• Bachelor’s degree in Computer Science, IT, or a related field, or equivalent practical experience.
• 2–5 years of professional backend development experience.
• Experience building production-grade video calling or real-time communication applications.
• Familiarity with TURN s…