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

**Job Title:** Backend Developer

**Experience:** 2–5 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 expertise in Node.js, TypeScript, real-time communication, and scalable backend systems. The candidate should have hands-on experience with WebRTC video calling, databases, cloud deployment, DevOps, payment gateways, bulk/OTP SMS, and WhatsApp integrations.

## Key Responsibilities

- Develop, maintain, and optimize scalable backend applications using Node.js, TypeScript, and REST APIs.

- Build real-time communication features using WebRTC, Socket.IO, and WebSockets, including signaling servers and video call management.

- Design and optimize MongoDB schemas, queries, indexes, and data models.

- Implement Redis for caching, session management, real-time state, and background jobs.

- Containerize applications using Docker and deploy them on cloud platforms.

- Manage application logging, monitoring, error tracking, testing, debugging, and performance optimization.

- Integrate payment gateways, including payment processing, webhooks, transaction verification, and refunds.

- Integrate bulk SMS, OTP SMS, and WhatsApp Business API for authentication, notifications, and automated messaging.

- Implement secure authentication, authorization, API protection, and data validation.

- Collaborate with frontend, QA, DevOps, and product teams; maintain documentation and troubleshoot production issues.

## Required Technical Skills

**1. Backend Development**

- Node.js, TypeScript, and JavaScript

- Express.js, NestJS, or similar frameworks

- REST APIs, third-party integrations, JWT, and OAuth

**2. WebRTC & Real-Time Communication**

- WebRTC implementation and signaling servers





- Socket.IO and WebSockets

- STUN/TURN concepts, call management, and connection troubleshooting

**3. Databases & Caching**

- MongoDB schema design, indexing, and query optimization

- Redis for caching, sessions, queues, and real-time state

**4. DevOps & Cloud Deployment**

- Docker, CI/CD, and cloud platforms such as AWS, Azure, or Google Cloud

- Linux server administration, Nginx, reverse proxies, SSL/TLS, and domain configuration

- Networking, scaling, and production troubleshooting

**5. Logging, Monitoring & Testing**

- Structured logging, metrics, monitoring, alerting, and error handling

- Unit, integration, and API testing using Postman or similar tools

- Debugging and performance profiling

**6. Third-Party Integrations**

- Payment gateways such as Razorpay, Cashfree, Stripe, or equivalent

- Bulk SMS and OTP SMS gateways

- WhatsApp Business Platform / Cloud API

- Webhooks, delivery reports, retries, and failure handling

- Email and push notifications, where required

**7. Security & Performance**

- Secure APIs, input validation, rate limiting, and protection against common vulnerabilities

- Secrets management, scalable architecture, and effective resource utilization

## Preferred Qualifications

- Bachelor's degree in Computer Science, IT, or equivalent practical experience.

- 2–5 years of professional backend development experience.

- Experience with production-grade video calling or real-time communication applications.

- Familiarity with coturn, message queues, background jobs, load balancing, horizontal scaling, and distributed systems.

- Ability to troubleshoot production applications and cloud infrastructure.

## Key Expectations

Independently develop backend services, integrate third-party APIs, manage databases, deploy applications, resolve production issues, and build secure, reliable, and scalable communication systems.

Pay: ₹349,000.00 - ₹1,660,000.00 per year

Work Location: Remote

📌 Backend Developer (India)
🏢 SAN LAK SERVICES PRIVATE
📍 India