Node.js Developer

Description :Key Responsibilities :

• Backend Development & Architecture :

• Design and develop scalable backend services using Node.js.

• Build microservices for telephony, call routing, ACD, WebRTC signaling, IVR workflows, message queues, and real-time events.

• Implement RESTful APIs, WebSocket-based services, and internal service-to-service communication.

• Real-Time Processing (Telephony) :

• Work on telephony-related modules :

• Call logs flow

• ACD engine

• WebRTC signaling

• Real-time call events

• Agent state transitions

• Event-driven routing systems

• Optimize latency and concurrency for real-time voice systems.

• Data Handling & Optimization :

• Build and optimize Elasticsearch queries (aggregation, nested, scroll, bulk, time-series handling).

• Work with MongoDB for high-volume document operations.

• Implement caching layers using Redis, TTL strategies, and pub/sub patterns.

• Handle millions of records efficiently with optimized indexing & data models.

• Queues, Streaming & Event-Driven Architecture :

• Implement and manage high-throughput queues using RabbitMQ or Kafka.

• Build producers/consumers for telephony workflows (call events, call states, CDR processing, agent events).

• Interprocess Communication (IPC) & System Programming :

• Implement multi-process Node.js apps (cluster mode, worker threads, child processes).

• Strong hold on OS concepts: file descriptors, sockets, event loops, buffers, concurrency models.

• Write efficient socket-based programs for internal signaling.

• Performance, Reliability & Scalability :

• Optimize code for low latency & high throughput.

• Build retry handling, persistence queues, circuit breakers, and fail-safe mechanisms.

• Work on large-scale log processing pipelines.

• Telephony Domain Responsibilities :

• Understand call flows, SIP/WebRTC basics (optional but preferred).

• Work on modules like call routing, IVR, call state machine, events pipeline.

• Collaborate with telephony/VoIP teams for API integrations.

• Monitoring, Debugging & DevOps Collaboration :

• Work with DevOps for CI/CD, scaling microservices, and containerization (Docker).

Required Skills & Qualifications :Core Technical Skills :

• Node.js (3+ years) with strong fundamentals (events, async, memory, cluster, streams).

• Elasticsearch (indexing, nested fields, aggregations, time-series queries).

• MongoDB (schema design, indexing, pipelines).

• Redis (cache, pub/sub, streams).

• RabbitMQ / Kafka (message queues, routing, consumer groups).

• WebSockets & real-time event systems.

• IPC, socket programming, networking basics.

• Excellent command over algorithms, patterns, data structures, and backend architecture.

Must-Have Knowledge Areas :

• Event-driven systems.

• API performance optimization.

• Large-scale data handling.

• Fault-tolerant distributed systems.

• High-concurrency systems.

• Memory management and Node.js internals.

• Working with large JSON data, micro-batching, and queue-based processing.