Job Description: Backend Developer (VoIP & Asterisk Focus)

Company: Clixxo Broadband Private Limited

Location: Noida, Uttar Pradesh

Department: Product Development

Employment Type: Full-Time

About Clixxo

Founded in 2003, Clixxo Broadband Pvt. Ltd., is a leading provider of innovative voice, video, and data communication solutions across India. As a significant system manufacturer and integrator within the telecommunications sector, we proudly serve over 1,400 clients, delivering advanced IP-PBX systems, telecommunications equipment, and enterprise-grade solutions.

Clixxo is an ISO 9001:2015, ISO 14001:2015, and ISO/IEC 27001:2022 certified entity, reflecting our unwavering commitment to quality, environmental responsibility, and information security. We are also TEC certified and a registered OEM on GeM. Join our team in Noida and contribute to the development of cutting-edge communication solutions that empower businesses nationwide.

Role Overview

We are looking for a Backend Developer who bridges the gap between robust server-side logic and real-time communication protocols. In this role, you will be responsible for developing scalable backend services while integrating and optimizing VoIP functionalities using Asterisk.

The ideal candidate is someone who enjoys solving complex architectural challenges and has a foundational understanding of how voice traffic moves across IP networks.

Key Responsibilities

Backend Development: Design, build, and maintain efficient, reusable, and reliable code for server-side applications.
VoIP Integration: Configure and manage Asterisk PBX instances, including dialplan development, AGI scripting, and AMI integration.
API Management: Develop and consume RESTful APIs to connect telephony services with web and mobile interfaces.
Database Optimization: Design schema and optimize queries for high-concurrency systems, ensuring data integrity and low latency.
System Performance: Monitor and tune backend performance, specifically focusing on reducing jitter and latency for real-time voice applications.
Security: Implement industry-standard security protocols for both data storage and SIP signaling (TLS/SRTP).

Required Skills & Qualifications

Programming: Proficiency in at least one major backend language (e.g., Java,Go, Node.js, or C++).
Telephony Fundamentals: Hands-on experience or solid theoretical knowledge of SIP, RTP, and WebRTC protocols.
Asterisk Expertise: Experience with Asterisk configuration, including PJSIP, call routing logic, and troubleshooting via CLI.
Database Systems: Experience with SQL (PostgreSQL/MySQL) and NoSQL (Redis/MongoDB) databases. MySQL will be added advantage.
Linux/DevOps: Comfortable working in a Linux environment; experience with Docker or Kubernetes for deploying microservices is a plus.
Version Control: Strong command of Git and collaborative CI/CD workflows.

Preferred Qualifications

Experience with other communication frameworks like FreeSWITCH or Kamailio.
Knowledge of cloud platforms (AWS, Google Cloud, or Azure) specifically regarding networking and load balancing for VoIP.
Understanding of billing systems or CDR (Call Detail Record) processing.

What We Offer

Opportunity to work on cutting-edge communication technology.
Competitive salary and benefits package.
A collaborative environment that values continuous learning and technical ownership.

How to Apply: Please send your resume and a brief cover letter outlining your experience with Tally-based inventory management to [HIDDEN TEXT]

Back End Developer - VoIP